I have the jsp which accepts the customers name.And this name is encoded when sent to the another service.The service checks the length of the name.If it exceeds more than 20 characters then it rejects the input.
Having said that, If the user enters any special charater like @ or $ or some thing else then the encoding processs will convert that single character in to 3 or 4 character long.So if the user enters say, 17 characters with couple of special characters then because of the encoding the length becomes more than 20 characters.
The encoding of the string (URL encoding I assume) is only needed to make sure the server understands all contents. On the server you don't need it to be encoded anymore so you can simply decode it back. A simple check for a total length of 20 should be enough.
Manish Singh wrote:why are you encoding the special characters?
Because the URL specification says that some characters have special meaning, and characters need to be encoded for communication between client and server. For instance, spaces become + signs or %20.
And if encoding is a must then prevent user from more than entering affective 20 chars. Use 'onkepup' event listener on the username text box to do it.