Java Filter

四种实用的JAVA过滤器

java 代码
一、使浏览器不缓存页面的过滤器     

 import  javax.servlet.*;
 import  javax.servlet.http.HttpServletResponse;
 import  java.io.IOException;

 /**
 * 用于的使 Browser 不缓存页面的过滤器
 */
 public   class  ForceNoCacheFilter  implements  Filter {

 public   void  doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)  throws  IOException, ServletException
 {
     ((HttpServletResponse) response).setHeader( "Cache-Control" , "no-cache" );
     ((HttpServletResponse) response).setHeader( "Pragma" , "no-cache" );
     ((HttpServletResponse) response).setDateHeader ( "Expires" , - 1 );
     filterChain.doFilter(request, response);
 }

 public   void  destroy()
 {
 }

        public   void  init(FilterConfig filterConfig)  throws  ServletException
 {
 }
 }

 

 

二、检测用户是否登陆的过滤器    

 import  javax.servlet.*;
 import  javax.servlet.http.HttpServletRequest;
 import  javax.servlet.http.HttpServletResponse;
 import  javax.servlet.http.HttpSession;
 import  java.util.List;
 import  java.util.ArrayList;
 import  java.util.StringTokenizer;
 import  java.io.IOException;

 /**
 * 用于检测用户是否登陆的过滤器，如果未登录，则重定向到指的登录页面


 * 配置参数


 * checkSessionKey 需检查的在 Session 中保存的关键字

 * redirectURL 如果用户未登录，则重定向到指定的页面，URL不包括 ContextPath

 * notCheckURLList 不做检查的URL列表，以分号分开，并且 URL 中不包括 ContextPath

 */
 public   class  CheckLoginFilter
 implements  Filter
 {
        protected  FilterConfig filterConfig =  null ;
        private  String redirectURL =  null ;
        private  List notCheckURLList =  new  ArrayList();
        private  String sessionKey =  null ;

 public   void  doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)  throws  IOException, ServletException
 {
     HttpServletRequest request = (HttpServletRequest) servletRequest;
     HttpServletResponse response = (HttpServletResponse) servletResponse;

      HttpSession session = request.getSession();
      if (sessionKey ==  null )
     {
      filterChain.doFilter(request, response);
       return ;
     }
      if ((!checkRequestURIIntNotFilterList(request)) && session.getAttribute(sessionKey) ==  null )
     {

padding-top: 0px !important; padding-right: 3px !important; padding-bottom: 0px !important; padding-left: 10px !important; font-family: Verdana, Georgia, Arial, Helvetica, sans-serif; border-top-style: none

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Struts2 | iBATIS

• 2011-03-31 14:27
• 浏览 265
• 评论(0)
• 分类:编程语言
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