检查用户是否已经登录或在jsp中启动了会话 [英] Checking if a user is already logged in or the session is started in jsp

问题描述

我正在尝试使用jsp设计一个简单的登录系统.在登录页面中，用户输入其用户名和密码，验证后将以该用户名和密码执行

I am trying to design a simple login system using jsp. In the login page, the user inputs his username and password which on verification gets executed as

if username and password combination exists, then
{

     HttpSession session = request.getSession(false);

     if (session == null) {
          // Session not created yet. So we do it now.
           session = request.getSession();
           session.setAttribute("id",idvariable );
           response.sendRedirect("home.jsp");
          // I redirect them to their profile home pages
    } 

    else {
        // Session is already created.
         response.sendRedirect("home.jsp");
       // So i again redirect them to their home page
    }
 }

---

现在在"home.jsp"中，如何检查会话是否已创建??

---

Now in the "home.jsp" how do i check if the session has already been created ??

* 我需要检查会话是否已经在配置文件中的每个页面上启动.所以我想创建某种可以在每个jsp页面顶部调用的函数*

我该怎么办??

推荐答案

使用JSP Prelude，它将jsp添加到所有jsps的开头.并检查会议是否已经存在.

Use JSP Prelude which adds the jsp to the begining of all jsps. And check if the sesion already exists.

参考:

• 显示了如何添加Jsp Prelude的示例

如何包含所有Jsps页面

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