The method setCharacterEncoding(String) is undefined for the type HttpServletResponse 是什么原因？
response.setCharacterEncoding("gb2312"); 在Servlet2.3中是不行的，至少要2.4版本才可以，如果低于2.4版本，可以用如下办法：
response.setContentType("text/html;charset=gb2312");
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