OpenFeign的常规使用

架构:

一.新建module

引入依赖:

 
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>

yml配置;

server:
  port: 80
 
spring:
  application:
    name: cloud-consumer-openfeign-order
  ####Spring Cloud Consul for Service Discovery
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        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: