如何检查使用过滤器授权的用户 [英] How to check user authorized with filter

问题描述

我有一个过滤器和登录 Servlet.我如何检查 - 授权用户与否?如果没有授权 - 将他重定向到登录 Servlet.

I have a filter and Login Servlet. How i can check - authorized user or not? and if not authorized - to redirect him to Login Servlet.

谢谢.

推荐答案

这样做:

1. 当用户登录时，在 HttpSession 中为该用户设置 User 对象.这样，httpRequest.getSession().setAttribute("LOGGED_USER", userObject)

现在，每次您点击过滤器/安全过滤器.您要做的第一件事是检查此属性.

Now, every time you hit the filter/security filter. The first thing you do is check for this attribute.

如果该属性不存在，则将请求重定向/转发到登录 servlet.

If the attribute is not there, redirect/forward the request to login servlet.

伪代码如下所示:

//in your login servlet, on successful login
request.getSession().setAttribute("LOGGED_USER", userObject);

//in your security filter
if(request.getSession().getAttribute("LOGGED_USER") == null){
//optionally, you may like to check if that attribute has a valid userId as well
     RequestDispatcher rd = request.getRequestDispatcher("relative/path/to/login/servlet")
     rd.forward(request, response);
     return;
}

<小时>

编辑 1: 看到这个 http://download.oracle.com/javaee/5/tutorial/doc/bncbx.html

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