[Cloud]8-OpenFeign

OpenFeign

是什么?

Feign是一个声明式WebService客户端。使用Feign能让编写Web Service客户端更加简单。
它的使用方法是定义一个服务接口然后在上面添加注解即可。

github: 点击访问

能干嘛?

可以在使编写Java Http客户端变得更容易。

前面在使用Ribbon+RestTemplate时,利用RestTemplate对http请求的封装处理,形成了一套模版化的调用方法。

编码

新建cloud-comsumer-fegin-order80

pom新增

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

yml

server:
  port: 80

eureka:
  client:
    register-with-eureka: false   #是否将自己注册到注册中心,集群必须设置为true配合ribbon
    service-url:
      #defaultZone: http://localhost:7001/eureka
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/  #集群版

主启动类

@EnableFeignClients

@SpringBootApplication
@EnableFeignClients
public class OrderFeignMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderFeignMain80.class, args);
    }
}

业务类编写

定义一个feign接口

@Configuration
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {

    @GetMapping(value = "/payment/get/{id}")
    CommonResult<Payment> getPaymentById(@PathVariable("id") Long id);
}

controller

@RestController
@Slf4j
public class OrderFeignController {

    @Resource
    private PaymentFeignService paymentFeignService;

    @GetMapping(value = "/consumer/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
        return paymentFeignService.getPaymentById(id);
    }
}

测试

访问 http://127.0.0.1/consumer/payment/get/1 即可发现跟前面写的Ribbon+RestTemplate效果一致。


OpenFeign超时控制

cloud-provider-payment8001服务新增接口,同时cloud-comsumer-fegin-order80服务的PaymentFeignService接口和controller同样添加调用。

    @GetMapping("/payment/feign/timeout")
    public String paymentFeignTimeOut(){
        //测试OpenFeign超时
        try {
            TimeUnit.SECONDS.sleep(3);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        return serverPort;
    }

测试

访问http://127.0.0.1:8001/payment/feign/timeout -正常

访问http://127.0.0.1/consumer/payment/feign/timeout -超时

connect timed out executing GET http://CLOUD-PAYMENT-SERVICE/payment/feign/timeout
feign.RetryableException: connect timed out executing GET http://CLOUD-PAYMENT-SERVICE/payment/feign/timeout
    at feign.FeignException.errorExecuting(FeignException.java:213)

超时解决配置

#设置feign客户端超时时间
ribbon:
  #指的是建立连接后从服务器读取到可用资源所用的时间
  ReadTimeout: 5000
  #指的是建立连接所用的时间,适用于网络状况正常的情况下,两端连接所用的时间
  ConnectTimeout: 5000

OpenFeign日志增强

日志级别

NONE:默认的,不显示任何日志;

BASIC:仅记录请求方法、URL、响应状态码及执行时间;

HEADERS:除了BASIC中定义的信息之外,还有请求和响应的头信息;

FULL:除了HEADERS中定义的信息之外,还有请求和响的正文及元数据。

添加配置类

@Configuration
public class FeignConfig {

    @Bean
    Logger.Level feignLoggerLevel(){
        return Logger.Level.FULL;
    }
}

yml

logging:
  level:
    #以什么级别监控哪个接口
    xyz.zx21.springcloud.service.PaymentFeignService: debug

测试

访问 http://127.0.0.1/consumer/payment/get/1

控制台输出日志

2020-03-22 19:46:33.369 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] ---> GET http://CLOUD-PAYMENT-SERVICE/payment/get/1 HTTP/1.1
2020-03-22 19:46:33.370 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] ---> END HTTP (0-byte body)
2020-03-22 19:46:33.376 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] <--- HTTP/1.1 200 (6ms)
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] connection: keep-alive
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] content-type: application/json
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] date: Sun, 22 Mar 2020 11:46:33 GMT
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] keep-alive: timeout=60
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] transfer-encoding: chunked
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] 
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] {"code":200,"message":"查询成功,serverPort: 8001","data":{"id":1,"serial":"小信"}}
2020-03-22 19:46:33.377 DEBUG 3496 --- [p-nio-80-exec-2] x.z.s.service.PaymentFeignService        : [PaymentFeignService#getPaymentById] <--- END HTTP (88-byte body)

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文章标题:[Cloud]8-OpenFeign

文章字数:975

本文作者:周信

发布时间:2020-03-22, 19:01:51

最后更新:2020-03-22, 19:47:31

原始链接:http://zx21.xyz/2020/03/22/Cloud-8-OpenFeign/

版权声明: "署名-非商用-相同方式共享 4.0" 转载请保留原文链接及作者。

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