Validate in server side..

**Ganezan** · October 26th, 2009, 08:01 AM

Hai all,

I have one doubt in my project. I want to validate input should be a number in server side... if u knows this, give the solution for that...

Kind Regards

**literallyjer** · October 26th, 2009, 10:32 AM

Are you using servlets?

What type of number are you expecting the input to be? If you're expecting an integer, you can do this:

Object input = new Integer(2);
if (input instanceof Integer)
  // the input is an integer
else
  // the input is something else

**copeg** · October 26th, 2009, 11:13 AM

Assuming your input is a String entitled 'input':

int inputAsString = 0;
try{
    inputAsString = Integer.parseInt(input);
}catch ( NumberFormatException nfe ){
    //deal with invalid number
}

or

if ( !input.matches("[0-9]+") ){//you can change this depending upon expeced input...negatives, decimals, length, etc...
//deal with invalid number
}

**Json** · October 27th, 2009, 03:44 AM

Oh nooooes, here we go.

This will not work on floating point numbers like float or double but it will work for integers and below.

    public static boolean isDigits(final String input) {
        if (input == null) {
            return false;
        } else if ("".equals(input)) {
            return false;
        } else {
            for (int i = 0; i < input.length(); ++i) {
                if (!Character.isDigit(input.charAt(i))) {
                    return false;
                }
            }
        }
 
        return true;
    }

However if I was you I'd check out Lang - Home

// Json

**Ganezan** · October 27th, 2009, 06:36 AM

Thanks literallyjer, copeg and Json’s. Hai Json’s, I understand your point...
Thanks for your info...

Regards,

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