服务发现组件 Eureka 实现服务间的调用组件Feign

<dependencyManagement>
        <dependencies>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M9</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

<dependencies> 
<dependency>
  <groupId>org.springframework.cloud</groupId> 
  <artifactId>spring‐cloud‐starter‐netflix‐eureka‐ server</artifactId> 
</dependency>//这里无需指定版本号,因为我们在父pom里已经进行了版本控制
 </dependencies>

服务端yml配置
server:
  port: 6868
eureka:
  client:
    register-with-eureka: false  #是否注册到eureka服务器上选择false,因为这是一个服务器模块
    fetch-registry: false #是否拿到注册
    service-url:
      defaultZone: http://127.0.0.1:${server.port}/eureka/


客户端yml配置
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:6868/eureka/
  instance:
    prefer-ip-address: true #部署导线上时,可以使模块之间跨域访问

<dependency> 
<groupId>org.springframework.cloud</groupId> 
<artifactId>spring-cloud-starter-openfeign</artifactId>
 </dependency>

@SpringBootApplication//原有-springboot启动类
@EnableEurekaClient//原有-标明这里是一个服务组件并注册到Eureka
@EnableDiscoveryClient//增加-使的qa服务可以去发现其他服务
@EnableFeignClients//增加- 使的qa服务可以去调用其他服务

package com.tensquare.qa.client;

import entity.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@FeignClient("tensquare-base")
//@FeignClient("tensquare-base")指定调用的服务是哪个
/*
这里的tensquare-base其实是我们在写base服务module时候在yml中指定的名字
spring: 
  application:  
    name: tensquare-base
*/
public interface BaseClient {//调用base的接口
    @RequestMapping(value = "label/{labelId}",method = RequestMethod.GET)
//注意这里RequestMapping里的value要写全label也要写,因为要指定到一个全路径,类似于直接在浏览器输入时候的访问地址
    public Result findById(@PathVariable("labelId") String labelId);//Base中被调用的方法
    //这里必须@PathVariable("labelId") 指定labelId,因为RequestMappering里的labelId是传到PathVariable中的
    //这样在tensquare_base模块中才会在RequestMapper中
}

@RequestMapping("/problem")
public class ProblemController {
    @Autowired
    private BaseClient baseClient;
    //注入我们在qa模块写的base服务模块调用接口
    @RequestMapping(value = "label/{labelId}",method = RequestMethod.GET)
    //写的和base接口中一样就行
    public Result findByLabelId(@PathVariable String labelId){
        Result result = baseClient.findById(labelId);
        return result;
    }

 @RequestMapping(value = "label/1",method = RequestMethod.GET)
    //写的和base接口中一样就行
    public Result findByLabelId(1);