getOutputStream() has already been called for this response
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getOutputStream() has already been called for this response异常出现的原因和解决方法:
jsp中出现此错误一般都是在jsp中使用了输出流(如输出图片验证码,文件下载等),没有妥善处理好的原因。
具体的原因:jsp编译成servlet之后在函数
_jspService(HttpServletRequest request, HttpServletResponse response)
的最后
有一段这样的代码
finally { if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);}
这里是在释放在jsp中使用的对象,会调用response.getWriter(),因为这个方法是和response.getOutputStream()相冲突的!所以会出现以上这个异常。然后当然是要提出解决的办法,其实挺简单的,在使用完输出流以后调用以下两行代码即可:
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