解决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。
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。
解决:
加入两行:
out.clear();
out = pageContext.pushBody();
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