2 Replies Latest reply: Jan 21, 2013 3:19 PM by aksarben RSS

    How to check checkbox values in servlet?

    884510
      My web application has got a form with numerous items which includes check boxes too. I need to get the values of Checked check boxes alone from the jsp and use it for further manipulation in my servlet. But when i tried to check it i am getting null pointer exception.


      i checked using the following coding methodology in my servlet:


      String a = request.getParameter("CHECKBOX1'S NAME");
      String b = request.getParameter("CHECKBOX2'S NAME");
      .
      .
      .
      .
      String n = request.getParameter("CHECKBOXN'S NAME");

      System.out.println(a+b+........+n);//to check whether null or on returned from jsp


      if(a.equals(null) && b.equals(null) && ....n.equals(null)){// i am getting null pointer exception in the this line

      /* Some logic here */
      }else if ( a.equals("on") && b.equals("on") && ...n.equals("on")){

      /* Some logic here */

      }else if(a.equals("on") && b.equals("null").... n.equals("on")){
      /* Some logic here */
      }


      likewise different combinations of else if's....{
      /*
      Some logic here
      */
      }


      thanks.

      Edited by: 881507 on Jan 18, 2013 4:09 AM

      Edited by: 881507 on Jan 18, 2013 4:11 AM

      Edited by: 881507 on Jan 18, 2013 4:13 AM