受登录过滤器限制的页面仍可被其他用户访问 [英] Pages restricted by login filter are still accessible by other users

问题描述

我在登录应用程序中使用过滤器.我只想要一些页面 由管理员访问.我已经将这些页面保存在admin文件夹中， 在我的项目中实施了过滤器.但是页面仍然可以访问 通过其他用户的URL.

I am using Filters in my login application. I want some pages only accessed by admin. I have kept those pages in admin folder and implemented filters in my project. But pages are still accessible through URL by other users.

我要去哪里错了?

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class LoginFilter implements Filter {

    @Override
    public void init(FilterConfig config) throws ServletException {
        // If you have any <init-param> in web.xml, then you could get them
        // here by config.getInitParameter("name") and assign it as field.
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession(false);

        if (session == null || session.getAttribute("user") == null) {
            response.sendRedirect(request.getContextPath() + "/Login.xhtml"); // No logged-in user found, so redirect to login page.
        } else {
            chain.doFilter(req, res); // Logged-in user found, so just continue request.
        }
    }

    @Override
    public void destroy() {
        // If you have assigned any expensive resources as field of
        // this Filter class, then you could clean/close them here.
    }

}

推荐答案

从理论上讲，有两个可能的原因:

Theoretically there are 2 possible reasons for this:

• 过滤器根本不运行
• 过滤器不保护应用程序的页面.

我知道这听起来很简单，但是您能否指定过滤器是否完全运行，如果可以，您是否要使用chain.doFilter(req，res)?

I know it sounds trivially but could you specify whether the filter runs at all, and if yes, do you come to chain.doFilter(req,res) ?

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