java hidden form field

1import java.io.*;
2import javax.servlet.*;
3import javax.servlet.http.*;
4
5public class First extends HttpServlet {
6
7  protected void doPost(HttpServletRequest request, HttpServletResponse response)
8            throws ServletException, IOException {
9        response.setContentType("text/html;charset=UTF-8");
10        PrintWriter out = response.getWriter();
11        
12	//getting value submitted in form from HTML file
13        String user = request.getParameter("user");
14        
15        //creating a new hidden form field
16        out.println("<form action='Second'>");
17        out.println("<input type='hidden' name='user' value='"+user+"'>");
18        out.println("<input type='submit' value='submit' >");
19        out.println("</form>");
20    }
21}
22