SpringCloud1

2022/10/30 JavaSpringCloudEurekaZookeeper

# SpringCloud

# 版本选择

SpringBoot : 2.3.12.RELEASE

SpringCloud : Hoxton.SR12

SpringCloud alibaba : 2.2.7.RELEASE

java : 1.8.0_291

maven : 3.8.1

mysql : 5.7.36

[MindManager2020 64位 下载地址](http://dwnld.mindjet.com/stubs/Builds/MindManager2020/20_0_334/64Bit/MindManager 2020.msi)

[MindManager2020 32位 下载地址](http://dwnld.mindjet.com/stubs/Builds/MindManager2020/20_0_334/32Bit/MindManager 2020.msi)

激活码 : MP20-345-DP56-7778-919A

# 文章选择

consul + ribbon + openfeign + hystrix

gateway + config + bus + stream + sleuth

nacos + sentinel

Seata

# cloud 升级

# 服务注册中心

image-20220116102539381

对比

image-20220116102748121

# 服务调用

image-20220116102939916

image-20220116102953284

# 服务降级

image-20220116103131436

# 服务网关

image-20220116103240210

# 服务配置

image-20220116103327768

# 服务总线

image-20220116103348012

# 总结

image-20220116103429075

# 参考资料

springcloud官方文档 (opens new window)

springcloud中文文档 (opens new window)

springboot官方文档 (opens new window)

# 微服务架构编码构建

永远要记住

约定 > 配置 > 编码

# IDEA新建project工作空间

# New Project

image-20220116105427771

# 聚合总父工程名字

image-20220116105513052

# Maven 选版本

image-20220116105539979

# 字符编码

image-20220116104710647

# 注解生效激活

image-20220116104738936

# java编译版本选8

image-20220116105115222

# File Type过滤

image-20220116105244904

# 父工程 POM

# 添加 packing

<packaging>pom</packaging>
1

# 删除 src 目录

image-20220116110045969

# 修改 pom.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    
    <groupId>com.yixihan.springcloud</groupId>
    <artifactId>springcloud-learn</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <!-- 统一管理 jar 包版本 -->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>2.14.1</log4j.version>
        <lombok.version>1.18.22</lombok.version>
        <mysql.version>8.0.27</mysql.version>
        <druid.version>1.2.8</druid.version>
        <mybatis.spring.boot.version>2.2.0</mybatis.spring.boot.version>
    </properties>

    <!-- 子模块继承之后,提供作用:锁定版本 + 子 module 不用写 groupId 和version  -->
    <dependencyManagement>
        <dependencies>
            <!--spring boot 2.3.12.RELEASE -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.12.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud Hoxton.SR12 -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR12</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- spring cloud alibaba 2.2.7.RELEASE -->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.2.7.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- mysql connector -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>

            <!-- druid -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>

            <!-- springboot start-->
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis.spring.boot.version}</version>
            </dependency>

            <!-- 单元测试 -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>

            <!-- log4j -->
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>

            <!-- lombok -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <optional>true</optional>
            </dependency>
        </dependencies>
    </dependencyManagement>
    
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111

# DependencyManagement 和 Dependencies

dependencyManagement

Maven 使用 dependencyManagement 元素来提供了一种管理依赖版本号的方式。

通常会在一个组织或者项目的最顶层的父 POM 中看到 dependencyManagement 元素。

使用 pom.xml 中的 dependencyManagement 元素能让所有在子项目中引用一个依赖而不用显式的列出版本号。Maven 会沿着父子层次向上走,直到找到一个拥有dependencyManagement 元素的项目,然后它就会使用这个 dependencyManagement 元素中指定的版本号。

image-20220116140743537

image-20220116140758439

这样做的好处就是:如果有多个子项目都引用同一样依赖,则可以避免在每个使用的子项目里都声明一个版本号,这样当想升级或切换到另一个版本时,只需要在顶层父容器里更新,而不需要一个一个子项目的修改 ;另外如果某个子项目需要另外的一个版本,只需要声明 version 就可。

  • dependencyManagement 里只是声明依赖,==并不实现引入==,因此子项目需要显示的声明需要用的依赖。

  • 如果不在子项目中声明依赖,是不会从父项目中继承下来的;只有在子项目中写了该依赖项,并且没有指定具体版本,才会从父项目中继承该项,并且 version 和 scope 都读取自父 pom;

  • 如果子项目中指定了版本号,那么会使用子项目中指定的jar版本。

# maven中跳过单元测试

image-20220116141212362

# Rest微服务工程构建

图解

image-20220116141502917

# 微服务模块构建 - payment 模块

微服务模块构建步骤

  1. 建 module
  2. 改 POM
  3. 写 Yaml
  4. 主启动
  5. 业务类

# 建 module

module 名 : cloud-provider-payment8001

image-20220116142311218

image-20220116142443571

# 改 POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8001</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

# 写 yaml

server:
  port: 8001
spring:
  application:
    name: cloud-provider-service
  datasource:
    # 当前数据源操作类型
    type: com.alibaba.druid.pool.DruidDataSource
    # mysql 驱动包
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://175.24.229.41:1617/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: W6YnvKnLzpSFNGuc.

