配置

maven

<dependencies><!--openfeign--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></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: falseservice-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
{@Resourceprivate 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: 80eureka:client:register-with-eureka: falseservice-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
{@BeanLogger.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