Springboot整合Hystrix

前言：

因为最近做一个请求你其他项目接口的功能，为防止请求超时，所以就想到了SpringCloud组件的Hystrix做熔断处理，这个组件的讲解可以看https://blog.youkuaiyun.com/loushuiyifan/article/details/82702522这位博主的详细讲解，主要就是做一个熔断操作，防止前端用户一直等待请求回馈。

实现：

1. 添加pom

           <!-- 监控熔断-->
           <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-hystrix-dashboard -->
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
               <version>2.2.2.RELEASE</version>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
               <version>2.1.1.RELEASE</version>
           </dependency>

    

2. 配置yml

   hystrix:
     command:
       default:
         execution:
           isolation:
             strategy: THREAD
             thread:
               # 线程超时10秒,调用Fallback方法
               timeoutInMilliseconds: 10000

    

3. 创建HystrixConfiguration类

   package com.funi.psfs.bank.config;
   
   import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
   import org.springframework.boot.web.servlet.ServletRegistrationBean;
   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   
   @Configuration
   public class HystrixConfiguration {
   
       @Bean
       public ServletRegistrationBean getServlet(){
           HystrixMetricsStreamServlet hystrixMetricsStreamServlet = new HystrixMetricsStreamServlet();
           ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(hystrixMetricsStreamServlet);
           servletRegistrationBean.setLoadOnStartup(1);
           servletRegistrationBean.addUrlMappings("/hystrix.stream");
           servletRegistrationBean.setName("HystrixMetricsStreamServlet");
           return servletRegistrationBean;
       }
   }
   

    

4. 添加@HystrixCommand注解   需要注意业务传参和下面的fallback的参数数量一致，否则会报错

       @Override
       @HystrixCommand(fallbackMethod = "fallback")
       public ResultEntity bankServiceConfirm() {
               return ResultEntity.error("确认流程异常");
           }
       }
   
       public ResultEntity fallback() {
           return ResultEntity.error("请求超时.......");
       }

    

5. 演示打了断点请求超时后执行 fallback代码