java-log4j（j2ee）

1.创建log4j初始类

package com.yandong.curd.utils;

 

import java.io.IOException;

 

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import org.apache.log4j.xml.DOMConfigurator;

 

public class Log4jInit extends HttpServlet {

public void init(ServletConfig config) throws ServletException {

super.init(config);

String prefix = getServletContext().getRealPath("/");

String file = getInitParameter("log4j-init-file");

System.out.println("--------  Log4J Start  --------- ");

if (file != null) {

DOMConfigurator.configure(prefix + file);

}

}

 

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

}

}

 

 

2.首先在WEB.XML中加上

  [xhtml] view plaincopy

<!-- log4j  begin -->
  <servlet>
    　　<servlet-name>log4j-init</servlet-name>
    　　<servlet-class>com.yandong.curd.utils.Log4jInit</servlet-class>
    　　<init-param>
        　　<param-name>log4j-init-file</param-name>
        　　<param-value>/WEB-INF/log4j.properties</param-value>
    　　</init-param>
    　　<load-on-startup>1</load-on-startup>
　       </servlet>
<!-- log4j  end -->

 

 

3. 在/WEB-INF/log4j.properties目录下创建log4j.properties，内容为

 

log4j.rootLogger = DEBUG, stdout, R
log4j.rootCategory=INFO, stdout , R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n

log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=./log4j.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n

log4j.logger.com.neusoft=DEBUG
log4j.logger.com.opensymphony.oscache=ERROR
log4j.logger.net.sf.navigator=ERROR
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.apache.struts=WARN
log4j.logger.org.displaytag=ERROR
log4j.logger.org.springframework=DEBUG
log4j.logger.com.ibatis.db=WARN
log4j.logger.org.apache.velocity=FATAL

log4j.logger.com.canoo.webtest=WARN

log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN
log4j.logger.org.hibernate=DEBUG
log4j.logger.org.logicalcobwebs=WARN

 

 

4. 在lib目录下加载

log4j-1.2.8.jar 和 commons-logging.jar

 

5. 在servlet或者action中加上

 

private static Log log =
    LogFactory.getLog(SRTHPrepareData.class.getName());

 

然后在需要记录日志的地方加上类似

 

log.error("数据为空");

 

 

6 然后运行之后到log4j.log文件中去查看日志

 

参考网址：http://blog.csdn.net/xiaxiaorui2003/article/details/4466536

 

使用jar包参见附件