spring cloud 的hystrix 熔断器 和feign 调用的使用

1， 添加依赖

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
   <version>2.0.2.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-openfeign</artifactId>
   <version>2.1.3.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

2，yml 文件开启熔断

feign:
  hystrix:
    enabled: true

3，启动类上的注解

@EnableHystrix
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class DemoApplication {

   public static void main(String[] args) {
      SpringApplication.run(DemoApplication.class, args);
   }

}

4，feign 的接口

@FeignClient(name = "testInfo", fallback= RemoteHelloCallBack.class)
public interface RemoteHello {
    @RequestMapping(value = "/hello/error", method = RequestMethod.GET)
    public String getError();

    @RequestMapping(value = "/hello/get", method = RequestMethod.GET)
    public String getRemote();

}

5，hystrix 的使用

@Component
public class RemoteHelloCallBack implements RemoteHello {
    @Override
    public String getError() {
        return "RemoteError is block";
    }

    @Override
    public String getRemote() {
        return "get Remote hello  is block";
    }
}

6， 控制层简单的调用

@RestController
public class HelloController {
    @RequestMapping("/hello")
    public String hello() {
        return "helle consul";
    }
    @Autowired
    RemoteHello hello;
    @RequestMapping("/getRemote")
    public String getRemote() {
        return hello.getRemote();
    }

    @RequestMapping("/geterror")
    public String geterror() {
        return hello.getError();
        //return  "this is error message..";
    }

}