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Thread: Using html Radio Buttons with Servlets

  1. #1
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    Default Using html Radio Buttons with Servlets

    Hello all,

    I'm working through some examples of java servlets. I have one example of a servlet taking text input, the lines of code I have an example of are below, this example uses a html text area to submit input:

    String text = req.getParameter("text");
            String translation = translate(text);
            res.setContentType("text/html");
            ServletOutputStream out = res.getOutputStream();

    I am doing my own example working with html radio buttons and was thinking of altering the code to how it is below, my questions concern mainly the first 4 lines:

    String colour = req.getParameter("colour");
            res.setContentType("radio/html");
            ServletOutputStream out = res.getOutputStream();
    		out.println("<html>");
    			out.println("<body>");
    			out.println("<head><title>Change Colour</title></head>");
    			out.println("<h1><p>Background Colour</p></h1>");
    			out.println("<p>What colour do you want the background?</p>");
    			out.println("<form>");
    			out.println("Yellow <input type=\"radio\" name=\"colour\" value=\"Yellow\" /> </br>");
    			out.println("Green <input type=\"radio\" name=\"colour\" value=\"Green\" /> </br>");
    			out.println("Blue <input type=\"radio\" name=\"colour\" value=\"Blue\" /> </br>");
    			out.println("<input type=submit value=\"Change Background\"/>");
    			out.println("</form>");
    			out.println("</body>");
    			out.println("</html>");

    All I would like to know is am I passing the correct parameter into the HttpServletResponse method getParameter()? Colour is the name of the radio button group. Am I write in making the object a string? Finally once I get the parameter will I be able to check against it if (colour == "Yellow") for example. Any help much appreciated.
    Last edited by oss_2008; June 25th, 2009 at 04:26 AM.


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: Using html Radio Buttons with Servlets

    Hello oss_2008,

    I have moved this thread over to the Java Servlet forum:

    Java Servlet - Java Programming Forums

    That all looks good to me. Yes I think it will be OK to declare colour as a String. Are you getting any errors?

    Rather than:

    if(colour == "Yellow")

    I think you will need to use:

    if(colour.equals("Yellow"))
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: Using html Radio Buttons with Servlets

    Thank you for your help. I'm not getting any errors as I haven't compiled it yet. I was just checking I had understood the concept correctly.

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