java.lang.IllegalStateException: getOutputStream() has already been called for this response
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在ssh的验证码，ServletOutputStream s = ServletActionContext.getResponse()
.getOutputStream();
发现这个问题，网上找了好久
action 返回null是正解
参考：http://www.360doc.com/content/12/0612/13/1967709_217660151.shtml
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