java.lang.IllegalStateException: getOutputStream() has already been called for this response
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在jsp或者在servlet中有时要用到response.getOutputStream()，但是此时会在后台报这个错误java.lang.IllegalStateException: getOutputStream() has already been called for this respons，这问题困扰了我好久都没解决，最近这个项目中我又遇到了，下定决心一定要解决掉，最后终于让我给找到解决的方法了，这个异常时因为response.getOutputStream()跟response.getWriter()相冲突早场的，呵呵！现在记录下，发出来和大家共享下，希望能帮到遇到同样问题的朋友们，解决方法如下：
out.clearBuffer();
out = pageContext.pushBody();
在调用response.getOutputStream()之前加上上面两代码，就ok了！
原文出处：http://blog.163.com/lazy_p/blog/static/135107216201025103930374/
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