SpingCloud(H版&alibaba)框架開發教程-25 OpenFeign服務呼叫、超時處理、日誌增強
技術標籤：SpingCloud(H版&alibaba)spring bootspring cloudspring cloud alibabafeignopenfeign
cloud-consumer-feign-order80模組
微服務模組
1. 建module
New --> Module --> Maven[Module SDK:1.8.0_191] --> name[cloud-consumer-feign-order80] --> Finish
2. 改pom
<?xml version="1.0" encoding="UTF-8"?> 3. 寫yml
server:
port: 80
eureka:
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka
4. 主啟動
新建類：com.antherd.springcloud.OrderFeignMain80
package com.antherd.srpingcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients
public class OrderFeignMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderFeignMain80.class, args);
}
}
新建類：com.antherd.srpingcloud.service.PaymentFeignService
package com.antherd.srpingcloud.service;
import com.antherd.springcloud.entities.CommonResult;
import com.antherd.springcloud.entities.Payment;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
@Component
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {
@GetMapping(value = "/payment/{id}")
CommonResult<Payment> getPaymentById(@PathVariable("id") Long id);
}
新建類：com.antherd.srpingcloud.contorller.OrderFeignController
package com.antherd.srpingcloud.contorller;
import com.antherd.springcloud.entities.CommonResult;
import com.antherd.springcloud.entities.Payment;
import com.antherd.srpingcloud.service.PaymentFeignService;
import javax.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
public class OrderFeignController {
@Resource
private PaymentFeignService paymentFeignService;
@GetMapping("/consumer/payment/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id) {
return paymentFeignService.getPaymentById(id);
}
}
5. 啟動測試
啟動：cloud-eureka-server7001，cloud-eureka-server7002，cloud-provider-payment8001，cloud-provider-payment8002，cloud-consumer-order80五個模組
訪問：http://localhost/consumer/payment/1
6. 超時處理
預設Feign客戶端只等待一秒鐘，但是服務端處理需要超過一秒鐘，導致Feign客戶端不想等待了，直接返回報錯。為了避免這樣的情況，有時候我們需要設定Feign客戶端的超時控制。
下面演示Feign超時報錯：
cloud-provider-payment8001、cloud-provider-payment8002模組
com.antherd.springcloud.controller.PaymentController新增新介面：
@GetMapping(value = "/payment/feign/timeout")
public String paymentFeignTimeout() throws InterruptedException {
TimeUnit.SECONDS.sleep(3);
return serverPort;
}
cloud-consumer-feign-order80模組
com.antherd.srpingcloud.service.PaymentFeignService新增新方法：
@GetMapping(value = "/payment/feign/timeout")
String paymentFeignTimeout();
com.antherd.srpingcloud.contorller.OrderFeignController新增新介面：
@GetMapping(value = "/consumer/payment/feign/timeout")
String paymentFeignTimeout() {
// openfeign-ribbon客戶端預設等待一秒鐘
return paymentFeignService.paymentFeignTimeout();
}
訪問：http://localhost:8001/payment/feign/timeout、http://localhost/consumer/payment/feign/timeout 看一下效果吧
修改cloud-consumer-feign-order80的yml配置檔案，設定Feign客戶端的超時控制
新增如下配置：
# 設定feign客戶端超時時間（OpenFeign預設支援ribbon）
ribbon:
# 指的是建立連線所用的時間，適用於網路狀況正常的情況下，兩端連線所用的時間
ConnectTimeout: 5000
# 指的是建立連線後從伺服器讀取到可用資源所用的時間
ReadTimeout: 5000
訪問：http://localhost/consumer/payment/feign/timeout 看一下效果
7. 日誌增強
Feign提供了日誌列印功能，我們可以通過配置來調整日誌級別，從而瞭解Feign中Http請求的細節（對Feign介面的呼叫情況進行監控和輸出）
日誌級別：
- NONE：預設的，不顯示任何日誌
- BASIC：僅記錄請求方法、URL、響應狀態碼及執行時間
- HEADERS：除了BASIC中定義的資訊之外，還有請求和響應頭資訊
- FULL：除了HEADERS中定義的資訊之外，還有請求和響應的正文及元資料
新建類：com.antherd.srpingcloud.config.FeignConfig
package com.antherd.srpingcloud.config;
import feign.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class FeignConfig {
@Bean
Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
修改cloud-consumer-feign-order80的yml配置檔案
新增如下配置：
logging:
level:
# feign日誌以什麼級別監控哪個介面
com.antherd.springcloud.service.PaymentFeignService: debug