使用 servlet 通过 2 个表单发送变量

Question

我遇到了 2 个 servlet 的问题。基本上我有1个带有表单的jsp页面，当我点击提交时，我需要从这个jps中获取所有变量，以便将它们注入第二个页面（输入类型=“隐藏”），最后一起提交。

我的 servlet 1（添加客户端）

    @Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    System.out.println("salut 1  ");
    request.getRequestDispatcher("/JSP/Template/BankAdvisor/AddClient.jsp").forward(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String firstname = request.getParameter("firstname");
    String lastname = request.getParameter("lastname");
    String email = request.getParameter("email");
    String address = request.getParameter("address");
    String city = request.getParameter("city");
    String zipcode = request.getParameter("zipcode");
    String phone = request.getParameter("phone");

    if (firstname != null && lastname != null && email != null && address != null && city != null && zipcode != null && phone != null) {

        if (!lastname.isEmpty() && !firstname.isEmpty() && !email.isEmpty() && !address.isEmpty() && !city.isEmpty() && !zipcode.isEmpty() && !phone.isEmpty()) {

            request.setAttribute("firstname", firstname);
            request.setAttribute("lastname", lastname);
            request.setAttribute("email", email);
            request.setAttribute("address", address);
            request.setAttribute("city", city);
            request.setAttribute("zipcode", zipcode);
            request.setAttribute("phone", phone);
            request.getRequestDispatcher("/BankAdvisor/AddAccount").forward(request, response);

        } else {

            response.sendRedirect(getServletContext().getContextPath() + "/BankAdvisor/AddClient");
        }

    } else {

        response.sendRedirect(getServletContext().getContextPath() + "/BankAdvisor/AddClient");
    }

}

我的 servlet 2（添加帐户）

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    request.getRequestDispatcher("/JSP/Template/BankAdvisor/AddAccount.jsp").forward(request, response);
    String firstname = request.getParameter("firstname");
    String lastname = request.getParameter("lastname");
    String email = request.getParameter("email");
    String address = request.getParameter("address");
    String city = request.getParameter("city");
    String zipcode = request.getParameter("zipcode");
    String phone = request.getParameter("phone");
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String firstname = request.getParameter("firstname");
    String lastname = request.getParameter("lastname");
    String email = request.getParameter("email");
    String address = request.getParameter("address");
    String city = request.getParameter("city");
    String zipcode = request.getParameter("zipcode");
    String phone = request.getParameter("phone");

    //The two news variables
    String accountName = request.getParameter("accountname");
    String accountType = request.getParameter("accounttype");

    if (firstname != null && lastname != null && email != null && address != null && city != null && zipcode != null && phone != null) {

        if (!lastname.isEmpty() && !firstname.isEmpty() && !email.isEmpty() && !address.isEmpty() && !city.isEmpty() && !zipcode.isEmpty() && !phone.isEmpty()) {

         // ACTION 
        } else {
            response.sendRedirect(getServletContext().getContextPath() + "/BankAdvisor/AddClient");
        }

   } else {
 response.sendRedirect(getServletContext().getContextPath() + "/BankAdvisor/AddClient");
   }
}

谢谢

Answer 1

在 servlet 1 中，您应该使用 :

getServletContext().getRequestDispatcher("/BankAdvisor/AddAccount").forward(request, response);

而不是 :

request.getRequestDispatcher("/BankAdvisor/AddAccount").forward(request, response);

因为 ServletRequest#getRequestDispatcher(java.lang.String)，如果路径以“/”开头，则被解释为相对于当前路径上下文根（即当前请求的上下文路径）。

• 示例：如果您在 http://test/myapp/toto 上收到请求，它将转发到 http://test/myapp/toto/BankAdvisor/AddAccount

而ServletContext#getRequestDispatcher(java.lang.String) 路径被解释为相对于当前上下文根（即当前 Web 应用程序的上下文路径）。

• 示例：如果您在 http://test/myapp/toto 上收到请求，如果 web 应用程序上下文，它将在 http://test/myapp/BankAdvisor/AddAccount 上转发根目录是http://test/myapp