For our passwords we are going to implement a strict policy about their format. Unit testing is very important in these situations because they provide good feedback about the correctness of our regular expressions. You can test your program and reassure that your regular expression meets the rules on your policy about the form of the usernames or passwords.

java program for validating username and password-37

In this section we will show you how to create an option panel to handle your username and password. The 'Message-Digest Algorithm 5' is a cryptographic hash-function that was invented by Roland L. To use MD5 in our application we can use some features of Java. But we have a problem with our created options panel. Your entered password will now be created as a MD5-hash.

The second method creates a proper string representation and it is needed to avoid non-printable characters.

Before you begin, you need to install the following software on your computer: To have as little work as possible, we will use some very interesting features of Net Beans IDE to create our simple user management. Here we will show you the encryption of your password with the MD5 algorithm.

This management will only be able to store one username and one password in a preferences file. When your restart your application you will see that these changes are persistant. A very good possibility to make your system safer is to encrypt your password with an algorithm called MD5. So if you want to use this, you have to do some changes on your code in the 'store' method.

The passwords and usernames will be stored in a preferences file, which is not very safe.

Therefore, this tutorial will provide a solution to encrypt the passwords with "Message-Digest Algorithm 5" (MD5).

In some cases, such as on mobile devices, displaying the password may improve usability without compromising security.

After all it's only the browser display being obfuscated and not the data transfer.

Here, we are giving our Java Script codes for validating Login form.