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我在我的登录应用程序中使用过滤器。我想要一些只有管理员才能访问的页面。我将这些页面保存在管理文件夹中，并在我的项目中实现了过滤器。但是其他用户仍然可以通过 URL 访问页面。

我哪里错了？

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.
    }

}
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1 回答 1

2

理论上有两个可能的原因：

  • 过滤器根本不运行
  • 过滤器不保护应用程序的页面。

我知道这听起来微不足道，但你能指定过滤器是否运行，如果是，你会来 chain.doFilter(req,res) 吗？

于 2012-09-22T06:27:04.460 回答