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1.Ê×ÏÈдһ¸öȨÏÞ¹ýÂËfilterÀà,ʵÏÖFilter½Ó¿Ú
/*Ê×ÏÈдһ¸öȨÏÞ¹ýÂËfilter*/
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
public class RightFilter
    implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response,
                       FilterChain chain) throws IOException, ServletException {
    HttpServletRequest req = (HttpServletRequest) request;
    HttpServletResponse res = (HttpServletResponse) response;
   
    HttpSession session = req.getSession(true);
    String path = req.getRequestURI();
    //´ÓsessionÀïÈ¡µÄÓû§ÃûÐÅÏ¢
    String username = (String) session.getAttribute("username");
for (int i = 0; i < Constants.NoFilter_Pages.length; i++) {
   if (path.indexOf(Constants.NoFilter_Pages[i]) > -1) {
    chain.doFilter(req, res);
    return;
   }
}
   
    //ÅжÏÈç¹ûûÓÐÈ¡µ½Óû§ÐÅÏ¢,¾ÍÌøתµ½µÇ½ҳÃæ
    if (username == null || "".equals(username)) {
      //Ìøתµ½µÇ½ҳÃæ
      res.sendRedirect(" http://"+req.getHeader("Host")+"/login.jsp ");//ÕâÀïÊÇ·µ»ØÓòÃûµÄ¸ùĿ¼µØÖ·£¬ÈôÖ±½Ó·µ»Øµ±Ç°µÄĿ¼ÏµÄÎļþ£¬ÔòÓÃres.sendRedirect("/login.jsp")
    }
    else {
      //ÒѾ­µÇ½,¼ÌÐø´