Feign配置日志的打印级别

一、细粒度的配置Feign的日志级别（针对每个微服务配置）

　1、java代码方式

（1）在Feign接口注解上面配置configuration

/**
 * @author : maybesuch
 * @version : 1.0
 * @Description : 用户中心Feign接口
 * @Date : 2020/1/9 11:43
 * @Copyright : Copyright (c) 2020 All Rights Reserved
 **/
@FeignClient(value = "user-center", configuration = UserCenterFeignConfiguration.class)
public interface UserCenterFeignClient {

    @GetMapping("/users/{id}")
    UserDTO findById(@PathVariable("id") Integer id);

}

（2）定义configuration内容，也就是feign的日志级别

Logger有四种类型：NONE(默认)、BASIC、HEADERS、FULL，通过注册Bean来设置日志记录级别

注意：在此方法上不需要@Configuration注解，否则会被所有的FeignClient共享，如果添加了注解，则需要将此类放到启动时扫描不到的包

/**
 * @author : maybesuch
 * @version : 1.0
 * @Description : 定义请求用户中心Feign的日志级别
 * @Date : 2020/1/9 17:24
 * @Copyright : Copyright (c) 2020 All Rights Reserved
 **/
public class UserCenterFeignConfiguration {

    @Bean
    Logger.Level feignLoggerLevel(){
        // 设置日志
        return Logger.Level.FULL;
    }
}

（3）将Feign的全路径在application.yml中配置

logging:
  level:
#    com.maybesuch.contentcenter.feignclient.UserCenterFeignClient: debug
    com.maybesuch: debug

2、配置文件的方式

只需在application.yml中添加配置：

logging:
  level:
#    com.maybesuch.contentcenter.feignclient.UserCenterFeignClient: debug
    com.maybesuch: debug

feign:
  client:
    config:
      # 要调用服务的名称
      user-center:
        loggerLevel: full

二、全局日志级别的配置

1、java代码的方式

（1）在启动类@EnableFeignClients注解上配置defaultConfiguration

@SpringBootApplication
@EnableFeignClients(defaultConfiguration = GlobalFeignConfiguration.class)
public class ContentCenterApplication {

    public static void main(String[] args) {
        SpringApplication.run(ContentCenterApplication.class, args);
    }
}

（2）定义GlobalFeignConfiguration类，此类也不需要@Configuration注解

/**
 * @author : maybesuch
 * @version : 1.0
 * @Description : 定义全局Feign的日志级别
 * @Date : 2020/1/9 17:24
 * @Copyright : Copyright (c) 2020 All Rights Reserved
 **/
public class GlobalFeignConfiguration {

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

（3）配置文件application.yml中需配置日志级别方能打印出Feign调用的日志信息

logging:
  level:
    com.maybesuch: debug

2、配置文件方式

　　只需在application.yml中添加配置：

logging:
  level:
    com.maybecare: debug

feign:
  client:
    config:
      # feign全局日志级别
      default:
        loggerLevel: full

日志打印结果：

c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] ---> GET http://user-center/users/1 HTTP/1.1
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] ---> END HTTP (0-byte body)
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] <--- HTTP/1.1 200  (17ms)
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] content-type: application/json;charset=UTF-8
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] date: Fri, 10 Jan 2020 05:33:40 GMT
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] transfer-encoding: chunked
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById]
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] {"id":1,"bane":"maybesuch"}
c.m.c.feignclient.UserCenterFeignClient  : [UserCenterFeignClient#findById] <--- END HTTP (161-byte body)