java.lang.IllegalStateException: getOutputStream() has already been called for this response
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今天写一个将数据导出到excel中,然后在提示下载文件,然后就出现了下边错误:
java.lang.IllegalStateException: getOutputStream() has already been called for this response。
查了下说是:在释放在jsp中使用的对象,会调用response.getWriter(),所以和response.getOutputStream()相冲突的,所以会出现以上这个异常。
但是我没有在jsp中应用到这个方法.
最终想通了:原来是因为Action的每个方法都会返回一个ActionForward对象,而response是ActionForward对象参数,所以就会使response冲突!所以处理下传的action返回null就可以了,最终我把action里的最后 “return “” ” 改成了 “return null ”,没有问题了
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