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一、在前面的工程基础上，增加一个service-feign的子模块。

修改父工程的pom.xml 把service-feign添加到它的子模块里面去

           
    
     eureka-server
            
    
     eureka-client
            
    
     service-ribbon
            
    
     service-feign
        
   

service-feign的pom.xml内容如下：

   
       
    
     4.0.0
        
    
     service-feign
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     service-feign
        
    
     Demo project for Spring Boot
        
            
     
      com.example
             
     
      chapter2
             
     
      0.0.1-SNAPSHOT
         
        
            
     
      UTF-8
             
     
      UTF-8
             
     
      1.8
         
        
            
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-netflix-eureka-client
              
             
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-openfeign
              
         
        
            
                 
                      
       
        org.springframework.cloud
                       
       
        spring-cloud-dependencies
                       
       
        ${spring-cloud.version}
                       
       
        pom
                       
       
        import
                   
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                   
              
         
        
            
                 
      
       spring-milestones
                  
      
       Spring Milestones
                  
      
       https://repo.spring.io/milestone
                  
                      
       
        false
                   
              
         
    
   

application.properties配置如下：

eureka.client.service-url.defaultZone=http://localhost:8001/eureka/spring.application.name=service-feignserver.port=8005

ServiceFeignApplication配置如下：

package com.example;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.openfeign.EnableFeignClients;/** * @author xiaobu @EnableFeignClients 开启feign功能 */@SpringBootApplication@EnableDiscoveryClient@EnableEurekaClient@EnableFeignClientspublic class ServiceFeignApplication {    public static void main(String[] args) {        SpringApplication.run(ServiceFeignApplication.class, args);    }}

feign目录结构如下：

定义一个feign接口

package com.example.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2018/11/6 14:24 * @description V1.0 定义个feign接口 @FeignClient("服务名") 来确定调哪个服务 */@FeignClient("eureka-client")public interface FeignService {    /***     * @author xiaobu     * @date 2018/11/6 14:34     * @param name 名字     * @return java.lang.String     * @descprition value为test则是调用 eureka-client的test的方法     * RequestMapping(value="/test",method = RequestMethod.GET)与GetMapping(value="/test")等价     * RequestParam.value() was empty on parameter 0 第一个参数不能为空     * @version 1.0     */    //@RequestMapping(value="/test",method = RequestMethod.GET)    @GetMapping(value="/test")    String testFromClient(@RequestParam(value = "name") String name);}

定义一个controller

package com.example.controller;import com.example.service.FeignService;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;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2018/11/6 14:22 * @description V1.0 调用feignService的test方法 */@RestControllerpublic class FeginController {    @Autowired    FeignService feignService;    @GetMapping("/test")    public String test(@RequestParam String name){        return feignService.testFromClient(name);    }}

输入结果如下：

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