<dependency>

     <groupId>org.springframework.cloud</groupId>

     <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>

     <version>${hystrix.version}</version>

</dependency>

@EnableHystrix  //开启熔断服务

    @HystrixCommand(fallbackMethod = "hystrixGet")

    public Dept get(@PathVariable("id") Long id) {

        Dept dept = deptService.query(id);

        if (dept == null) {

            throw new RuntimeException("id => " + id + ",不存在该用户,或者信息无法找到");

        }

        return dept;

    }

    //备选

    public Dept hystrixGet(@PathVariable("id") Long id) {

        return new Dept()

                .setDNo(id)

                .setDName("id => " + id + "没有对应信息,null--@Hystrix")

                .setDb_source("no this database");

    }