调用其他servlet时更改url

Question

我有2个servlet：登录和管理员。登录后，我想去管理页面。

登录

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    if ("admin".equals(username)) {
        RequestDispatcher requestDispatcher= request.getRequestDispatcher("/admin");
        request.setAttribute("param1", "value1");
        request.setAttribute("param2", "value2");
        requestDispatcher.forward(request, response);
    }
}

管理

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    RequestDispatcher requestDispatcher = request.getRequestDispatcher("/WEB-INF/pages/admin.jsp");
    requestDispatcher.forward(request, response);
}

结果是

  

http://localhost:8080/app-servlets/login

我想要什么

  

http://localhost:8080/app-servlets/admin

网址未更改的原因是我使用转发。但我想将一些参数传递给jsp页面，所以在这种情况下我不能使用 sendRedirect 。

我该怎么办？

Answer 1

在HttpSession中存储您需要的属性：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    if ("admin".equals(username)) {
        HttpSession session = request.getSession();
        session.setAttribute("param1", "value1");
        session.setAttribute("param2", "value2");
        response.sendRedirect("/admin");
    }
}

这些属性可以在JSP中访问＆＃34; admin＆＃34; doGet(...)转发，网址栏将包含所需内容：

  

http://localhost:8080/app-servlets/admin