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我将尝试解释我的问题。我有一个 login.jsp，在其中填写用户名和密码并将其发送到 servlet，该 servlet 检查数据库以及是否正确调用 userLogged.jsp，如果不正确则发送到 invalidLogin.jsp。这很好用，即使我获得了 userlogged.jsp，我也可以检索我在 servlet 中创建的会话数据。Userlogged.jsp 创建一个包含三个部分的 html 页面，一个按钮继续，一个表单更改密码和一个横幅。然后当我单击按钮继续时，我调用了 servlet，但在这里我无法获取会话，总是为空。当我单击按钮时如何将会话信息传递给 servlet？我粘贴代码，如果您需要更多信息，请告诉我。谢谢你。

伺服器

    private void getLogin(HttpServletRequest request, HttpServletResponse response, DataAccessUtils dao) throws ServletException, IOException
{
    String userName = request.getParameter("username");
    String userPassword = request.getParameter("password");

            // DATABASE ACCESS
    Login login = new Login();
    String[] currentUser = login.validateLogin(userName, userPassword, dao);

    if (!currentUser[0].equals("-1"))
    {                 
        String nextJSP = "/actions/userLogged.jsp";
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(nextJSP);

        HttpSession session = request.getSession(true);     
        session.setAttribute("username", currentUser[0]);                   
        session.setAttribute("agencyname", currentUser[1]);
        session.setAttribute("branchname", currentUser[2]);
        session.setAttribute("currenttravelfile", "N/A");

        dispatcher.forward(request,response);
    }                   
    else
    {
        response.sendRedirect("actions/invalidLogin.jsp"); //error page 
    }
}

private void getGoToMenu(HttpServletRequest request, HttpServletResponse response, DataAccessUtils dao) throws ServletException, IOException
{
    // HERE ALWAYS IS NULL  
    String username = (String)request.getSession().getAttribute("username");

    String nextJSP = "/actions/menu.jsp";       
    RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(nextJSP);
    dispatcher.forward(request,response);
}

USERLOGGED.jsp（仅我调用 servlet 的部分）

            <form action="./getjsprequestservlet" method="post" id="userlogged-form">       
            <fieldset>
                <div style="margin-bottom:1em; margin-left: 11em;">     
                    <input type=hidden name=action id=opr value="gotomenu"/>
                    <input type="submit" value="Go To Menu" class="button round blue image-right ic-right-arrow"></input>
                </div>


                <div class="information-box round">
                    <input type=hidden name=action id=opr value="change-password"/>
                    <p>
                        <label class="title">Change Password</label>
                        <label>Current Password</label>                 
                        <input type="password" name="password" id="login-password" class="round full-width-input" />
                        <label>New Password</label>                 
                        <input type="password" name="password" id="login-password" class="round full-width-input" />
                        <label>Confirm New Password</label>                 
                        <input type="password" name="password" id="login-password" class="round full-width-input" />
                        <input type="submit" value="Change" class="button round blue image-right ic-right-arrow"></input>
                    </p>
                </div>
            </fieldset> 
        </form> 

        <div class="banner-box round">
            <label class="alt-label">Sponsored links </label>
            <table id="raw">
                <tr>
                    <td>                    
                        <a href="#" class="fr"><img src="./images/test.gif"/></a>
                    </td>
                    <td>
                        <a href="#" class="fr"><img src="./images/test2.gif"/></a>
                    </td>
                    <td>
                        <a href="#" class="fr"><img src="./images/test3.gif"/></a>
                    </td>
                </tr>
            </table>                                        
        </div>      
    </div> <!-- end content -->
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