The method setCharacterEncoding(String) is undefined for the type HttpServletResponse

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本文参考：http://zhidao.baidu.com/question/212618937.html

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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