Java program for validating username and password

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Here this regular expression allows must contain one digit, one lower case char, one upper case char, some special chars, length should be within 6 to 15 chars.

do Get() method is used to get information, while do Post() method is used for posting information.

The below given example shows how to validate a user name. In OOP program, unit of program is object, which is nothing but combination of data and code.

The regular expression pattern allows lower case alphanumeric characters, allows '-', '_'. In procedural program, data is exposed to the whole program whereas in OOPs program, it is accessible with in the object and which in turn assures the security of the code.

Then, when a returning ATM user enters their username and password, the customer collection can be searched for an existing username and corresponding password to validate the user's logon.

If a new customer, the new ussername and password will be added to the customer collection.

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The below given example shows how to validate a password using regular expression.

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It is important to validate the form submitted by the user because it can have inappropriate values. Java Script provides facility to validate the form on the client-side so data processing will be faster than server-side validation.

New users get added to a file and I have to validate usernames and passwords from that same file. It is very difficult to read and fully understand so much code that has no description. If the code is not functioning as you'd like, post examples of what you want it to do and actual results from running the code that show how it does not agree with your specification, cut and past if possible.

Please describe it in detail - tell what the classes do, basic logic of methods etc. Since the assignment requires a file of customer usernames and passwords, you need to define the format of the file and then read it into a collection of some kind.

In this example, we are going to validate the name and password.

The name can’t be empty and password can’t be less than 6 characters long. The user will not be forwarded to the next page until given values are correct.

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