spring cloud Eureka client配置（consumer通过Eureka发起对provider的调用）

参考：http://www.ityouknow.com/springcloud/2017/05/12/eureka-provider-constomer.html

springboot版本：2.0.3.RELEASE

首先配置一个Erureka server，这里为了方便我们可以使用单机版并启动服务，参考上一篇文章《spring cloud Eureka server配置》

provider配置

pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
   <!-- 引入客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
　　<!-- 非必须，监控用 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

application.yml

spring:
  application:
    name: spring-cloud-provider
server:
  port: 8080
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8765/eureka
# spring boot信息，可选配置
info:
  app:
    name: spring-cloud-provider-wly
    version: 1.0.0

启动类（添加@EnableDiscoveryClient注解，用于注册到Eureka）

package com.wang.eurekaprovider;

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

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaproviderApplication {

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

controller

package com.wang.eurekaprovider.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author wly
 * @Date 2018/6/27 16:15
 */
@RestController
@RequestMapping("/a")
public class HelloController {
    @RequestMapping("/b")
    public String hello(String name) {
        return "Hello World!" + name;
    }
}

启动服务并访问

http://localhost:8080/a/b?name=sb

页面展示（chrome浏览器）

Hello World!sb

consumer配置

pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
　　<!-- 引入客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
　　<!-- 引入feign -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
　　<!-- 非必须，监控用 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

application.yml

spring:
  application:
    name: spring-cloud-consumer
server:
  port: 8081
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8765/eureka
# spring boot信息，可选配置
info:
  app:
    name: spring-cloud-consumer-wly
    version: 1.0.0

启动类（添加@EnableDiscoveryClient、@EnableFeignClients注解）

package com.wang.eurekaconsumer;

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

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class EurekaconsumerApplication {

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

调用接口定义

package com.wang.eurekaconsumer.remote;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @FeignClient.name对应provider的spring.appliation.name
 * @RequestMapping要和想调用的服务一致，方法名随意，参数名要一致（猜测是用Rest方式调用）
 * @Author wly
 * @Date 2018/6/27 17:08
 */
@FeignClient(name="spring-cloud-provider")
public interface HelloRemote {
    @RequestMapping("/a/b")
    public String hahaha(@RequestParam("name")String qqq);
}

controller

package com.wang.eurekaconsumer.controller;

import com.wang.eurekaconsumer.remote.HelloRemote;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Description
 * @Author wly
 * @Date 2018/6/27 17:16
 */
@RestController
@RequestMapping("/a")
public class HelloController {
    @Autowired
    private HelloRemote helloRemote;

    @RequestMapping("/c")
    public String hello(String name) {
        return helloRemote.hahaha(name);
    }
}

启动服务并访问

http://localhost:8081/a/c?name=sb

页面展示（chrome浏览器）

Hello World!sb

调用结果和provider一致！

查看Eureka页面（发现服务成功注册）

正常流程：启动服务后应该先看监控注服务是否注册成功~

补充

如果使用不同端口启动多个provider，它会自动的进行负载均衡，有兴趣的同学可以尝试一下。

贴两张provider的图

下面是我同时启动两个provider，通过consumer访问后，provider的控制台效果