Ribbon客户端负载均衡

柔光的暖阳◎ 2022-05-25 07:07 228阅读 0赞

### Ribbon ###

Spring Cloud Netflix Ribbon 是一个客户端负载均衡的组件。

Ribbon的特点

*  和Eureka完美整合
 *  支持多种协议-HTTP,TCP,UDP
 *  缓存/批处理
 *  built in failure resiliency

具体请查看官方文档 ： [https://github.com/Netflix/ribbon/wiki][https_github.com_Netflix_ribbon_wiki]

**整合Ribbon实现客户端的负载均衡**

##### 前期准备 #####

这里用到了上次的两个[demo][](服务注册中心和服务提供者)。   
首先，添加服务提供者的服务，这里我将其端口号打印出来能够更加直观地观察到负载均衡的实现：

<table style="border-spacing:0px;border:1px solid #C0C0C0;width:689.524px;margin:0px;padding:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;min-height:auto;"> 
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   <td style="padding:3px;border-color:#C0C0C0;border-collapse:collapse;margin:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;min-height:auto;"> 
    <div style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:auto;min-height:auto;"> 
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      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@RestController</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">public</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">class</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">PrintfController { </code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;">
       &nbsp; 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@Value</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"${server.port}"</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">)</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">private</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">String port;</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;">
       &nbsp; 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@RequestMapping</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"/service"</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">)</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">public</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">String printf(){ </code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">System.out.println(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"服务消费者正在使用服务，端口号为 : "</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">+port);</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">return</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"success"</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">;</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">}</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">}</code> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

接下来分别启动这两个工程，注意将服务提供者的端口号(原来为1111改为1112)修改后再启动一次.就整个项目而言，总共有三个微服务再运行着(一个注册中心，两个服务提供者)。PS:其实服务提供者你想弄多少都行。

##### 创建服务消费者 #####

像一个普通的 spring cloud 工程一样，创建后向注册中心注册自己的信息。   
添加依赖:

添加消费调用接口：   
这里涉及到一个类`LoadBalancerClient`，这个就是由 Netflix Ribbon 提供的工具类。他会根据 ServiceId （配置文件中的Service Name）向 Eureka （注册服务器）获取服务地址。

<table style="border-spacing:0px;border:1px solid #C0C0C0;width:689.524px;margin:0px;padding:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;min-height:auto;"> 
 <tbody style="margin:0px;padding:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:auto;min-height:auto;"> 
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   <td style="padding:3px;border-color:#C0C0C0;border-collapse:collapse;margin:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:35px;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;min-height:auto;color:rgb(175,175,175);">&nbsp;</td> 
   <td style="padding:3px;border-color:#C0C0C0;border-collapse:collapse;margin:0px;background:none;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:12px;min-height:auto;"> 
    <div style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.1em;vertical-align:baseline;width:auto;min-height:auto;"> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@RestController</code> 
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     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">public</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">class</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">ConsumerController { </code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;">
       &nbsp; 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@Autowired</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">private</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">LoadBalancerClient client;</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;">
       &nbsp; 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#808080;">@RequestMapping</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"/test"</code> 
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     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">public</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">String test(){ </code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">ServiceInstance instance = client.choose(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"service"</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">);</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">URI uri = instance.getUri();</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">System.out.println(uri);</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">return</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">(</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">new</code>&nbsp; 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">RestTemplate()).getForObject(uri+</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:#0000FF;">"/service"</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">,String.</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,255);">class</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">);</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background:rgb(244,244,244) none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;">&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">}</code> 
     </div> 
     <div style="margin:0px;padding:0px 1em;background-image:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;min-height:auto;white-space:nowrap;"> 
      <code style="margin:0px;padding:0px;background:none;border:0px;float:none;height:auto;line-height:1.8em;vertical-align:baseline;width:auto;font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;min-height:auto;white-space:nowrap;color:rgb(0,0,0);">}</code> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

配置文件信息：

注意：`LoadBalancerClient`返回的是已经注册的服务器地址。

##### 启动服务消费者 #####

启动工程后，我们可以看到如下注册信息：

![这里写图片描述][SouthEast]

##### Ribbon 实现负载均衡 #####

多次访问 [http://localhost:2222/test][http_localhost_2222_test] ，并查看控制台信息：   
![这里写图片描述][SouthEast 1]

这样子，就实现了客户端的负载均衡了~

[https_github.com_Netflix_ribbon_wiki]: https://github.com/Netflix/ribbon/wiki
[demo]: https://github.com/FunriLy/springcloud-study/tree/master/%E6%A1%88%E4%BE%8B1
[SouthEast]: /images/20220525/2a423cc823864c33a199235ca8443a0f.png
[http_localhost_2222_test]: http://localhost:2222/test
[SouthEast 1]: /images/20220525/6664c2609f764f1a8a41ad0d7ddbd9cf.png