logback打印日志输出线程ID：mvc拦截器模式

一、前言

经常处理业务问题的同仁，一定都经常与日志打交道。当并发量高、多线程编程时，日志往往是一大堆，为了快速精确的定位、处理问题，我们需要区分各个用户的不同会话请求，需要从一坨坨日志中做链路追踪。

思路：在输出日志的时候，将每个线程的ID同时输出，当然前提是保证每个线程的ID是唯一的。sl4j 提供的一个工具类MDC，支持 logback和log4j，作用就是扩展变量值到日志中并输出。

二、MVC拦截器模式输出线程ID

1. 加入POM引用

   
       org.springframework.boot
       spring-boot-starter-web
   

    

2. 自定义日志拦截器

   package cn.wuhg.climbing.service.design.patterns.sessionid.mvcfilter;
   
   import lombok.extern.slf4j.Slf4j;
   import org.slf4j.MDC;
   import org.springframework.stereotype.Component;
   import org.springframework.web.servlet.HandlerInterceptor;
   import org.springframework.web.servlet.ModelAndView;
   
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   import java.util.UUID;
   
   /**
    * 日志拦截器
    */
   @Slf4j
   @Component
   public class LogInterceptor implements HandlerInterceptor {
       // 会话ID
       private final static String SESSION_ID = "sessionId";
   
       @Override
       public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) {
           String uuid = UUID.randomUUID().toString().replaceAll("-", "");
           MDC.put(SESSION_ID, uuid);
           return true;
       }
   
       @Override
       public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) {
           MDC.remove(SESSION_ID);
   
       }
   
       @Override
       public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
       }
   }
   

    

3. 重写MCV过滤器

   package cn.wuhg.climbing.service.design.patterns.sessionid.mvcfilter;
   
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
   import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
   
   @Configuration
   public class WebMvcConfigurer extends WebMvcConfigurerAdapter {
       @Autowired
       private LogInterceptor logInterceptor;
   
       @Override
       public void addInterceptors(InterceptorRegistry registry) {
           registry.addInterceptor(logInterceptor);
           super.addInterceptors(registry);
       }
   }
   

    

4. logback配置

   ​
   
   
       SpringBootDemo
       
       
       
       
       
           ${LOG_PATH}/${APPDIR}/logs.log
           
           
               
               ${LOG_PATH}/${APPDIR}/logs-%d{yyyy-MM-dd}.%i.log
   			
               
               
                   20MB
               
           
           
           true
           
           
               %d{yyyy-MM-dd HH:mm:ss.SSS} [%X{sessionId}] %-5level %class.%method Line:%-3L - %msg%n
               utf-8
           
       
       
           
           
               %d{yyyy-MM-dd HH:mm:ss.SSS} [%X{sessionId}] %-5level %class.%method Line:%-3L - %msg%n
               utf-8
           
           
           
               debug
           
       
       
       
           
           
       
   
   
   ​

    

5. Controller接口

   ​
   @LogId
   @GetMapping("/log")
       public void logId(){
       log.info("测试slf4j日志线程ID");
   }
   
   ​

    

6. 日志截图
   

三、往期推荐

logback打印日志输出线程ID：切面模式

 

作者：Smile潇洒Tel 

转载请注明出处，谢谢合作！