SpringBoot整合Hystrix服务降级案例(一)

一、服务端配置服务降级

1）、相关依赖

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


  org.springframework.cloud
  spring-cloud-starter-netflix-eureka-client

2）、启动类开启@EnableCircuitBreaker

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class,args);
    }
}

3）、业务类开启服务降级@HystrixCommand

@Service
public class PaymentService {


    public String paymentInfoOk(Integer id) {
        return "线程池："+Thread.currentThread().getName()+" paymentInfoOk,id:"+id;
    }

    @HystrixCommand(fallbackMethod = "paymentInfoTimeOutHandler",commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "5000")
    })
    public String paymentInfoTimeOut(Integer id) throws InterruptedException {
       // int age=1/0;
        TimeUnit.SECONDS.sleep(3);
        return "线程池："+Thread.currentThread().getName()+" paymentInfoTimeOut,id:"+id+"，耗时3秒钟";
    }

    public String paymentInfoTimeOutHandler(Integer id){
        return "线程池："+Thread.currentThread().getName()+" paymentInfoTimeOut繁忙请稍后重试,id:"+id+"，服务降级";
    }

}

二、客户端配置服务降级

1）、相关依赖

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


  org.springframework.cloud
  spring-cloud-starter-openfeign


  org.springframework.cloud
  spring-cloud-starter-netflix-eureka-client

2）、全局配置

server:
  port: 80
spring:
  application:
    name: cloud-order-service

eureka:
  client:
    #表示是否将自己注册进Eureka Server 默认为true
    register-with-eureka: true
    #是否从Eureka Server抓取已有的注册信息，默认为true。单节点无所谓。集群必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

#设置Feign客户端连接超时时间(openFeign默认支持ribbon)
ribbon:
  #指的是建立连接所用时间，使用于网络状态正常情况下，两端连接所用时间
  ReadTimeout: 5000
  #指的是建立连接后从服务器读取到可用资源所用的时间
  ConnectTimeout: 5000
feign:
  hystrix:
    enabled: true

3）、业务类开启服务降级@HystrixCommand

@DefaultProperties指定全局的，@HystrixCommand指定特定的

@RestController
@Slf4j
@DefaultProperties(defaultFallback = "paymentInfoGlobalTimeOutHandler")
public class PaymentHystrixController {
    @Resource
    private PaymentHystrxFeign paymentHystrxFeign;

    @GetMapping("/payment/hystrix/ok/{id}")
    public String paymentInfoOk(@PathVariable("id") Integer id){
       return paymentHystrxFeign.paymentInfoOk(id);
    }


   /* @HystrixCommand(fallbackMethod = "paymentInfoTimeOutHandler",commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "3000")
    })*/
    @HystrixCommand(commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "3000")})
    @GetMapping("/payment/hystrix/timeout/{id}")
    public String paymentInfoTimeOut(@PathVariable("id") Integer id){
        int agg=1/0;
        return paymentHystrxFeign.paymentInfoTimeOut(id);
    }

    public String paymentInfoTimeOutHandler(@PathVariable("id")Integer id){
        return "线程池："+Thread.currentThread().getName()+" 特定服务降级，繁忙请稍后重试,id:"+id+"，服务降级";
    }

    public String paymentInfoGlobalTimeOutHandler(){
        return "线程池："+Thread.currentThread().getName()+" 全局服务降级，繁忙请稍后重试,id:服务降级";
    }
}

3)、测试服务降级