mybatis:
  mapper-locations: classpath:mapper/*.xml
  # 所有 pojo 别名类所在包
  type-aliases-package: com.yixihan.springcloud.pojo


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

# 主启动

package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:07
 */
@SpringBootApplication
public class PaymentMain8001 {

    public static void main(String[] args) {
        SpringApplication.run (PaymentMain8001.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

image-20220116150922986

# 业务类

图解

image-20220116151346921

# 建表 sql
CREATE DATABASE IF NOT EXISTS `springcloud`;

CREATE TABLE IF NOT EXISTS `payment`
(
    `id`     bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
    `serial` varchar(200) DEFAULT '',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8
1
2
3
4
5
6
7
8
# pojo

Payment

package com.yixihan.springcloud.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:18
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Payment implements Serializable {

    /**
     * id
     */
    private Long id;

    /**
     * 流水号
     */
    private String serial;

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
package com.yixihan.springcloud.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * Json 封装体
 * @author : yixihan
 * @create : 2022-01-16-15:19
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class CommonResult<T> {

    private Integer code;

    private String message;

    private T data;

    public CommonResult(Integer code, String message) {
        this.code = code;
        this.message = message;
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
# mapper

PaymentMapper.java

package com.yixihan.springcloud.mapper;

import com.yixihan.springcloud.pojo.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:23
 */
@Mapper
public interface PaymentMapper {

    /**
     * 创建一个订单对象
     * @param payment 订单对象
     * @return 订单对象
     */
    Integer create (Payment payment);


    /**
     * 根据 id 获取订单对象
     * @param id 订单 id
     * @return 订单对象
     */
    Payment getPaymentById (@Param ("id") Long id);
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

PaymentMapper.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.yixihan.springcloud.mapper.PaymentMapper">

    <!--useGeneratedKeys : 是否返回值-->
    <!--keyProperty : 主键-->
    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into springcloud.payment (serial)
        VALUES (#{serial});
    </insert>


    <resultMap id="BaseResultMap" type="Payment">
        <id property="id" column="id" jdbcType="BIGINT"/>
        <result property="serial" column="serial" jdbcType="VARCHAR"/>
    </resultMap>

    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        select *
        from springcloud.payment
        where id = #{id};
    </select>
</mapper>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
# service

PaymentService

package com.yixihan.springcloud.service;

import com.yixihan.springcloud.pojo.Payment;
import org.apache.ibatis.annotations.Param;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:37
 */
public interface PaymentService {

    /**
     * 创建一个订单对象
     * @param payment 订单对象
     * @return 订单对象
     */
    Integer create (Payment payment);


    /**
     * 根据 id 获取订单对象
     * @param id 订单 id
     * @return 订单对象
     */
    Payment getPaymentById (@Param("id") Long id);


}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

PaymentServiceImpl

package com.yixihan.springcloud.service;

import com.yixihan.springcloud.mapper.PaymentMapper;
import com.yixihan.springcloud.pojo.Payment;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:36
 */
@Service
public class PaymentServiceImpl implements PaymentService{

    @Resource
    private PaymentMapper paymentMapper;


    @Override
    public Integer create(Payment payment) {
        return paymentMapper.create (payment);
    }

    @Override
    public Payment getPaymentById(Long id) {
        return paymentMapper.getPaymentById (id);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
# controller
package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import com.yixihan.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:40
 */
@Slf4j
@RestController
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    /**
     * 小坑 : 要加 @RequestBody 这个注解
     */
    @PostMapping("/payment/create")
    public CommonResult<Integer> create(@RequestBody Payment payment) {

        Integer result = paymentService.create (payment);

        log.info ("****插入结果 : {}", result);

        return result > 0 ?
                new CommonResult<> (200, "插入成功", result) :
                new CommonResult<> (444, "插入失败", null);
    }

    @GetMapping("/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {

        Payment result = paymentService.getPaymentById (id);

        log.info ("****查询结果 : {}", result);

        return result != null ?
                new CommonResult<> (200, "查询成功", result) :
                new CommonResult<> (444, "没有对应记录, 查询 ID : " + id, null);
    }


}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

# 测试

预先插入一条记录

insert into springcloud.payment (serial) values ('张三');
1

image-20220116155443843

测试查询接口

测试查询接口 (opens new window)

http://localhost:8001/payment/get/id

image-20220116160642599

测试创建接口 (opens new window)

http://localhost:8001/payment/create

image-20220116160401065

image-20220116160659639

# 总结

就五步

  • 建 module
  • 改 POM
  • 写 YAML
  • 主启动
  • 业务类

# 热部署 Devtools

只允许在开发阶段使用

# Adding devtools to your project

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <scope>runtime</scope>
    <optional>true</optional>
</dependency>
1
2
3
4
5
6

