Monday, August 13, 2012

Log4j Tutorial : How to send log messages to different log file (Module wise)

Create your Dynamic Web project as fallows:




web.xml
package com.cims;

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.Logger;


public class TestLog4jServlet extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;
static Logger logger = Logger.getLogger(TestLog4jServlet.class);

public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException{
logger.info("Starting the "+this.getClass().getName()+" doGet() Method");
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("Log4j Debugger Example");
logger.info("Exiting the "+this.getClass().getName()+" doGet() Method");
logger.debug("Debug Logs");
logger.warn("Warn Messages");
logger.error("Error Logs");
logger.fatal("Fatal logs");

}

}


index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Log4j MultiAppender Example</title>
</head>
<body>
<a href="test"> Test MultiAppender</a>
</body>
</html>


<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>

<appender name="Test2Servlet" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="D:/Test2Servlet.log" />
<param name="Append" value="false" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%-4r [%t] %-5p %c %x - %m%n" />
</layout>
</appender>

<appender name="TestLog4jServlet" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="D:/TestLog4jServlet.log" />
<param name="Append" value="false" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%-4r [%t] %-5p %c %x - %m%n" />
</layout>
</appender>

<category name="com.test">
<priority value="info" />
<appender-ref ref="Test2Servlet" />
</category>

<category name="com.cims">
<priority value="ERROR" />
<appender-ref ref="TestLog4jServlet" />
</category>

<root>
<level value="DEBUG" />

</root>

</log4j:configuration>


Log4JServlet
package com.cims;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.xml.DOMConfigurator;

public class Log4JServlet extends HttpServlet {

public void init() throws ServletException{

String log4jfile = getInitParameter("log4j-init-file");
if(log4jfile != null){
String propfile = getServletContext().getRealPath(log4jfile);
//PropertyConfigurator.configure(propfile);
DOMConfigurator.configure(propfile);
}

}

}


com.test.Test2Servlet
package com.test;

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.Logger;

public class Test2Servlet extends HttpServlet{

/**
* 
*/
private static final long serialVersionUID = 1L;
static Logger logger = Logger.getLogger(Test2Servlet.class);


public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException{

res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("inside the "+this.getClass().getName());
logger.info("Starting "+this.getClass().getName()+".doGet() method");
logger.debug("Debug logs");
logger.warn("warn log");
logger.error("Error logs");
logger.fatal("fatal logs");
logger.info("Exiting "+this.getClass().getName()+".doGet() method");
}


}


com.cims.TestLog4jServlet
package com.cims;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;


public class TestLog4jServlet extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;
static Logger logger = Logger.getLogger(TestLog4jServlet.class);

public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException{
logger.info("Starting the "+this.getClass().getName()+" doGet() Method");
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("Log4j Debugger Example");
logger.info("Exiting the "+this.getClass().getName()+" doGet() Method");
logger.debug("Debug Logs");
logger.warn("Warn Messages");
logger.error("Error Logs");
logger.fatal("Fatal logs");
RequestDispatcher rd = getServletContext().getRequestDispatcher("/test2");
rd.forward(req, res);

}

}

Output









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