java hidden form field
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class First extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
//getting value submitted in form from HTML file
String user = request.getParameter("user");
//creating a new hidden form field
out.println("<form action='Second'>");
out.println("<input type='hidden' name='user' value='"+user+"'>");
out.println("<input type='submit' value='submit' >");
out.println("</form>");
}
}