Spring Cloud 之 Feign

Feign是什么?

Feign是一个声明式WebService客户端.使用Feign能让编写WebService客户端更加简单,它的使用方法是定义一个接口,然后在上面添加注解,同时也支持JAX-RS标准的注解.Feign也支持可拔插式的编码器和解码器.Spring Cloud对Feign进行了封装,使其支持了Spring MVC标准注解和HttpMessageConverters.Feign可以与Eureka和Ribbon组合使用以支持负载均衡.

git地址:git@github.com:alfredhua/spring-cloud-manage.git

server模块，m-consume-feign模块

加入依赖

compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-openfeign', version: '2.2.3.RELEASE'

package com.consume.controller;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient("server")
public interface FeignClientTest {

    @GetMapping("/getByUsername")
    String consumer();
}



package com.consume.controller;

import com.consume.config.UrlConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class TestController {
    @Autowired
    FeignClientTest feignClient;
    @GetMapping("/consumer")
    public String consumer() {
        return feignClient.consumer();
    }

}