问题其实已经很明确了，说明就是不能重定向，因为已经有response了。

然后一检查，是前面已经用servlet的printWriter打印东西了。

所以，重定向前

必须先保证没有任何的输出，包括：
1、Cookie；
2、resp.getWriter()写文本信息;
3、已经发送过重定向。

重点检查下这些问题吧，如果你写了Filter，或者Servlet已经做过forward，也要注意看看。

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