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

/**
* ÓÃÓÚµÄʹ Browser ²»»º´æÒ³ÃæµÄ¹ýÂËÆ÷
*/
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
{
}
}      
  
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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;

/**
* ÓÃÓÚ¼ì²âÓû§ÊÇ·ñµÇ½µÄ¹ýÂËÆ÷£¬Èç¹ûδµÇ¼£¬ÔòÖض¨Ïòµ½Ö¸µÄµÇ¼ҳÃæ
* ÅäÖòÎÊý
* checkSessionKey Ðè¼ì²éµÄÔÚ Session Öб£´æµÄ¹Ø¼ü×Ö
* redirectURL Èç¹ûÓû§Î´µÇ¼£¬ÔòÖض¨Ïòµ½Ö¸¶¨µÄÒ³Ã棬URL²»°üÀ¨ ContextPath
* notCheckURLList ²»×ö¼ì²éµÄURLÁÐ±í£¬ÒԷֺŷֿª£¬²¢ÇÒ URL Öв»°üÀ¨ 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 filterC