# Adding plugin to your pom.xml

<build>
    <finalName>springcloud-learn</finalName>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>2.3.12.RELEASE</version>
            <configuration>
                <fork>true</fork>
                <addResources>true</addResources>
            </configuration>
        </plugin>
    </plugins>
</build>
1
2
3
4
5
6
7
8
9
10
11
12
13
14

# Enabling automatic build

image-20220116161729967

# Update the value of

image-20220116161922877

image-20220116162001534

# 重启IDEA

即可

# 微服务模块构建 - customer 模块

图解

image-20220116163738577

# 建 module

module 名 : cloud-consumer-order80

# 改 POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

# 写 YAML

server:
  port: 80
1
2

# 主启动

package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:31
 */
@SpringBootApplication
public class MainApp80 {

    public static void main(String[] args) {
        SpringApplication.run (MainApp80.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

# 业务类

# pojo

同模块 module - cloud-provider-payment8001

pojo 包里 Payment 和 CommonResult

# RestTemplate

RestTemplate 是什么

RestTemplate提供了多种便捷访问远程Http服务的方法, 是一种简单便捷的访问restful服务模板类,是Spring提供的用于访问Rest服务的客户端模板工具集

RestTemplate 官方 API 文档 (opens new window)

使用

使用restTemplate访问restful接口非常的简单粗暴无脑。

(url, requestMap, ResponseBean.class)这三个参数分别代表 REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。

# config配置类
package com.yixihan.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:47
 */
@Configuration
public class ApplicationContextConfig {

    @Bean("getRestTemplate")
    public RestTemplate getRestTemplate () {
        return new RestTemplate ();
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# controller
package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:36
 */
@RestController
@Slf4j
public class OrderController {

    public static final String PAYMENT_URL = "http://localhost:8001";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult create (Payment payment) {
        return restTemplate.postForObject (PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }


    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult getPayment (@PathVariable("id") Long id) {
        return restTemplate.getForObject (PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

# 测试

注意 : 开启两个服务需要开启 Run DashBoard(service 服务)

idea 会弹出提示, 同意即可

也可以通过修改 idea 的 workspace.xml 的方式来快速打开 Run Dashboard 窗口

workspace.xml 在项目 ./idea 目录下添加如下内容

<component name="RunDashboard">
    <option name="configurationTypes">
        <set>
            <option value="SpringBootApplicationConfigurationType" />
        </set>
    </option>
</component>
1
2
3
4
5
6
7

image-20220116175406722

或者使用快捷键 alt + 8

查询测试 (opens new window)

image-20220116165707822

插入测试 (opens new window)

若插入的值为 null, 则在 payment 模块内 create 函数 payment参数上加 @RequestBody 注解

image-20220116165747870

image-20220116174205571

# 工程重构

问题

系统中有重复部分,重构 (pojo)

# 微服务模块构建 - commons 模块

# 建 module

module 名 : cloud-api-commons

# 改 POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api-commons</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- hutu 工具包-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.1.0</version>
        </dependency>
    </dependencies>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
# pojo

同之前两个模块的 pojo 包

# 打包

执行 maven 指令 clean, install, 打包成可执行的 jar 包

image-20220116180952885

# 改造 Payment 模块 和 customer 模块

删除 pojo 类

修改 POM

新增如下内容 :

<!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
<dependency>
    <groupId>com.yixihan.springcloud</groupId>
    <artifactId>cloud-api-commons</artifactId>
    <version>${project.version}</version>
</dependency>
1
2
3
4
5
6

# Eureka 服务注册

# Eureka 基础知识

# 服务治理

Spring Cloud 封装了 Netflix 公司开发的 Eureka 模块来实现服务治理

在传统的rpc远程调用框架中,管理每个服务与服务之间依赖关系比较复杂,管理比较复杂,所以需要使用服务治理,管理服务于服务之间依赖关系,可以实现服务调用、负载均衡、容错等,实现服务发现与注册。

# 服务注册

Eureka采用了CS的设计架构,Eureka Server 作为服务注册功能的服务器,它是服务注册中心。而系统中的其他微服务,使用 Eureka的客户端连接到 Eureka Server并维持心跳连接。这样系统的维护人员就可以通过 Eureka Server 来监控系统中各个微服务是否正常运行。

在服务注册与发现中,有一个注册中心。当服务器启动的时候,会把当前自己服务器的信息 比如 服务地址通讯地址等以别名方式注册到注册中心上。另一方(消费者|服务提供者),以该别名的方式去注册中心上获取到实际的服务通讯地址,然后再实现本地RPC调用RPC远程调用框架核心设计思想:在于注册中心,因为使用注册中心管理每个服务与服务之间的一个依赖关系(服务治理概念)。在任何rpc远程框架中,都会有一个注册中心(存放服务地址相关信息(接口地址))

Eureka系统架构

image-20220117073320965

Dubbo的架构

image-20220117073332114

# Eureka两组件

Eureka Server

Eureka Server 提供服务注册服务

各个微服务节点通过配置启动后,会在EurekaServer中进行注册,这样EurekaServer中的服务注册表中将会存储所有可用服务节点的信息,服务节点的信息可以在界面中直观看到。

Eureka Client

EurekaClient 通过注册中心进行访问

是一个Java客户端,用于简化Eureka Server的交互,客户端同时也具备一个内置的、使用轮询(round-robin)负载算法的负载均衡器。在应用启动后,将会向Eureka Server发送心跳(默认周期为30秒)。如果Eureka Server在多个心跳周期内没有接收到某个节点的心跳,EurekaServer将会从服务注册表中把这个服务节点移除(默认90秒)

# 单机Eureka构建

图解

image-20220117073745234

# 单机Eureka构建步骤

# 建 module

module 名 : cloud-eureka-server7001

# 改 POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-eureka-server7001</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--eureka-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.yixihan.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--boot web actuator-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--一般通用配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
    </dependencies>


</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
# 写 YAML
server:
  port: 7001

eureka:
  instance:
    # eureka 服务端的实例名称
    hostname: localhost
  client:
    # false 表示不向注册中心注册自己
    register-with-eureka: false
    # false 表示自己端就是注册中心, 职责就是维护服务实例, 并不需要去检索服务
    fetch-registry: false
    service-url:
      # 设置与 Eureka Server 交互的地址查询服务和注册服务都需要依赖这个地址
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * @author : yixihan
 * @create : 2022-01-17-7:47
 */
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 {

    public static void main(String[] args) {
        SpringApplication.run (EurekaMain7001.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 测试

Eureka 控制台 (opens new window)

image-20220117075257434

# payment8001 模块注册进 EurekaServer

# 改 POM

新增内容

<!--eureka-client-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
1
2
3
4
5
# 写 YAML
eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka
1
2
3
4
5
6
7
8
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:07
 */
@SpringBootApplication
@EnableEurekaClient
public class PaymentMain8001 {

    public static void main(String[] args) {
        SpringApplication.run (PaymentMain8001.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 测试

ps : 先要启动EurekaServer

Eureka 控制台 (opens new window)

image-20220117080453916

微服务注册名配置说明

image-20220117080605519

# Eureka 自我保护机制 (后面会解决)

Eureka 控制台上面的红字警告即 Eureka 自我保护机制的一种体现

默认情况下,如果Eureka Server在一定时间内(默认90秒)没有接收到某个微服务实例的心跳,Eureka Server将会移除该实例。但是当网络分区故障发生时,微服务与Eureka Server之间无法正常通信,而微服务本身是正常运行的,此时不应该移除这个微服务,所以引入了自我保护机制。

自我保护模式正是一种针对网络异常波动的安全保护措施,使用自我保护模式能使Eureka集群更加的健壮、稳定的运行。

自我保护机制的工作机制是如果在15分钟内超过85%的客户端节点都没有正常的心跳,那么Eureka就认为客户端与注册中心出现了网络故障,Eureka Server自动进入自我保护机制

自我保护机制时会出现以下几种情况

  1. Eureka Server不再从注册列表中移除因为长时间没收到心跳而应该过期的服务
  2. Eureka Server仍然能够接受新服务的注册和查询请求,但是不会被同步到其它节点上,保证当前节点依然可用
  3. 当网络稳定时,当前Eureka Server新的注册信息会被同步到其它节点中

解决建议

  • 在生产上可以开自注册,部署两个server

  • 在本机器上测试的时候,可以把比值调低,比如0.49

  • 把自我保护模式关闭

    eureka:
    	server:
    		enableSelfPreservation: false
    
    1
    2
    3

# order80 模块注册进 EurekaServer

# 改 POM

新增内容

<!--eureka-client-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
1
2
3
4
5
# 写 YAML
spring:
  application:
    name: cloud-order-service

eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka
1
2
3
4
5
6
7
8
9
10
11
12
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:31
 */
@SpringBootApplication
@EnableEurekaClient
public class MainApp80 {

    public static void main(String[] args) {
        SpringApplication.run (MainApp80.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 测试

ps : 先要启动EurekaServer

Eureka 控制台 (opens new window)

测试接口 (opens new window)

控制台页面

image-20220117081427042

测试接口

image-20220117081454831

# 集群Eureka构建

# Eureka集群原理说明

原理图

image-20220117081827677

微服务RPC远程服务调用最核心的是什么

高可用,试想你的注册中心只有一个only one, 它出故障了那就呵呵( ̄▽ ̄)"了,会导致整个为服务环境不可用

解决办法:搭建Eureka注册中心集群 ,实现负载均衡+故障容错

图解

image-20220117085813278

EurekaServer集群环境构建步骤

# EurekaServer集群环境构建步骤

# 建 module

module 名 : cloud-eureka-server7002

# 改 POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-eureka-server7002</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--eureka-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.yixihan.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--boot web actuator-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--一般通用配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
    </dependencies>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
# 修改映射配置

