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Thread: Validate in server side..

  1. #1
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    Default Validate in server side..

    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


  2. #2
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    Default Re: Validate in server side..

    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

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    Administrator copeg's Avatar
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    Default Re: Validate in server side..

    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
    }
    Last edited by copeg; October 26th, 2009 at 12:16 PM.

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    Super Moderator Json's Avatar
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    Default Re: Validate in server side..

    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
    Last edited by Json; October 27th, 2009 at 04:46 AM.

  5. #5
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    Default Re: Validate in server side..

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

    Regards,

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