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    ʹÓõ½javax.servlet.RequestDispatcherÀà
    RequestDispatcher rd = getServletContext().getRequestDispatcher("url");
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    forward·½·¨£¬ÒòΪÕâЩÕâÑù±È½Ï¸ßЧ¡£Ö»ÓÐÔÚforward·½·¨²»ÄÜʹÓÃʱ£¬ÔÙʹÓÃservletresponseµÄsendredirect()·½·¨¡£
(2).response.sendRedirect(url);  
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