adminfilter.java~8~

梅花雪树的经典制作

package myfirstweb;

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

public class AdminFilter 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 hsr = (HttpServletRequest)request;
            HttpServletResponse hsp = (HttpServletResponse)response;
            if(hsr.getSession().getAttribute("username")==null){
                hsp.sendRedirect("/error");
            }else{
                filterChain.doFilter(request, response);
            }
        } catch (ServletException sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }

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