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Log4J使用

1.導入包

2.在WEB-INF目錄下添加一個配置文件log4j.properties

log4j.rootLogger=DEBUG,A1,A2

# 輸出到控制臺

log4j.appender.A1=org.apache.log4j.ConsoleAppender

log4j.appender.A1.layout=org.apache.log4j.PatternLayout

log4j.appender.A1.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} ["u4fe1"u606f] %m%n

# 輸出到日志文件

log4j.appender.A2=org.apache.log4j.FileAppender

log4j.appender.A2.File=${catalina.home}/webapps/test_log4j/logging.log

log4j.appender.A2.Append=true

log4j.appender.A2.layout=org.apache.log4j.PatternLayout

log4j.appender.A2.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} ["u4fe1"u606f] %m%n

3.在JSP中應用Log4j

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

<%@ page import="org.apache.log4j.*" %>

<html>

<head>

</head>

<body>

Test Log4j <br>

<hr>

//載入配置文件

PropertyConfigurator.configure(request.getRealPath("WEB-INF/log4j.properties"));

//取得日志記錄器

Logger logger = Logger.getLogger(this.getClass());

logger.fatal("這是一條從index.jsp產生的fatal信息！");

logger.error("這是一條從index.jsp產生的error信息！");

logger.warn("這是一條從index.jsp產生的warn信息！");

logger.debug("這是一條從index.jsp產生的debug信息！");

logger.info("這是一條從index.jsp產生的info信息！");

</body>

</html>

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Log4j在Servlet中的應用

package com.yzk.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.*;

public class TestLog4j extends HttpServlet {

Logger logger = null;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

response.setCharacterEncoding("GB18030");

logger.fatal("這是一條從 TestLog4j 產生的fatal信息！");

logger.error("這是一條從 TestLog4j 產生的error信息！");

logger.warn("這是一條從 TestLog4j 產生的warn信息！");

logger.debug("這是一條從 TestLog4j 產生的debug信息！");

logger.info("這是一條從 TestLog4j 產生的info信息！");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

this.doGet(request, response);

}

public void init() throws ServletException {

PropertyConfigurator.configure(this.getServletContext().getRealPath("WEB-INF/log4j.properties"));

logger = Logger.getLogger(this.getClass());

}

WEB.XML中的配置

<servlet-name>TestLog4j</servlet-name>

<servlet-class>com.yzk.servlet.TestLog4j</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>TestLog4j</servlet-name>

<url-pattern>/servlet/TestLog4j</url-pattern>

</servlet-mapping>

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修改成在Tomcat啟動時自啟動日志

新建一個Servlet來專門做初始化的工作

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.*;

public class InitLog4j extends HttpServlet {

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

public void init() throws ServletException {

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

String confFile = getInitParameter("log4j");

if (confFile!=null){

PropertyConfigurator.configure(basePath+confFile);

}else{

System.out.println("指定的Log4j配置文件不存在，將影響應用中的日志記錄輸出！");

}

在web.xml中的修改配置

<servlet-name>TestServlet</servlet-name>

<servlet-class>TestServlet</servlet-class>

</servlet>

<servlet-name>InitLog4j</servlet-name>

<servlet-class>InitLog4j</servlet-class>

<init-param>

<param-name>log4j</param-name>

<param-value>WEB-INF/log4j.properties</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>TestServlet</servlet-name>

<url-pattern>/TestServlet</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>InitLog4j</servlet-name>

<url-pattern>/InitLog4j</url-pattern>

</servlet-mapping>

package com.yzk.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.*;

public class TestLog4j extends HttpServlet {

Logger logger = null;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

response.setCharacterEncoding("GB18030");

logger.fatal("這是一條從 TestLog4j 產生的fatal信息！");

logger.error("這是一條從 TestLog4j 產生的error信息！");

logger.warn("這是一條從 TestLog4j 產生的warn信息！");

logger.debug("這是一條從 TestLog4j 產生的debug信息！");

logger.info("這是一條從 TestLog4j 產生的info信息！");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

this.doGet(request, response);

}

public void init() throws ServletException {

//PropertyConfigurator.configure(this.getServletContext().getRealPath("WEB-INF/log4j.properties"));

logger = Logger.getLogger(this.getClass());

}

posted on 2008-12-28 13:09 游上岸的魚閱讀(197) 評論(0) 編輯收藏

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