【SpringCloud】Feign使用

配置

maven

<dependencies>
     
     <dependency>
         <groupId>org.springframework.cloudgroupId>
         <artifactId>spring-cloud-starter-openfeignartifactId>
     dependency>
dependencies> 

启动类添加

激活Feign

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

yml

这里用的是eureka，nacos参考nacos相关配置

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

使用

添加Feign服务

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

    @GetMapping(value = "/payment/feign/timeout")
    public String paymentFeignTimeout();
}

Controller

调用PaymentFeignService，之后通过Feign调用相关服务

@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);
    }

    @GetMapping(value = "/consumer/payment/feign/timeout")
    public String paymentFeignTimeout()
    {
        // OpenFeign客户端一般默认等待1秒钟
        return paymentFeignService.paymentFeignTimeout();
    }
}

其他设置

超时设置

OpenFeign默认等待1秒钟，超过后报错
OpenFeign默认支持Ribbon

YML开启OpenFeign客户端超时控制（Ribbon Timeout）

server:
  port: 80

eureka:
  client:
    register-with-eureka: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
#设置feign客户端超时时间(OpenFeign默认支持ribbon)
ribbon:
#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
  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

OpenFeign日志打印功能

对Feign接口的调用情况进行监控和输出

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，还有请求和响应的正文及元数据。

import feign.Logger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FeignConfig
{
    @Bean
    Logger.Level feignLoggerLevel()
    {
    	// 此处修改日志级别
        return Logger.Level.FULL;
    }
}

YML开启日志

logging:
  level:
    # feign日志以什么级别监控哪个接口
    com.atguigu.springcloud.service.PaymentFeignService: debug