版本说明

先说下使用的spring cloud和spring boot的版本

Disable HystrixCommands For FeignClients By Default

https://github.com/spring-cloud/spring-cloud-netflix/issues/1277

新建子module

父工程microservice-spring-cloud右键新建Maven Module 命名为：micorservice-consumer-movie-feign-hystrix ,为了简单我们把micorservice-consumer-movie-feign的内容copy到该子模块,修改下application.yml中的spring.application.name即可。

application.yml中开启Hystrix

server:
  port: 7901
spring: 
  application:
    name: micorservice-consumer-movie-feign-hystrix  
#eureka
eureka: 
  client:
    service-url:
      defaultZone: http://artisan:artisan123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}
# Disable HystrixCommands For FeignClients By Default
# https://github.com/spring-cloud/spring-cloud-netflix/issues/1277    
feign:
  hystrix:
    enabled: true

如果是application.property ，请设置 feign.hystrix.enabled=true

修改Feign接口

使用fallback属性指定回退类

回退类 也需要实现上面的接口，同时需要标注@Component让其成为受spring管理的bean

测试

1. 启动microservice-discovery-eureka，注册中心
2. 启动micorservice-provider-user，服务提供者
3. 启动micorservice-consumer-movie-feign-hystrix，服务消费者开启了Hystrix

访问http://localhost:8761/ 确认下服务已经注册成功。

访问 http://localhost:7901/movie/1

{"id":1,"username":"artisan1","name":"小工匠一","age":10,"balance":100.00}

功能正常，OK。

现在停掉micorservice-provider-user

访问 http://localhost:7901/movie/1 ，进入了回退方法

{"id":1,"username":"默认用户","name":null,"age":null,"balance":null}

再次启动 micorservice-provider-user

再次访问 http://localhost:7901/movie/1

{"id":1,"username":"artisan1","name":"小工匠一","age":10,"balance":100.00}

功能正常，OK。

代码

https://github.com/yangshangwei/SpringCloudMaster/tree/master/micorservice-consumer-movie-fegin-hystrix