A simple example of log4j for Servlet

This Example shows you how to create a log in a Servlet.

Description of the code:

Logger.getLogger(): Logger class is used for handling the majority of log operations and getLogger method is used for return a logger according to the value of the parameter. If the logger already exists, then the existing instance will be returned. If the logger is not already exist, then create a new instance.

log.info(): This method is used to check that the specified category is INFO enabled or not, if yes then it converts the massage passed as a string argument to a string by using appropriate object renderer of class ObjectRenderer.

LoggingServlet :




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 LoggingServlet extends HttpServlet {



  private static Logger logger = Logger.getLogger(LoggingServlet.class);



  protected void processRequest(HttpServletRequest request,


  



HttpServletResponse response)

throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter writer = response.getWriter(); try { logger.info("invoked the LoggingServlet..."); writer.println("Check your web server console..."); writer.flush(); writer.close(); } finally { writer.close(); } } protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException { processRequest(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException { processRequest(request, response); } }

Output:

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