src/filter/AdminFilter.java

微信扫码关注公众号，代码整理好后第一时间通知你。

package filter;

import model.User;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "AdminFilter",urlPatterns = "/admin/*")
public class AdminFilter implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)resp;
        User u = (User) request.getSession().getAttribute("user");
        if(u==null || u.isIsadmin()==false) {
            response.sendRedirect("/index");
        }else {
            // pass the request along the filter chain
            chain.doFilter(req, resp);
        }
    }

    public void init(FilterConfig config) throws ServletException {

    }

}