Servlet Help

**greekos_kentos** · April 6, 2005

I'm tring to create a servlet that will calculate numbers input by the user but i'm a little stuck.

This is what i have done so far

<HTML><HEAD><TITLE>Call servlet to Calculate numbers</TITLE></HEAD>

<BODY><H1>Calculator</H1>

<P><FORM ACTION="/servlet/Add" 
    METHOD=GET>

<P>First number : <INPUT TYPE=TEXT NAME=number1> 

<P>Second number : <INPUT TYPE=TEXT NAME=number2> 

<P>
<SELECT name=Action>
<OPTION value="" selected>- Select -</OPTION>
<OPTION value="+">Add</OPTION>
<OPTION value="-">Subtract</OPTION>
<OPTION value="/">Divide</OPTION>
<OPTION value="*">Times</OPTION>

</SELECT>

<P><INPUT TYPE=SUBMIT VALUE="Add the numbers">
</FORM>


</BODY>
</HTML>

// AdditionServlet.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Add extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res, HttpServletRequest req2)
    throws ServletException, IOException {
    res.setContentType("text/html");
    ServletOutputStream out = res.getOutputStream();

    out.println("<HTML><BODY>");
    out.println("We are pleased to inform you that the result " +
  "of your calculation is now ready:");
     
    String[] number1params = req.getParameterValues("number1");
    int number1 = Integer.parseInt(number1params[0]);
     
    String[] number2params = req.getParameterValues("number2");
    int number2 = Integer.parseInt(number2params[0]);
     
     String[] actionparams = req.getParameterValues("action");
    int action = Integer.parseInt(actionparams[0]);
     
     if (action == '+') {
    int sum = number1 + number2;
    out.println("<P>You kindly sent us the numbers " + number1 +
  " and " + number2);
    out.println("<P>The sum of the numbers is " + sum);
    out.println("</BODY></HTML>");
} else {
    out.println("<P> Wrong value");
    out.println("</BODY></HTML>");
}
     
     
    
  }

I'm getting the error "HTTP method GET is not supported by this URL"

Any ideas what i have done wrong??

**Taggs** · April 7, 2005

I've not done any programming for a while but this should point you towards the problem.

This error means that the servlet identified by the URL does not implement the 'doGet' method, as a result a HTTP GET request cannot be successful.

I hope this helps.

**matrix0978** · April 7, 2005

Yes, I have a php calculator script it you would like that instead if the java. I will post it only if youll like it

**greekos_kentos** · April 8, 2005

Thanks For the advice and the offer, but I've managed to get it all working now

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