从零搭建springcloud微服务（六）----Hystrix（熔断器）

一、整合feign和Hystrix

1.修改配置文件
cloud-consumer模块的配置文件中增加feign.hystrix.enabled=true

2.在user-open-api模块下增加package包名：com.plkd.usercenter.client.hystrix

新增实现类UserRemoteClientFallback实现UserRemoteClient接口
@Component
public class UserRemoteClientFallback implements UserRemoteClient {
@Override
public UseDto findUserByUserName(String userName) {
System.out.println("系统异常，请稍后再试！");
return null;
}
}
注意这里要加上@Component，否则会以下异常：

Caused by: java.lang.IllegalStateException: No fallback instance of type class com.plkd.usercenter.client.hystrix.UserRemoteClientFallback found for feign client cloud-provider

3.将user-open-api模块下UserRemoteClient类
@FeignClient("cloud-provider")修改成@FeignClient(value = "cloud-provider", fallback = UserRemoteClientFallback.class)

4.修改cloud-consumer模块下CloudConsumerApplication类

增加@ComponentScan(value = "com.plkd")

二.启动cloud-consumer，启动cloud-provider

浏览器访问http://localhost:8080/order/getUserByOrderId/1

关闭cloud-provider服务，浏览器访问http://localhost:8080/order/getUserByOrderId/1

console输出