springcloud微服务（九）-服务发现Discovery

我就是我 2023-10-06 20:47 13阅读 0赞

Discovery功能：

对于注册进Eureka里面的微服务，可以通过服务发现来获取服务的信息。此处以payment8001为例。payment8002与payment8001一样。

## 1. 修改cloud-prodvider-payment8001的controller。 ##

@RestController
    @Slf4j
    public class PaymentController {
    
        @Autowired
        private PaymentServices paymentServices;
    
        @Value("${server.port}")
        private String serverPort;
    
        @Autowired
        private DiscoveryClient discoveryClient;//服务发现，就是展示服务的一些信息
    
        @GetMapping("/payment/get/{id}")
        public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id)
        {
             Payment payment=paymentServices.getPaymentById(id);
             log.info("********查询结果*********："+payment);
             if(payment != null)
             {
                 return new CommonResult<>(200,"查询数据成功,serverport:"+serverPort,payment);
             }else
             {
                 return new CommonResult<>(444,"查询到对应的记录，查询ID："+id);
             }
    
        }
        @PostMapping("/payment/create")
        public CommonResult addPayment(@RequestBody Payment payment)
        {
    
           int result = paymentServices.addPayment(payment);
           log.info("******插入结果："+result);
           if(result>0)
           {
               return new CommonResult(200,"插入成功");
           }else
           {
               return new CommonResult(445,"插入失败");
           }
        }
    
        @GetMapping("/payment/discovery")
        public Object getDiscovery()
        {
            List<String> services= discoveryClient.getServices();
            for (String service:services) {
                log.info("******service:"+service);
            }
    
            List<ServiceInstance> instances= discoveryClient.getInstances("cloud-payment-service");
            for (ServiceInstance instance:instances) {
                log.info(instance.getHost()+"\t"+instance.getInstanceId()+"\t"+instance.getPort()+"\t"+instance.getServiceId());
            }
            return this.discoveryClient;
        }
    }

## 2. 主启动类修改，需增加服务发现注解 ##

@SpringBootApplication
    //@EnableEurekaClient
    @EnableDiscoveryClient
    public class PaymentMain8001 {
        public static void main(String[] args)
        {
            SpringApplication.run(PaymentMain8001.class,args);
        }
    }

2.1 请注意我把Eureka服务发现的注解替换成了注解@EnableDiscoveryClient

@EnableDiscoveryClient和@EnableEurekaClient共同点就是：都是能够让注册中心能够发现，扫描到该服务。

不同点：@EnableEurekaClient只适用于Eureka作为注册中心，@EnableDiscoveryClient 可以是适用于Eureka作为注册中心，也适用于其他注册中心（例如Zookeeper、Consul等）。