Java 从JSP向Servlet传递的数据在Servlet中返回null

您使用的

location.href='passtopayment'

不是提交表单的正确方式

这就像对Servlet的单独请求一样，不会向Servlet发送任何内容

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

您应该使用

表单

并将请求提交到Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

---

这里详细介绍了您使用的

位置。href='passtopayment'

提交表单的方式不正确

这就像对Servlet的单独请求一样，不会向Servlet发送任何内容

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

您应该使用

表单

并将请求提交到Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

---

这里详细介绍了您使用的

位置。href='passtopayment'

提交表单的方式不正确

这就像对Servlet的单独请求一样，不会向Servlet发送任何内容

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

您应该使用

表单

并将请求提交到Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

---

这里详细介绍了您使用的

位置。href='passtopayment'

提交表单的方式不正确

这就像对Servlet的单独请求一样，不会向Servlet发送任何内容

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

您应该使用

表单

并将请求提交到Servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    String ac = request.getParameter("ac");
    String deluxe = request.getParameter("deluxe");

    out.println(ac);
    out.println(deluxe);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

---

下面是详细的

要提交到服务器端的

表单

标记在哪里？您如何将请求参数提交到Servlet？我不确定您的逻辑（td的名称）将如何工作。此外，您正在迭代列表

myrooms

。所以可能有n行。因此，您无法使用

request.getParameter

接收这些值，并将其放入

String

数据类型。要提交到服务器端的

form

标记在哪里？您如何将请求参数提交到Servlet？我不确定您的逻辑（td的名称）将如何工作。此外，您正在迭代列表

myrooms

。所以可能有n行。因此，您无法使用

request.getParameter

接收这些值，并将其放入

String

数据类型。要提交到服务器端的

form

标记在哪里？您如何将请求参数提交到Servlet？我不确定您的逻辑（td的名称）将如何工作。此外，您正在迭代列表

myrooms

。所以可能有n行。因此，您无法使用

request.getParameter

接收这些值，并将其放入

String

数据类型。要提交到服务器端的

form

标记在哪里？您如何将请求参数提交到Servlet？我不确定您的逻辑（td的名称）将如何工作。此外，您正在迭代列表

myrooms

。所以可能有n行。因此，您无法使用

request.getParameter

接收这些值，并将其放入

String

datatype中。此外，

doPost

和

doGet

不应具有相同的行为。此外，

doPost

和

doGet

不应具有相同的行为。此外，

doPost

和

doGet

也不应具有相同的行为。