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Feign是自带断路器，需要在配置文件中开启断路器

改造消费者项目（FeignDemo）

1、在application.yml配置文件中开启断路器

eureka:client:service-url:defaultZone: http://127.0.0.1:9000/eureka/
server:port: 9004
spring:application:name: cppdy-feign
feign:hystrix:enabled: true

2、创建HelloServiceImpl实现类

package com.cppdy.service.impl;import org.springframework.stereotype.Component;import com.cppdy.service.HelloService;@Component
public class HelloServiceImpl implements HelloService {@Overridepublic String hello(String name) {return "Sorry,Server Error:" + name;}}

3、在HelloService接口中设置断路器回调实现类

package com.cppdy.service;import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;import com.cppdy.service.impl.HelloServiceImpl;@FeignClient(value = "cppdy-hello", fallback = HelloServiceImpl.class)
public interface HelloService {@RequestMapping("hello")String hello(@RequestParam("name") String name);
}

 4、先启动EurekaDemo（注册中心项目），再启动FeignDemo（消费者项目）端口号设置为9004，访问http://localhost:9004/hello，会调用断路器设置的回调实现类中的方法