项目结构图

web.xml

    
    
         
     
      Log4J4Mongodb
          
     
              
              
      
       UserServlet
              
      
       UserServlet
              
      
       com.berwin.test.MongodbLogServlet
          
          
     
              
      
       UserServlet
              
      
       /user
          
      
    

log4j.properties

#将Mongodb日志存放在数据库中，便于做日志分析系统log4j.rootLogger=debug, stdout, R, MongoDB    log4j.appender.stdout=org.apache.log4j.ConsoleAppender  log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  log4j.appender.stdout.layout.ConversionPattern=%-d{MM-dd HH:mm:ss.SSS} %-5p - [%c{1}.%t] %m%n    log4j.appender.R=org.apache.log4j.RollingFileAppender  log4j.appender.R.File=logs/cwBiOHD.log  log4j.appender.R.MaxFileSize=1000KB  log4j.appender.R.MaxBackupIndex=1  log4j.appender.R.layout=org.apache.log4j.PatternLayoutlog4j.appender.R.layout.ConversionPattern=%-d{MM-dd HH:mm:ss.SSS} %-5p - [%c{1}.%t] %m%nlog4j.appender.MongoDB=org.log4mongo.MongoDbAppenderlog4j.appender.MongoDB.databaseName=yanglog4j.appender.MongoDB.collectionName=yanglog4j.appender.MongoDB.hostname=127.0.0.1log4j.appender.MongoDB.port=27017

MongodbLogServlet.java

package com.berwin.test;import org.apache.log4j.Logger; import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class MongodbLogServlet extends HttpServlet {    private static final Logger logger = Logger.getLogger(MongodbLogServlet.class);    private static final long serialVersionUID = 1L;        public MongodbLogServlet() {        super();     }    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        this.doPost(request, response);    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        logger.info("start do get...");        logger.error("请求出错！");    }}