Springboot中Feign的使用總結

Feign是Webservice服務的客戶端,創建接口+注解就可完成，實現簡單

1. 客戶端通過@EnableFeignClients開啟Feign的支持功能

   
        
        
        
                
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    @SpringBootApplication 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    @EnableEurekaClient 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    @EnableFeignClients 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    @RestController 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    public 
                    class TestApplication { 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
    
                    public static void main(String[] args) { 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
   
                     SpringApplication.run(TestApplication.class, args); 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
   
                     } 
                   
    
                  
    
                 
    
                  
    
                   
    
                  
    
                  
    
                   
   
                     } 
                   
    
                  
    
                
       
       
       
               
   

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   <li>定義接口，通過@FeignClient("remote-service")&nbsp; 注解指定服務名來綁定服務，再使用SpringMVC的注解@RequestMapping來綁定具體該服務提供的REST接口&nbsp;&nbsp;<span style="color:#f33b45;"><strong>注</strong>：服務名不區分大小寫</span>
   <pre class="has" name="code" onclick="hljs.signin(event)"><code class="language-java hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-meta">@FeignClient</span>(name = <span class="hljs-string">"user-service"</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">UserService</span> </span>{</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-meta">@RequestMapping</span>(value = <span class="hljs-string">"/service/getUserinfo"</span>)</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">	<span class="hljs-function"><span class="hljs-keyword">public</span> Map&lt;String, Object&gt; <span class="hljs-title">getUserinfo</span><span class="hljs-params">(@RequestParam(value = <span class="hljs-string">"userid"</span>)</span> String userid)</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">}</div></div></li></ol></code><div class="hljs-button signin" data-title="登錄后復制"></div></pre>
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   <li>創建Controller,注入接口，即可使用</li>
   

補充說明

上面中FeignClient的映射路徑就是調用服務提供者的訪問路徑，根據訪問路徑調用方法。