SpringCloud系列（8）--将服务提供者Provider注册进Eureka Server

前言：上一章节我们介绍了Eureka服务端的安装与配置，本章节则介绍关于微服务如何入职Eureka Server

Eureka架构原理图

1、修改provider-payment8001子模块的pom.xml文件，引入Eureka Clinet的依赖，然后reolad一下，下载依赖

例：

<?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>springcloud01</artifactId>
        <groupId>com.ken.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>provider-payment8001</artifactId>

    <dependencies>
        <!--以下依赖都没写版本号，没写版本号的情况下会引用父项目的版本-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--Mybatis和SpringBoot的整合-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </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>
        <!--热部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!--lombok插件-->
        <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>
        <!--引入自己定义的api调用包，可以使用Payment模块的entity-->
        <dependency>
            <groupId>com.ken.springcloud</groupId>
            <artifactId>api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!--Eureka Clinet-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

2、修改provider-payment8001子模块的application.yml文件配置的内容，将Eureka相关配置引入

#服务端口号
server:
  port: 8001

#服务名称
spring:
  application:
    name: cloud-payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource      #当前数据源操作类型
    driver-class-name: com.mysql.cj.jdbc.Driver       #mysql驱动包（mysql驱动包版本是5的要写成com.mysql.jdbc.Driver）
    url: jdbc:mysql://localhost:3306/cloud?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8 #mysql连接路径，记得把cloud这个数据库名改成自己的，或者新建名为cloud的数据库
    username: root
    password: 123456

eureka:
  client:
    #表示是否将自己注册进Eureka Server里，默认为true
    register-with-eureka: true
    #是否从Eureka Server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

#mybatis配置
mybatis:
  mapper-locations: classpath:mapper/*.xml            #扫描类路径下的mapper文件夹下所有的.xml配置文件
  type-aliases-package: com.ken.springcloud.entities  #该包下的所有Entity类都取默认别名

效果图：

3、修改provider-payment8001子模块的主启动类，将provider-payment8001子模块标注为Eureka Client

package com.ken.springcloud;

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

@SpringBootApplication
//标注为Eureka Client（服务注册中心）
@EnableEurekaClient
public class PaymentMain {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain.class, args);
    }
}

效果图：

4、启动provider-payment8001子模块的主启动类，测试provider-payment8001子模块是否成功注册进Eureka

注意：要显启动Eureka Server，然后再启动Eureka Client

效果图：

若看到Instances currently registered with Eureka下面多出一行名为cloud-pamyent-service的服务的相关信息，则证明provider-payment8001子模块成功注册进了Eureka，如下图所示：

注：我们在application.yml配置文件里的写的服务名称就是注册在Eureka Server里的名称