架构:

一.新建module

引入依赖:

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

yml配置;

server:port: 80spring:application:name: cloud-consumer-openfeign-order####Spring Cloud Consul for Service Discoverycloud:consul:host: localhostport: 8500discovery:prefer-ip-address: true #优先使用服务ip进行注册service-name: ${spring.application.name}

二.公共模块编写feign调用接口:

package com.wen.cloud.apis;import com.wen.cloud.entities.Pay;
import com.wen.cloud.resp.ResultData;
import org.springframework.cloud.openfeign.FeignClient;
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.RequestBody;@FeignClient(value = "cloud-payment-service")//对应注册中心的模块命名
public interface PayFeignApi {@PostMapping(value = "/pay/add")public ResultData addPay(@RequestBody Pay pay);@GetMapping(value = "/pay/get/{id}")public ResultData getById(@PathVariable("id") Integer id);@GetMapping("/pay/getInfo")public String getInfoByConsul();
}

cloud-payment-service中的方法体与PayFeignApi的对应关系:

将cloud-consumer-feign-order模块启动类添加注释，用于开启@FeignClient(value = "cloud-payment-service")注解

三:项目架构：

consumer中的orderController会自动装配PayFeignApi接口，并调用接口中提供的方法。该接口会通过@FeignClient(value = "cloud-payment-service")中的value名取注册中心寻找对应的微服务模块，并匹配该模块方法的路径并调用。

4.测试: