1、在实现类实现熔断

1）、主启动类使用@EnableCircuitBreaker开启降级

@SpringBootApplication
@EnableFeignClients
@EnableCircuitBreaker
public class ServerShopWareApplication {

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

}

2）、方法上使用@Hystrix注解

@Service
@Slf4j
public class IMessageService1Impl implements IMessageService1 {

    public ResultResponse handleError(MessageVo messageVo) {
        System.out.println("handleError:熔断了");
        return ResultResponse.FAILED(500);
    }

    @Override
    @HystrixCommand(
            fallbackMethod = "handleError",
            commandProperties = {
                    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000")
            })
    public ResultResponse sendMessage(MessageVo messageVo) {
        try {
            for (int index = 0; index < 10; index++) {
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return ResultResponse.SUCCESS();
    }
}

2、在接口上实现熔断

1）、application.properties配置文件添加配置

## 启动熔断器
feign.hystrix.enabled=true

2）、启动类添加@EnableHystrix

3）、方法使用@HystrixCommand

    @PostMapping(value = "/msg1")
    @HystrixCommand(
            fallbackMethod = "handleError",
            commandProperties = {
                    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "3000")
            })
    public ResultResponse test1(@RequestParam("msg") String msg) {
        MessageVo messageVo = new MessageVo();
        messageVo.setId(IdWorker.getId());
        messageVo.setType(1);
        messageVo.setData(msg);

        return iMessageService1.sendMessage(messageVo);
    }

    public ResultResponse handleError(@RequestParam("msg") String msg) {
        System.out.println("handleError(controller):熔断了");
        return ResultResponse.FAILED(404);
    }

参考文档

• https://blog.csdn.net/weixin_44817761/article/details/125153663
• https://www.jianshu.com/p/8117fa0f03fb