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public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
          response.setContentType("text/html; charset=gb2312");
          ServletContext sc = getServletContext();
          RequestDispatcher rd = null;
          rd = sc.getRequestDispatcher("/index.jsp");       //¶¨ÏòµÄÒ³Ãæ
          rd.forward(request, response);
}
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public void doPost(HttpServletRequest request,HttpServletResponse response)
          throws ServletException,IOException
{
          response.setContentType("text/html; charset=gb2312");
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