使用token 防止struts2刷新重复提交时 Exception occurred during processing request: null
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把action继承ActionSupport，这样这个问题就可以解决了。估计只有继承ActionSupport，token的拦截器才会起作用吧。
参考：http://bbs.csdn.net/topics/390385886
http://www.iteye.com/topic/399518
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