Excel导出时，后台抛出getOutputStream() has already been called for this response异常
2017-03-23 14:08
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在做Excel导出时，后台抛出getOutputStream() has already been called for this response异常，导出的Excel表格正常，但是异常让人看着很不爽，于是找了一下，发现在Action中返回null时可以解决这个问题。
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