1.依赖包引入

             
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-netflix-hystrix
                  
      
       2.0.2.RELEASE
              
     

2.主函数加入注解

@EnableHystrix

开启熔断器

3.编写熔断器faillbackMethod

package com.example.eurekaribbonclient.controller;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;@RestControllerpublic class clientController {    @Autowired    RestTemplate restTemplate;    @RequestMapping("/hello")    @HystrixCommand(fallbackMethod = "helloError")    public String hello() {        return restTemplate.getForObject("http://eureka-client/hello", String.class);    }        public String helloError() {        return "hello error";    }}