SpringCloud（五）feign请求api-CFANZ编程社区

简介：

feign是一个声明式的伪http客户端，默认集成ribbon，并与eureka结合，实现了负载均衡的功能。可替代restTemplate_+ribbon

在上一篇的基础上，修改eureka-client

引入maven包：

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

在启动类上加上下面注解：

package com.xhx.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients   //启用feign
public class EurekaFeignApplication {

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

创建一个feign接口：

package com.xhx.springcloud.api;

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

/**
 * xuhaixing
 * 2018/6/5 16:51
 */
@FeignClient(value = "EUREKA-SERVICE",path = "hello")
public interface HelloFeign {

    @RequestMapping(value = "getName")
    public String getName(@RequestParam("name") String name);//@RequestParam 必须加上，否则可能会接不到参数
}

其中

value：代表要访问的服务的名称

path: 代表路径

等同于访问：http://EUREKA-SERVICE/hello/getName

在controller中注入并调用：

package com.xhx.springcloud.controller;

import com.netflix.discovery.converters.Auto;
import com.xhx.springcloud.api.HelloFeign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * xuhaixing
 * 2018/6/3 16:27
 */
@RestController
public class RibbionController {

    @Autowired
    private HelloFeign helloFeign;

    @RequestMapping(value = "getName")
    public String getName(String name){
        return helloFeign.getName(name);
    }
}