文件目录

修改映射配置添加进hosts文件

# springcloud 学习
127.0.0.1 eureka7001.com
127.0.0.1 eureka7002.com
127.0.0.1 eureka7003.com
1
2
3
4

image-20220117082706756

# 写 YAML

单机 eureka 配置

server:
  port: 7001

eureka:
  instance:
    hostname: localhost #eureka服务端的实例名称
  client:
    #false表示不向注册中心注册自己。
    register-with-eureka: false
    #false表示自己端就是注册中心,我的职责就是维护服务实例,并不需要去检索服务
    fetch-registry: false
    service-url:
    #设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ 
1
2
3
4
5
6
7
8
9
10
11
12
13
14

集群 eureka 配置

7001

server:
  port: 7001

eureka:
  instance:
    # eureka 服务端的实例名称
    hostname: eureka7001.com
  client:
    # false 表示不向注册中心注册自己。
    register-with-eureka: false
    # false 表示自己端就是注册中心,我的职责就是维护服务实例,并不需要去检索服务
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7002.com:7002/eureka/

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

7002

server:
  port: 7002

eureka:
  instance:
    # eureka 服务端的实例名称
    hostname: eureka7002.com
  client:
    # false 表示不向注册中心注册自己。
    register-with-eureka: false
    # false 表示自己端就是注册中心,我的职责就是维护服务实例,并不需要去检索服务
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
1
2
3
4
5
6
7
8
9
10
11
12
13
14
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * @author : yixihan
 * @create : 2022-01-17-8:29
 */
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7002 {

    public static void main(String[] args) {
        SpringApplication.run (EurekaMain7002.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 测试

eureka 7001 控制台 (opens new window)

eureka 7002 控制台 (opens new window)

控制台页面

image-20220117084710150

image-20220117084652670

出现图中所示, 即可证明 eureka 集群搭建成功

# 将 payment8001 微服务发布到Eureka集群配置中

改 yaml - eureka

server:
  port: 8001
spring:
  application:
    name: cloud-provider-service
  datasource:
    # 当前数据源操作类型
    type: com.alibaba.druid.pool.DruidDataSource
    # mysql 驱动包
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://175.24.229.41:1617/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: W6YnvKnLzpSFNGuc.

mybatis:
  mapper-locations: classpath:mapper/*.xml
  # 所有 pojo 别名类所在包
  type-aliases-package: com.yixihan.springcloud.pojo

eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      # 单机版
      # defaultZone: http://localhost:7001/eureka
      # 集群版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

# 将 order80 微服务发布到Eureka集群配置中

改 yaml - eureka

server:
  port: 80

spring:
  application:
    name: cloud-order-service

eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      # 单机版
      # defaultZone: http://localhost:7001/eureka
      # 集群版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

# 测试 eureka 集群

ps : 要先启动 eureka server, 再启动服务提供者 8001. 最后启动消费者 80

eureka 7001 控制台 (opens new window)

eureka 7002 控制台 (opens new window)

测试接口 (opens new window)

控制台页面

image-20220117085504357

image-20220117085522326

接口测试

image-20220117085539832

# payment 8001 集群环境构建

# 建 module

module 名 : cloud-provider-payment8002

# 改 POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8002</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.yixihan.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
    </dependencies>
    
</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
# 写 YAML
server:
  port: 8002

spring:
  application:
    name: cloud-payment-service
  datasource:
    # 当前数据源操作类型
    type: com.alibaba.druid.pool.DruidDataSource
    # mysql 驱动包
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://175.24.229.41:1617/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: W6YnvKnLzpSFNGuc.

mybatis:
  mapper-locations: classpath:mapper/*.xml
  # 所有 pojo 别名类所在包
  type-aliases-package: com.yixihan.springcloud.pojo

eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      # 单机版
      # defaultZone: http://localhost:7001/eureka
      # 集群版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @author : yixihan
 * @create : 2022-01-17-9:03
 */
@SpringBootApplication
@EnableEurekaClient
public class PaymentMain8002 {

    public static void main(String[] args) {
        SpringApplication.run (PaymentMain8002.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 业务类

同 payment 8001

# 修改 8001/8002 的 controller
package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import com.yixihan.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:40
 */
@Slf4j
@RestController
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @Value("${server.port}")
    private String serverPort;

    /**
     * 小坑 : 要加 @RequestBody 这个注解
     */
    @PostMapping("/payment/create")
    public CommonResult<Integer> create(@RequestBody Payment payment) {

        Integer result = paymentService.create (payment);

        log.info ("****插入结果 : {}", result);

        return result > 0 ?
                new CommonResult<> (200, "插入成功, serverPort : " + serverPort, result) :
                new CommonResult<> (444, "插入失败, serverPort : " + serverPort, null);
    }

    @GetMapping("/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {

        Payment result = paymentService.getPaymentById (id);

        log.info ("****查询结果 : {}", result);

        return result != null ?
                new CommonResult<> (200, "查询成功, serverPort : " + serverPort, result) :
                new CommonResult<> (444, "没有对应记录, 查询 ID : " + id + ", serverPort : " + serverPort, null);
    }


}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

# 负载均衡

图解

image-20220117092342579

# 修改 order 80 代码

controller

package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:36
 */
@RestController
@Slf4j
public class OrderController {

//    public static final String PAYMENT_URL = "http://localhost:8001";
    /**
     * localhost:8001 -> 微服务名, 即 eureka 控制台上显示的名字 (CLOUD-PAYMENT-SERVICE)
     */
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create (Payment payment) {
        return restTemplate.postForObject (PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }


    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment (@PathVariable("id") Long id) {
        return restTemplate.getForObject (PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

config

package com.yixihan.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:47
 */
@Configuration
public class ApplicationContextConfig {

    /**
     * 使用 @LoadBalanced 注解赋予 RestTemplate 负载均衡的能力
     */
    @Bean("getRestTemplate")
    @LoadBalanced
    public RestTemplate getRestTemplate () {
        return new RestTemplate ();
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

# 测试 payment 集群

ps : 先启动 eureka server 7001/7002, 再启动服务提供者 8001/8002, 最后启动消费者 80

eureka 7001 控制台 (opens new window)

eureka 7002 控制台 (opens new window)

测试接口 (opens new window)

eureka 控制台

image-20220117093232742

接口测试

image-20220117093258050

image-20220117093306016

Ribbon和Eureka整合后Consumer可以直接调用服务而不用再关心地址和端口号,且该服务还有负载功能了。O(∩_∩)O

# actuator微服务信息完善

# 主机名称:服务名称修改

当前问题

image-20220117093616157

# 修改 YAML 文件
eureka:
  instance:
    # 主机名称 : 服务名称修改
    instance-id: order80
1
2
3
4

# 访问信息有IP信息提示

当前问题

image-20220117094333350

# 修改 YAML 文件
eureka:
  instance:
	# 访问路径可以显示 IP 地址
    prefer-ip-address: true
1
2
3
4

# 测试

image-20220117094430958

# 服务发现Discovery

对于注册进eureka里面的微服务,可以通过服务发现来获得该服务的信息

# 修改 payment controller

package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import com.yixihan.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author : yixihan
 * @create : 2022-01-16-15:40
 */
@Slf4j
@RestController
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @Value("${server.port}")
    private String serverPort;

    @Resource
    private DiscoveryClient discoveryClient;

    /**
     * 小坑 : 要加 @RequestBody 这个注解
     */
    @PostMapping("/payment/create")
    public CommonResult<Integer> create(@RequestBody Payment payment) {

        Integer result = paymentService.create (payment);

        log.info ("****插入结果 : {}", result);

        return result > 0 ?
                new CommonResult<> (200, "插入成功, serverPort : " + serverPort, result) :
                new CommonResult<> (444, "插入失败, serverPort : " + serverPort, null);
    }

    @GetMapping("/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {

        Payment result = paymentService.getPaymentById (id);

        log.info ("****查询结果 : {}", result);

        return result != null ?
                new CommonResult<> (200, "查询成功, serverPort : " + serverPort, result) :
                new CommonResult<> (444, "没有对应记录, 查询 ID : " + id + ", serverPort : " + serverPort, null);
    }

    @GetMapping ("/payment/getService")
    public CommonResult<List<String>> getServices () {
        List<String> services = discoveryClient.getServices ();

        for (String element : services) {
            System.out.println(element);
        }

        return new CommonResult<> (200, "获取 services 信息成功", services);
    }

    @GetMapping ("/payment/getInstances")
    public CommonResult<List<ServiceInstance>> getInstances () {
        List<ServiceInstance> instances = discoveryClient.getInstances ("CLOUD-PAYMENT-SERVICE");

        for (ServiceInstance element : instances) {
            System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
                    + element.getUri());
        }


        return new CommonResult<> (200, "获取 instances 信息成功", instances);
    }

    @GetMapping ("/payment/getDiscovery")
    public CommonResult<DiscoveryClient> getDiscovery () {

        List<String> services = discoveryClient.getServices ();

        for (String element : services) {
            System.out.println(element);
        }

        List<ServiceInstance> instances = discoveryClient.getInstances ("CLOUD-PAYMENT-SERVICE");

        for (ServiceInstance element : instances) {
            System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
                    + element.getUri());
        }


        return new CommonResult<> (200, "获取 discovery 信息成功", discoveryClient);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103

# 修改 payment 主启动类

package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * 注解 @EnableDiscoveryClient => 开启服务发现
 * @author : yixihan
 * @create : 2022-01-17-9:03
 */
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class PaymentMain8002 {

    public static void main(String[] args) {
        SpringApplication.run (PaymentMain8002.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

# 修改 order controller

package com.yixihan.springcloud.controller;

import com.yixihan.springcloud.pojo.CommonResult;
import com.yixihan.springcloud.pojo.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author : yixihan
 * @create : 2022-01-16-16:36
 */
@RestController
@Slf4j
@RequestMapping("/consumer")
public class OrderController {

//    public static final String PAYMENT_URL = "http://localhost:8001";
    /**
     * localhost:8001 -> 微服务名, 即 eureka 控制台上显示的名字 (CLOUD-PAYMENT-SERVICE)
     */
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/payment/create")
    public CommonResult<Payment> create (Payment payment) {
        return restTemplate.postForObject (PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }


    @GetMapping("/payment/get/{id}")
    public CommonResult<Payment> getPayment (@PathVariable("id") Long id) {
        return restTemplate.getForObject (PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }

    @GetMapping ("/payment/getService")
    public CommonResult<List<String>> getServices () {

        return restTemplate.getForObject (PAYMENT_URL + "/payment/getService", CommonResult.class);
    }

    @GetMapping ("/payment/getInstances")
    public CommonResult<List<ServiceInstance>> getInstances () {

        return restTemplate.getForObject (PAYMENT_URL + "/payment/getInstances", CommonResult.class);
    }

    @GetMapping ("/payment/getDiscovery")
    public CommonResult<DiscoveryClient> getDiscovery () {
        return restTemplate.getForObject (PAYMENT_URL + "/payment/getDiscovery", CommonResult.class);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

# 测试

测试url (opens new window)

log 信息

image-20220117101148808

游览器信息

image-20220117101129312

# eureka 自我保护

# 故障现象

保护模式主要用于一组客户端和Eureka Server之间存在网络分区场景下的保护。一旦进入保护模式,Eureka Server将会尝试保护其服务注册表中的信息,不再删除服务注册表中的数据,也就是不会注销任何微服务。

如果在Eureka Server的首页看到以下这段提示,则说明Eureka进入了保护模式: EMERGENCY! EUREKA MAY BE INCORRECTLY CLAIMING INSTANCES ARE UP WHEN THEY'RE NOT. RENEWALS ARE LESSER THAN THRESHOLD AND HENCE THE INSTANCES ARE NOT BEING EXPIRED JUST TO BE SAFE

image-20220117101335227

# 导致原因

为什么会产生Eureka自我保护机制?

为了防止EurekaClient可以正常运行,但是 与 EurekaServer网络不通情况下,EurekaServer不会立刻将EurekaClient服务剔除

什么是自我保护模式?

默认情况下,如果EurekaServer在一定时间内没有接收到某个微服务实例的心跳,EurekaServer将会注销该实例(默认90秒)。但是当网络分区故障发生(延时、卡顿、拥挤)时,微服务与EurekaServer之间无法正常通信,以上行为可能变得非常危险了——因为微服务本身其实是健康的,此时本不应该注销这个微服务。Eureka通过“自我保护模式”来解决这个问题——当EurekaServer节点在短时间内丢失过多客户端时(可能发生了网络分区故障),那么这个节点就会进入自我保护模式。

image-20220117101506418

在自我保护模式中,Eureka Server会保护服务注册表中的信息,不再注销任何服务实例。

==一句话讲解:好死不如赖活着==

综上,自我保护模式是一种应对网络异常的安全保护措施。它的架构哲学是宁可同时保留所有微服务(健康的微服务和不健康的微服务都会保留)也不盲目注销任何健康的微服务。使用自我保护模式,可以让Eureka集群更加的健壮、稳定。

# 禁止自我保护

出厂默认,自我保护机制是开启的

# 注册中心 eureka server 端
eureka:
  instance:
    # eureka 服务端的实例名称
    hostname: eureka7002.com
  client:
    # false 表示不向注册中心注册自己。
    register-with-eureka: false
    # false 表示自己端就是注册中心,我的职责就是维护服务实例,并不需要去检索服务
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
  server:
    # 关闭自我保护机制,保证不可用服务被及时踢除
    enable-self-preservation: false
    # 最长等待时间
    eviction-interval-timer-in-ms: 2000
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
# 生产者消费者客户 eureka client 端
eureka:
  client:
    # 表示是否将自己注册进 EurekaServer 默认为 true
    register-with-eureka: true
    # 是否从 EurekaServer 抓取已有的注册信息,默认为 true. 单节点无所谓,集群必须设置为 true 才能配合 ribbon 使用负载均衡
    fetch-registry: true
    service-url:
      # 单机版
      # defaultZone: http://localhost:7001/eureka
      # 集群版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
  instance:
    # 主机名称 : 服务名称修改
    instance-id: payment8001
    # 访问路径可以显示 IP 地址
    prefer-ip-address: true
    # Eureka 客户端向服务端发送心跳的时间间隔,单位为秒(默认是30秒)
    lease-expiration-duration-in-seconds: 1
    # Eureka服务端在收到最后一次心跳后等待时间上限,单位为秒(默认是90秒),超时将剔除服务
    lease-renewal-interval-in-seconds: 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

