Log User Activities - Java Log4j - HTML - Apache - Eclipse - Log in Example



Log User Activities
Java-Log4j - HTML - Apache - Eclipse

Logging example:


22-06-2013 13:53:32 INFO  LogInController:33 - 2K8CSE logs in.
22-06-2013 13:54:02 ERROR LogInController:40 - 2K8CSE failed to log in.
22-06-2013 13:54:16 ERROR LogInController:40 - ABCD failed to log in.

Screen shots:

After successful Log in:

Welcome to home page.


Steps: 
1. Add log4j-1.2.16 jar file to the project.




2. Add log4j.properties to the project.

# Root logger option
log4j.rootLogger=INFO, file, stdout
 
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\\Users\\nn\\Desktop\\nnEclipse4\\UserAuditExample\\systemlog.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{dd-MM-yyyy HH:mm:ss} %-5p %c{1}:%L - %m%n
 
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{dd-MM-yyyy HH:mm:ss} %-5p %c{1}:%L - %m%n

3. In LogInController (controller, servlet) add the following code in constructor.
 Logger log = Logger.getLogger(LogInController.class);

4. Add the following code to log the information to the log file.
log.info(message);
eg:
log.info(username+" logs in.");
log.error(username+" failed to log in.");

Project Explorer:


login.html
<!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>Log in</title>
<script type="text/javascript">
function validateForm()
{
 
 var x=document.getElementById("username");
 if (x.value=="")
   {
  
  document.getElementById('username_innermsg').innerHTML="Please enter the User Name.";
    x.focus();
  return false;
   }
 
 document.getElementById('username_innermsg').innerHTML='';
 var x=document.getElementById("paswd");
 if (x.value=="")
   {
  
  document.getElementById('password_innermsg').innerHTML="Please enter the Password.";
    x.focus();
  return false;
   }
 
 document.getElementById('password_innermsg').innerHTML='';
}

function resetInnerHtmlMsgs() {
 document.getElementById('username_innermsg').innerHTML='';
 document.getElementById('password_innermsg').innerHTML=''; 
}
</script>

</head>
<body>
<center>
<h1>Log in</h1>
<form  action="LogInController" method="post" onsubmit="return validateForm()">
<table>
<tr>
<td>User Name :</td><td><input type="text" name="username" id="username"></td><td width="200px"> <i style="color: red;" id="username_innermsg"></i></td>
</tr>
<tr>
<td>Password :</td><td><input type="password" name="paswd" id="paswd"></td><td width="200px"> <i style="color: red;" id="password_innermsg"></i></td>
</tr>
<tr><td><input type="submit" value="Login"></td><td><input type="reset" value="Cancel" onclick="resetInnerHtmlMsgs()"/></td></tr>
</table>
</form>
</center>
</body>
</html>

LogInController.java

 package com.logexample.controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import com.logexample.model.LogIn;

@WebServlet("/LogInController")
public class LogInController extends HttpServlet {
 private static final long serialVersionUID = 1L;
 private Logger log;
       public LogInController() {
        super();
        log = Logger.getLogger(LogInController.class);
     }
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  
 }

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  LogIn login= new LogIn("2K8CSE", "Password@123");
  RequestDispatcher rd= null;
  String username= request.getParameter("username");
  String password=request.getParameter("paswd");
  if(username.equals(login.getUsername())&&password.equals(login.getPassword()))
  {
   log.info(username+" logs in.");
   rd=request.getRequestDispatcher("success.html");
   rd.forward(request, response);
   return;
  }
  else
  {
   log.error(username+" failed to log in.");
   rd=request.getRequestDispatcher("error.html");
   rd.forward(request, response);
   return;
  }
 }

}

Login.java
package com.logexample.model;

public class LogIn {
 private String username;
 private String password;
 public LogIn(String username, String password) {
  super();
  this.username = username;
  this.password = password;
 }
 public LogIn() {
  super();
 }
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 

}

success.html
 <html>
<head>
<title>Home</title>
</head>
<body>
<center><br/><br/>
<h2>Welcome to home page.</h2>
</center>
</body>
</html>

Download: UserAuditExample

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