java.lang.IllegalStateException: getOutputStream() has already been called for t
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下载文件时，一不小心，就会经常报下面的异常：
java.lang.IllegalStateException: getOutputStream() has already been called for t
解决方法：
由于jsp container在处理完成请求后会调用releasePageContet方法释放所用的PageContext object,并且同时调用getWriter方法,由于getWriter方法与在jsp页面中使用流相关的getOutputStream方法冲突,所以会造成这种异常,
解决办法是:只需要在jsp页面的最后加上两条语句:
out.clear();out=pageContext.pushBody();
即可(其中out,pageContext均为jsp内置对象!)
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