# Zookeeper 服务注册

Eureka停止更新了你怎么办

官网说明 (opens new window)

解决方法之一 : SpringCloud整合Zookeeper代替Eureka

图解

image-20220117103602963

# 注册中心 Zookeeper 简述

zookeeper是一个分布式协调工具,可以实现注册中心功能

关闭Linux服务器防火墙后启动zookeeper服务器

zookeeper服务器取代Eureka服务器,zk作为服务注册中心

# 服务提供者

# 微服务模块构建

# 建module

module 名 : cloud-provider-payment8004

# 改POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8004</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
		<!-- zookeeper -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        </dependency>
        <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.yixihan.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--mysql-connector-java-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
    </dependencies>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
# 写YAML
server:
  port: 8004

# 需要写数据库配置, 不然会报错
spring:
  application:
    # 服务别名----注册 zookeeper 到注册中心名称
    name: cloud-provider-payment
  cloud:
    zookeeper:
      # zookeeper 主机 : 端口号
      connect-string: 175.24.229.41:2181
  datasource:
    # 当前数据源操作类型
    type: com.alibaba.druid.pool.DruidDataSource
    # mysql 驱动包
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://175.24.229.41:1617/springcloud?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: W6YnvKnLzpSFNGuc.

mybatis:
  mapper-locations: classpath:mapper/*.xml
  # 所有 pojo 别名类所在包
  type-aliases-package: com.yixihan.springcloud.pojo
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
# 主启动
package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author : yixihan
 * @create : 2022-01-17-14:17
 */
@SpringBootApplication
@EnableDiscoveryClient
public class Payment8004 {

    public static void main(String[] args) {
        SpringApplication.run (Payment8004.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
# 业务类

controller

package com.yixihan.springcloud.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;

/**
 * @author : yixihan
 * @create : 2022-01-17-14:18
 */
@RestController
@Slf4j
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @RequestMapping(value = "/payment/zk")
    public String paymentZk() {
        return "springcloud with zookeeper: "+serverPort+"\t"+ UUID.randomUUID().toString();
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

# 测试

启动后有有概率出现的问题

  1. 未配置数据库连接

  2. 服务器 Zookeeper 版本与导入的 Zookeeper 版本不一致 解决方法 :

    <!-- SpringBoot整合zookeeper客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        <!--先排除自带的zookeeper3.5.3-->
        <exclusions>
            <exclusion>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--添加zookeeper3.4.9版本 自己 Zookeeper 的版本-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.9</version>
    </dependency>
    
    
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19

测试接口

测试url (opens new window)

image-20220117180628492

查看 Zookeeper 信息

image-20220117181547422

查看 json 字符串

image-20220117181533952

json 字符串格式化网站 (opens new window)

image-20220117181633392

# 总结

服务节点是临时节点

image-20220117180700687

# 服务消费者

# 建 module

module 名 : cloud-consumerzk-order80

# 改 POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud-learn</artifactId>
        <groupId>com.yixihan.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumerzk-order80</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- zookeeper -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        <!-- 引入自己定义的api通用包,可以使用Payment支付Entity -->
        <dependency>
            <groupId>com.yixihan.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

# 写 YAML

server:
  port: 80

spring:
  application:
    # 服务别名----注册 zookeeper 到注册中心名称
    name: cloud-comsumer-order
  cloud:
    zookeeper:
      # zookeeper 主机 : 端口号
      connect-string: 175.24.229.41:2181

1
2
3
4
5
6
7
8
9
10
11
12

# 主启动

package com.yixihan.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author : yixihan
 * @create : 2022-01-17-18:23
 */
@SpringBootApplication
@EnableDiscoveryClient
public class OrderZkMain80 {

    public static void main(String[] args) {
        SpringApplication.run (OrderZkMain80.class, args);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

# 业务类

config

package com.yixihan.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

/**
 * @author : yixihan
 * @create : 2022-01-17-18:23
 */
@Configuration
public class ApplicationContextConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate () {
        return new RestTemplate ();
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

controller

package com.yixihan.springcloud.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author : yixihan
 * @create : 2022-01-17-18:24
 */
@RestController
@RequestMapping("/consumer")
public class OrderZkController {

    public static final String INVOKE_URL = "http://cloud-provider-payment";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/payment/zk")
    public String paymentInfo () {

        return restTemplate.getForObject (INVOKE_URL + "/payment/zk", String.class);
    }

}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

# 测试

测试接口

测试url (opens new window)

image-20220117183448165

Zookeeper 控制台

image-20220117183518523

最后更新时间: 2022/12/31 下午3:20:26