Question

我有以下代码，问题是out.println（“Clave =”+ request.getParameter（“clave”）+“。”）;写入null。我一直在这个论坛上寻找解决方案，但我找不到任何东西。

HTML：

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Registro de votante</title>
        <link href="estilos.css" rel="stylesheet" type="text/css">
    </head>
    <body>
        <form method="post" action="CreaVotante">
        <div id="reg">
            <table>
                <tr>
                    <td colspan="2">
                        <h1>Reg&iacute;strate para votar</h1>
                    </td>
                </tr>
                <tr>
                    <td>
                       <p>NIF</p> 
                    </td>
                    <td>
                        <input type="text" name="nif">
                    </td>
                </tr>
                <tr>
                    <td>
                        <p>Clave</p>
                    </td>
                    <td>
                        <input type="text" name="clave">
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <input type="submit" name="registro">
                    </td>
                </tr>
            </table>
        </div>
        </form>
    </body>
</html>

的Servlet

package Controlador;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Lux
 */
public class CreaVotante extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet CreaVotante</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Nif= " +request.getParameter("nif")+ "</h1>");
            out.println("<h1>Clave= " +request.getParameter("clave")+ "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }
}

request.getParameter在servlet

0 个答案: