如何验证/无效会话 jsp/servlets? [英] How to validate/invalidate sessions jsp/servlets?

问题描述

当用户成功登录时，我在我的 servlet 中打开了会话:

HttpSession session = request.getSession(true);session.setAttribute("name", name);

然后我在logout.jsp中写了终止会话:

<%session.invalidate();%>

要检查会话是否有效，我正在这样做:

HttpSession session = request.getSession();String name = (String) session.getAttribute("name");

但它不起作用，即使在 session.invalidate 之后我也使会话有效.有人明白我哪里做错了吗?

解决方案

你应该调用 session.getSession(false) - 如果没有当前会话，它返回 null.

根据文档<块引用>

HttpSession#getSession(boolean create) - create - 必要时为这个请求创建一个新的会话；如果没有当前会话，则返回 null.

所以会话值检查的正确方法是 -

HttpSession session = request.getSession(false);如果(会话！=空)session.setAttribute("name", name);

一旦你使会话无效 -

HttpSession session = request.getSession(false);如果(会话！=空)session.invalidate();

I opened the session in my servlet when the user performed a successful login:

HttpSession session = request.getSession(true);
session.setAttribute("name", name);

then I wrote in the logout.jsp to terminate the session:

<%session.invalidate();%>

To check if a session is valid I am doing this:

HttpSession session = request.getSession();
String name = (String) session.getAttribute("name");

But it is not working, I am getting the session valid even after the session.invalidate. Does anyone understand where am I doing wrong?

解决方案

you should call session.getSession(false) - which returns null if there is no current session.

according to docs

HttpSession#getSession(boolean create) - create - true to create a new session for this request if necessary; false to return null if there's no current session.

So the correct way of session value check would -

HttpSession session = request.getSession(false);
if(session!=null)
  session.setAttribute("name", name);

and once you invalidate the session -

HttpSession session = request.getSession(false);
if(session!=null)
session.invalidate();

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