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1、Feign简介

Feign 整合了ribbon，具有负载均衡的能力；Feign 采用的是基于接口的注解

2、新建模块

新建一个服务消费者模块consumer-feign，代码结构如下图所示。

2.1 pom文件

   
       
    
     4.0.0
        
    
     com.cntaiping.tpa
        
    
     consumer-feign
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     consumer-feign
        
    
     Demo project for Spring Boot
        
            
     
      com.cntaiping.tpa
             
     
      cloud
             
     
      1.0-SNAPSHOT
         
        
            
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-netflix-eureka-client
              
             
                 
      
       org.springframework.boot
                  
      
       spring-boot-starter-web
              
             
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-openfeign
              
         
    
   

2.2 配置文件application.yml

eureka:  client:    serviceUrl:      defaultZone: http://localhost:8800/eureka/server:  port: 8500spring:  application:    name: consumer-feign

2.3 启动类

package com.cntaiping.tpa.consumerfeign;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication@EnableFeignClientspublic class ConsumerFeignApplication {    public static void main(String[] args) {        SpringApplication.run(ConsumerFeignApplication.class, args);    }}

2.4 服务消费类

（1）Service层

package com.cntaiping.tpa.consumerfeign.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;@FeignClient(value = "producer")public interface SchedualService {    @RequestMapping(value = "/get",method = RequestMethod.GET)    String hello(@RequestParam(value = "name") String name);}

（2）controller层

package com.cntaiping.tpa.consumerfeign.controller;import com.cntaiping.tpa.consumerfeign.service.SchedualService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class MessageController {    @Autowired    SchedualService schedualService;    @GetMapping(value = "/hello")    public String hello(@RequestParam String name) {        return schedualService.hello( name );    }}

2.5 运行效果

转载地址：http://rgvab.baihongyu.com/