Question

我遇到了一个相对简单的问题。我正在尝试做一个简单的程序，您可以使用该会话登录和注销。会话已创建，但我总是转发到面板servlet，然后转到NoCorrectSession页面。好像在登录页面上，服务器看到isActive属性，然后在面板页面上没有。

//class Login extends HttpServlet
private RequestDispatcher pageLogin, pagePanel, pageError; //defined in init()

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    HttpSession session = request.getSession();
    String name = request.getParameter("name");
    String isBeingRequested = request.getParameter("isBeingRequested");
    if (session.getAttribute("isActive") != null) {
        //user has been logged in before, redirect him
        pagePanel.forward(request, response);
    } else if (isBeingRequested != null) {
        //user has entered data into the login page and submitted it            
        if (name.length() == 0) {
            //user has not stated his name
            pageError.forward(request, response);
        } else {
            //otherwise access is granted and account created 
            session.setAttribute("isActive", "yes");   //setting session to active
            pagePanel.forward(request, response);
        }
    } else {
        //neither of these? user just entered the login screen
        pageLogin.forward(request, response);
    }
}

//class Panel extends HttpServlet {
private RequestDispatcher pageNoCorrectSession;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    HttpSession session = request.getSession();
    //session has expired or never was started
    if (session.getAttribute("isActive") == null) {
        pageNoCorrectSession.forward(request, response);
    //session valid
    } else {
        //logged in - do stuff
    }

Answer 1

在挖掘项目之后，事实证明我在这些servlet中没有犯错，但在HTML代码中导致将表单直接提交给面板servlet（而不是在过程中创建帐户对象）。我知道这很愚蠢，但这是一个很好的教训。期待意外：P

会话属性迷失

1 个答案: