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PrintWriter out = response.getWriter();
HttpSession session = ((HttpServletRequest)request).getSession();
if ( (String)session.getAttribute("cellphoneName")==null ){
out.print(" <script language='javascript' charset='gb2312'>window.alert('ÄúÉÐδѡÔñÊÖ»ú');history.go(-1); </script>");
}
chain.doFilter(request, response);
==============================================
web.xmlÀïÃæÊÇÕâôҲµÃ
<filter>
<filter-name>cellphoneNameExist </filter-name>
<filter-class>filter.CellphoneNameExist </filter-class>
</filter>
<filter-mapping>
<filter-name>cellphoneNameExist </filter-name>
<url-pattern>/cellphoneBuy.jsp </url-pattern>
</filter-mapping>
===============================================
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request.setCharacterEncoding("gb2312");
response.setCharacterEncoding("gb2312");
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