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

 

1. <!-- log4j  begin -->  
2.   <servlet>  
3.     　　<servlet-name>log4j-init</servlet-name>  
4.     　　<servlet-class>com.yandong.curd.utils.Log4jInit</servlet-class>  
5.     　　<init-param>  
6.         　　<param-name>log4j-init-file</param-name>  
7.         　　<param-value>/WEB-INF/log4j.properties</param-value>  
8.     　　</init-param>  
9.     　　<load-on-startup>1</load-on-startup>  
10. 　       </servlet>  
11. <!-- log4j  end -->  

 

 

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

 

[xhtml]  view plain copy

 

1. log4j.rootLogger = DEBUG, stdout, R  
2. log4j.rootCategory=INFO, stdout , R  
3.   
4. log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
5. log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
6. log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n  
7.   
8. log4j.appender.R=org.apache.log4j.DailyRollingFileAppender  
9. log4j.appender.R.File=./log4j.log  
10. log4j.appender.R.layout=org.apache.log4j.PatternLayout  
11. log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n  
12.   
13. log4j.logger.com.neusoft=DEBUG  
14. log4j.logger.com.opensymphony.oscache=ERROR  
15. log4j.logger.net.sf.navigator=ERROR  
16. log4j.logger.org.apache.commons=ERROR  
17. log4j.logger.org.apache.struts=WARN  
18. log4j.logger.org.displaytag=ERROR  
19. log4j.logger.org.springframework=DEBUG  
20. log4j.logger.com.ibatis.db=WARN  
21. log4j.logger.org.apache.velocity=FATAL  
22.   
23. log4j.logger.com.canoo.webtest=WARN  
24.   
25. log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN  
26. log4j.logger.org.hibernate=DEBUG  
27. 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

 

[java]  view plain copy

 

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

 

然后在需要记录日志的地方加上类似

 

[java]  view plain copy

 

1. 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.youkuaiyun.com/xiaxiaorui2003/article/details/4466536

 

使用jar包参见附件