Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Help creating a Login servlet

Posted on 2003-11-23
4
Medium Priority
?
637 Views
Last Modified: 2013-11-24
This is a chunk of my code from my LoginServlet.java:

      public void printLoginTable(PrintWriter out)

      {
            

            out.println("<h2>Login</h2>");
            out.println("<FORM METHOD=POST ACTION="/com/wrox/servlet/Authenticate1">");
            out.println("ID: <INPUT TYPE=TEXT NAME=uid SIZE=20><BR>");
            out.println("Password: <INPUT TYPE=PASSWORD NAME=pw SIZE=20><BR>");
            out.println("<P><INPUT TYPE=SUBMIT>");
            out.println("</FORM>");
              String userId = req.getParameter("uid");
              String password = req.getParameter("pw");
                bool validated = validate(userId,password);
                if(validated)
                 {
                           printLogged(out);
                 }
                 else
                 {
                          out.println("INVALID");
                          //then go back to some other page...
                 }
      }

basically its purpose is to create the HTML form to take in a user id and password, then the last two lines are supposed to take those two parameters and process those strings elsewhere. Am i doing this correctly?  I'm guessing not because i have to worry about the "onclick" action of an html form...but how do i make my req.getParameter wait for onclick? Or am i totally off?
0
Comment
Question by:jinduy
[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
4 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 200 total points
ID: 9805687
Your main problem is a logical one. What you're doing is simultaneously creating a form to allow the user to log in and behaving as if a login has already taken place. If you are only just creating the form, how can

>>String userId = req.getParameter("uid");

be anything other than null, unless the login *has* taken place? And if it has, why print the login form?

What you should be doing is either using two different pages - one to print the form and another to receive it, or, if you're using the same page/servlet, you should be either printing the form or processing it, but not both.

You should really save the login in the session, so if you can't find it in the session, you know the user has to log in and you can print the login form.


0
 

Expert Comment

by:lapchern
ID: 9808658
oh yeah... userID will always be null =(


can you please elaborate more on saving the "login in the session..."

how do i save the login in a session? Do u mean saving the username of the login in the session? Thanks
0
 

Author Comment

by:jinduy
ID: 9808664
oops i replied with my lab partner's login just now...so yeah...
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 9810090
>>Do u mean saving the username of the login in the session?

Yes.

requestion.getSession().setAttribute("username", username);
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

I had a project requirement for a displaying a user workbench .This workbench would consist multiple data grids .In each grid the user will be able to see a large number of data. These data grids should allow the user to 1. Sort 2. Export the …
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
Suggested Courses

671 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