Hi Friend,

Try the following code:

1)form.jsp:

<form method="post" action="../Data">
Enter Number:<input type="text" name="num" >
<input type="submit">
</form>

2)Data.java:

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

public class Data extends HttpServlet { 
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        String st=request.getParameter("num");
        int number=Integer.valueOf(st);
        out.println(number);
        }
        }