两种用法
RestTemplate + Hystrix
feign + Hystrix

org.springframework.cloud
spring-cloud-starter-netflix-hystrix



RestTemplate
@HystrixCommand(fallbackMethod = "error")

@Service
public class HelloService {
    @Resource
    RestTemplate eurekaRestTemplate;

    @HystrixCommand(fallbackMethod = "error")
    public String hello(String name) {
        Map map = new HashMap<>();
        map.put("name", name);
        return eurekaRestTemplate.getForObject("http://provider/fegin/hello2",String.class,map);
    }

    public String error(String name) {
        return "HelloService.hello fallback";
    }
}



feign.hystrix.enabled=true

@FeignClient(name = "provider",fallback=HelloFallback.class)
public interface FeginHello 

public class HelloFallback implements FeginHello

@Bean
public HelloFallback helloFallback() {
    return new HelloFallback();
}



/hello2?name=cat

/fegin/hello2?name=dyyx
/fegin/hello3?name=dyyx

不启动 eureka 和 provider  
触发 fallback




完整代码
https://gitee.com/dyyx/springcloud/tree/master/hystrix