上编说了《RestTemplate+Ribbon整合断路器Hystrix》，这篇来看看如何Feign整合断路器Hystrix，Feign整合断路器Hystrix也是相对比较简单的。Feign默认已经自带断路器Hystrix，所以不需要像RestTemplate+Ribbon整合断路器Hystrix那样需要在SpringBoot的启动类添加注解。但是Feign自带断路器并没有打开，需要做些额外的配置。

feign:

hystrix:

enabled: true

1、 新建项目sc-eureka-client-consumer-feign-hystrix，对应的pom.xml文件如下

"http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

spring-cloud

sc-eureka-client-consumer-feign

0.0.1-SNAPSHOT

jar

sc-eureka-client-consumer-feign

http://maven.apache.org

org.springframework.boot

spring-boot-starter-parent

2.0.4.RELEASE

org.springframework.cloud

spring-cloud-dependencies

Finchley.RELEASE

pom

import

UTF-8

1.8

1.8

org.springframework.cloud

spring-cloud-starter-netflix-eureka-client

org.springframework.boot

spring-boot-starter-web

org.springframework.cloud

spring-cloud-starter-openfeign

备注：从继续关系可以看出spring-cloud-starter-openfeign已经集成断路器Hystrix

2、新建springboot启动类

package sc.consumer;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication

@EnableEurekaClient

@EnableFeignClients

public class ConsumerFeignApplication {

public static void main(String[] args) {

SpringApplication.run(ConsumerFeignApplication.class, args);

}

}

3、 新建配置文件bootstrap.yml和application.yml

bootstrap.yml

server:

port: 5800

application.yml

spring:

application:

name: sc-eureka-client-consumer-feign-hystrix

eureka:

client:

registerWithEureka: true #是否将自己注册到Eureka服务中，默认为true

fetchRegistry: true #是否从Eureka中获取注册信息，默认为true

serviceUrl:

defaultZone: http://localhost:5001/eureka/

feign:

hystrix:

enabled: true

说明：在application.yml配置文件添加了开启断路器Hystrix的配置项

4、新建服务消费者类UserService.java

package sc.consumer.service;

import java.util.Map;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.web.bind.annotation.DeleteMapping;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.PutMapping;

import org.springframework.web.bind.annotation.RequestBody;

import org.springframework.web.bind.annotation.RequestMapping;

import sc.consumer.model.User;

import sc.consumer.service.hystrix.UserServiceHystrix;

@FeignClient(value="sc-eureka-client-provider