概述

OpenFeign使用步骤

1. 接口+注解：微服务调用接口+@FeignClient

2. 新建cloud-consumer-feign-order80

3. POM

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

4. YML

   server:
     port: 80
   eureka:
     client:
       register-with-eureka: false
       service-url:
         defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
   

5. 主启动：@EnableFeignClients

   java">package com.atguigu.springcloud;
   
   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);
       }
   }
   

6. 业务类

   • 业务逻辑接口+@FeignClient配置调用provider服务

   • 新建PaymentFeignService接口并新增注解@FeignClient

     java">@Component
     @FeignClient(value = "CLOUD-PAYMENT-SERVICE")
     public interface PaymentFeignService {
     
         @GetMapping(value = "/payment/get/{id}")
         public CommonResult getPaymentById(@PathVariable("id") Long id);
     }
     

   • 控制层Controller

     java">@RestController
     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);
         }
     }
     

OpenFeign超时控制

• OpenFeign默认等待一秒钟，超过后报错

• YML文件里需要开启OpenFeign客户端超时控制

  ribbon:
    ReadTimeout:  5000
    ConnectTimeout: 5000
  

OpenFeign日志打印功能

1. 基本概念

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2. 日志级别

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3. 配置日志bean

   java">package com.atguigu.springcloud.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;
       }
   }
   

4. YML文件里需要开启日志的Feign客户端

   logging:
     level:
       com.atguigu.springcloud.service.PaymentFeignService: debug
   

5. 后台日志查看