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    ʹÓõ½javax.servlet.RequestDispatcherÀà
    RequestDispatcher rd = getServletContext().getRequestDispatcher("url");
    rd.forward(requestVar,requestVar); //´«µÝservletµÄÈë¿Ú²ÎÊý
    /*forwardº¯ÊýÒѾ­°ÑÔ­Ò³ÃæµÄrequest,response¶ÔÏó´«ÈëеÄÒ³Ãæ£¬Òò´ËÕâоÉÒ³ÃæÓµÓÐÏàͬµÄrequest,response¶ÔÏó¡£request.getparameter("var")¾Í¿ÉÒԵõ½ÏàÓ¦µÄÖµ.*/
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    ¼´£º
    getServletContext().getRequestDispatcher("url").forward(requestVar,responseVar);
    ·þÎñÆ÷¶ËServlet½øÐÐתÏòµÄ4ÖÖ·½·¨£º
    1.ServletContextµÄgetRequestDispatcher()    
    2.ServletContextµÄgetNamedDispatcher()   
    3.ServletRequestµÄgetRequestDispatcher()   
    4.ServletResponseµÄsendredirect()½øÐÐתÏò¡£
    forward·½·¨£¬ÒòΪÕâЩÕâÑù±È½Ï¸ßЧ¡£Ö»ÓÐÔÚforward·½·¨²»ÄÜʹÓÃʱ£¬ÔÙʹÓÃservletresponseµÄsendredirect()·½·¨¡£
(2).response.sendRedirect(url);  
    ÆäʵÊÇÏòä¯ÀÀÆ÷·¢ËÍÒ»¸öÌØÊâµÄHeader£¬È»ºóÓÉä¯ÀÀÆ÷À´×öתÏò£¬×ªµ½Ö¸¶¨µÄÒ³Ãæ£¬ËùÒÔÓÃsendRedirectʱ£¬ä¯ÀÀÆ÷µÄµØÖ·À¸ÉÏ¿ÉÒÔ¿´µ½µØÖ·µÄ±ä»¯¡£ÐÂÒ³Ãæ²»ÄÜ´¦Àí¾ÉÒ³ÃæµÄpagecontext(request,response,...)¶ÔÏó.
    ÔÚresponse.sendRedirectÖ®ºó£¬Ó¦¸Ã½ô¸úÒ»¾äreturn;
(3).HTMLÓïÑÔµÄ×Ô¶¯Ìø×ª
    <html>
    <head>
        <meta http-equiv="refresh" content="0;url="http://www.baidu.com">
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    </head>
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(4).JavaScriptÌø×ª
A:    <script languate="javascript">
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clock();
function clock()
{
   window.setTimeout('clock()',1000);
   times=times-1;
   time.innerHTML =times;
}
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<%@ page import="java.io.*" %>
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