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ID Verification using JSP

Article by: Nouman Rashid (2/26/2003)
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Summary: One of the most important parts of web development is to make sure that only authorized users get access to certain areas of the site. This tutorial takes a look at various steps involved in making JSP pages which validate a user ID and password from a MS Access database which contains the username and password.
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ID Verification using JSP



If you are developing site for a simple departmental store or if you are lucky enough to be developing one for NASA, you will still be asked to give the User Verification functionality. This is the most important demand of the client. Have no fear, as you have come to the right place at the right time. Together we will make few pages and code which will cover your basic needs.

For this example I have used Tomcat server. Though it hardly matters if you use any other one. You will just have to place JSP pages and the java class in some other folder.

Ok, enough formal talk. Let's get to business. First part is to make the Login page.

This page will have a Username field and a password field. Users will see it when they will come to your awesome site. Here's the code.

I call this page main.jsp

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Copy this code and save it as either an HTML or JSP page in your server. If you are using TOMCAT it would be webapps\examples\jsp folder.

Now we will come to the very important question - who to let in to your site and who to refuse? For this we will make a database. I am using MS Access. Here make a table, call it Registration and register it with ODBC Data Source Administrator in your control panel. Make two columns UserName and password as I would be using them in my code.

Done? Good,lets move forward.

See the Action part of the Form tag in the above code. After the user enters his/her username and password, it takes us to process2.jsp. This is our controller JSP. It decides which page to take the user to, depending upon the input. It uses a java bean to do that. Confused? Don't worry, a bean is just a little java code we use in JSP to make things very easy.

Here's the controller JSP page (called process2.jsp). Save it into the same directory you did the Login page.

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Here's the bean code which the controller JSP uses to verify the username and password.

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Complie this code and place the class file in the webapps\examples\web-inf\classes\foo folder. Create a new foo folder if necessary.

Before getting to the final stages of the application, let's make two more pages. One will be success.jsp and other will be retry.jsp. Copy them to the corresponding directory of your server. Now get your webserver starting.

As I am using Tomcat I would write the url as http://localhost:8080/examples/jsp/main.jsp. Here you will enter the user name and password.

Let's see, I have got the following entry in the databse

UserName nouman
password ceab


If I enter the above combination, I will go through to the site, otherwise I will be shown the retry page, which will just say buddy! try again.

Though this is very simple application, I hope you can see that it could be enhanced very easily.

How do I make this code better? Just throw me a line at nouman_rashid@yahoo.com




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