Filter-四个有用的Java过滤器

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1、四个有用的Java过滤器java代码一、使浏览器不缓存页面的过滤器packagecom.sist;importjavax.servlet.*;importjavax.servlet.http.HttpServletResponse;importjava.io.IOException;/***用于的使Browser不缓存页面的过滤器*/publicclassForceNoCacheFilterimplementsFilter{publicvoiddoFilter(ServletRequestrequest,ServletResponseresp

2、onse,FilterChainfilterChain)throwsIOException,ServletException{((HttpServletResponse)response).setHeader("Cache-Control","no-cache");((HttpServletResponse)response).setHeader("Pragma","no-cache");((HttpServletResponse)response).setDateHeader("Expires",-1);filterChain.doFilt

3、er(request,response);}}二、检测用户是否登陆的过滤器packagecom.sist;importjavax.servlet.*;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;importjava.util.List;importjava.util.ArrayList;importjava.util.StringToke

4、nizer;importjava.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*/publicclassCheckLoginFilterimplementsFilter{privateStringredirec

5、tURL=null;privateListnotCheckURLList=newArrayList();privateStringsessionKey=null;publicvoiddoFilter(ServletRequestservletRequest,ServletResponseservletResponse,FilterChainfilterChain)throwsIOException,ServletException{HttpServletRequestrequest=(HttpServletRequest)servletReq

6、uest;HttpServletResponseresponse=(HttpServletResponse)servletResponse;HttpSessionsession=request.getSession();if(sessionKey==null){filterChain.doFilter(request,response);return;}if((!checkRequestURIIntNotFilterList(request))&&session.getAttribute(sessionKey)==null){response

7、.sendRedirect(request.getContextPath()+redirectURL);return;}filterChain.doFilter(servletRequest,servletResponse);}publicvoiddestroy(){notCheckURLList.clear();}privatebooleancheckRequestURIIntNotFilterList(HttpServletRequestrequest){Stringuri=request.getServletPath()+(reques

8、t.getPathInfo()==null?"":request.getPathInfo());returnnotCheckURLList.contains(uri