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java代码: package com.unionx.wanxue.utils; 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; import com.unionx.wanxue.domains.UserServiceDTD; public class LoginFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO Auto-generated method stub  HttpServletRequest httprequest = (HttpServletRequest)request;    HttpServletResponse httpresponse = (HttpServletResponse)response;    HttpSession session = httprequest.getSession();    UserServiceDTD userInfo =(UserServiceDTD)session.getAttribute("userinfo");    String uri = httprequest.getRequestURI(); //assets，css,lib等url不过滤    if(uri.contains("/assets/")){     chain.doFilter(request, response);    }else if(uri.contains("/css/")){     chain.doFilter(request, response);    }else if(uri.contains("/lib/")){     chain.doFilter(request, response);    }else if(uri.contains("/js/")){     chain.doFilter(request, response);    }else if(uri.contains("/login")){     chain.doFilter(request, response);    }else if(uri.contains("/skin")){     chain.doFilter(request, response);    }    else if(uri.contains("/images/")){     chain.doFilter(request, response);    }    else if(uri.contains("/cc/")){     chain.doFilter(request, response);    }    else{         if(userInfo==null){         httprequest.setAttribute("info", "helloword!");     httprequest.getRequestDispatcher("/login.jsp").forward(httprequest, httpresponse);     }else{     chain.doFilter(request, response);     }    }    // http://localhost:8080/meeting/servlet } @Override public void destroy() { // TODO Auto-generated method stub } } web.xml配置     LoginFilters     com.unionx.wanxue.utils.LoginFilter     LoginFilters     /*

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