Solved

Login validation

Posted on 2007-04-08
5
3,471 Views
Last Modified: 2008-01-09
Hello,
I have a problrm in validation the user name and pass ,I want in the login page when the user enter a null
user name or pass diectly trnsfer loginerror.jsp or give invalid user name and password this my code

<%@ page import= "dds.*" %>
<%@ page import = "java.sql.*" %>
<%@ page import = "java.util.*" %>
<%@ page contentType="text/html;charset=UTF-8"%>
<%

         

        boolean authenticated = false;
        String err = new String("");
        String UserChecked = new String("");
        String user =request.getParameter("Input_User_ID");
          String password = request.getParameter("Input_Password");
          
        System.out.println(user);
      if(user != null && password != null ){
      

          User DDSUser = new User();
          UserChecked = DDSUser.VerifyUser(user,password);
          System.out.println(UserChecked);
          if (UserChecked.equals("OK")) {
             authenticated = true;
             HttpSession mysession = request.getSession(true);
             mysession.setAttribute("Authenticated","TRUE");
             mysession.setAttribute("User",user);
          } else {

            authenticated = false;
          }
          DDSUser.Close();
         
         }
      
%>

<html>

<head>

<title>Main</title>
</head>

<body>

<% if (!authenticated) {
%>                                        
<form action="login.jsp" method=post>
  <div id="Layer1" style="position:absolute; z-index:1; left:0px; top:0px">&nbsp;<img border="0" src="logo.gif" width="224" height="41">
<hr width="100%" size="4" align=left style="color:#FF0000"></div><div id="Layer2" style="position:absolute; z-index:2; left:0px; top:0px">&nbsp;</div><p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <div align="left"><table border="0" cellpadding="2" cellspacing="0" width="99%">
    <tr>
      <td width="499"><div align="left"><p><font face="Verdana" size="3"><b>
      &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  System</b></font></td>
      <td width="485"><div align="right"><p><i><font size="2" face="Verdana">&nbsp;
      <%
      Calendar cal = Calendar.getInstance();
                    java.util.Date today = cal.getTime();
            out.println(""+today);
      %></font></i></td>

</tr>
  </table>
  </div><p style="text-indent: 0; margin: 0">&nbsp;</p>
  <p style="text-indent: 0; margin: 0">&nbsp;</p>
 
 
  <div align="left"><table border="0" cellpadding="2" cellspacing="0" width="889">
    <tr>
      <td width="23"></td>
      <td width="213"><font size="2" face="Verdana">User ID:</font></td>
      <td width="635"><input type="text" name="Input_User_ID" size="15"></td>
    </tr>
    <tr>
      <td width="23"></td>
      <td width="213"></td>
      <td width="635"></td>
    </tr>
    <tr>
      <td width="23"></td>
      <td width="213"><font size="2" face="Verdana">Password:</font></td>
      <td width="635"><input type="password" name="Input_Password" size="6"></td>
    </tr>
    <tr>
      <td width="23"></td>
      <td width="213"><p style="text-indent: 0; margin: 0">&nbsp;</p>
      <p style="text-indent: 0; margin: 0">&nbsp;</td>
      <td width="635"></td>
    </tr>

    <tr>
      <td width="23"></td>
      <td width="848" colspan="2"><div align="left"><p><input type="submit" value="Login"
      name="B1"> <input type="reset"
      value="Reset" name="B2"></td>
    </tr>
<td width="23"></td>
                   
             <TD>
             <p>&nbsp;</p>      
             
                  <p align="left"><font color=red><% response.sendRedirect("loginerr.jsp");
                %></font></p>
            <td>
   
  </table>
  </div>
</form>    
<tr>
                  
             
</tr>
<%}else{
      response.sendRedirect("search.jsp");
}%>

      
</body>
</html>
0
Comment
Question by:Ibrahimsairafi
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
5 Comments
 
LVL 10

Expert Comment

by:Jaax
ID: 18871802
Maybe some exceptions is thrown. And that is causing for the else condition to be overlooked.
Check if any exception is thrown. Better to have the redirect code after the local try-catch for authenticating the user
0
 
LVL 1

Author Comment

by:Ibrahimsairafi
ID: 18871839
yeah it gaves me
org.apache.jasper.JasperException: java.lang.NullPointerException
      org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:532)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
0
 
LVL 10

Accepted Solution

by:
Jaax earned 250 total points
ID: 18871878
When a non-business exception is thrown, it is better to route to a common System Error page.
You can specify the sysError.jsp like this :
<%@ page errorPage="sysError.jsp" %>
And in sysError.jsp have
<%@ page isErrorPage="true" %>

From the complete stack trace were you able to locate the line that causes the exception. It is not so obvious from your and the partial stack trace


0

Featured Post

[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

With the rising number of cyber attacks in recent years, keeping your personal data safe has become more important than ever. The tips outlined in this article will help you keep your identitfy safe.
The recent Petya-like ransomware attack served a big blow to hundreds of banks, corporations and government offices The Acronis blog takes a closer look at this damaging worm to see what’s behind it – and offers up tips on how you can safeguard your…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question