loginfilter.java~4~

宠物医院 JSP项目 我是一个初学者 请大家多多指教

package servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class LoginFilter extends HttpServlet implements Filter {
    private FilterConfig filterConfig;
    //Handle the passed-in FilterConfig
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    //Process the request/response pair
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
            HttpServletRequest rep = (HttpServletRequest)request;
            HttpSession session = rep.getSession();
                      HttpServletResponse httpresponse = (HttpServletResponse)response;
            if(!session.getAttribute("uname").equals("")){
                filterChain.doFilter(request, response);
            }
            else{
                request.setAttribute("message","此人还未登录！");
                //httpresponse.setHeader("refresh","2;url=jsp/login.jsp");
                request.getRequestDispatcher("jsp/login.jsp").forward(request,response);
            }
        } catch (ServletException sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }

    //Clean up resources
    public void destroy() {
    }
}