java.lang.IllegalStateException: getOutputStream() has already been called for this response
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java.lang.IllegalStateException: getOutputStream() has already been called for this response
原因:
因为页面出现了多个输出流所至,在多个<%//使用了outputStream %>语句之间不能有空格及多余的字符。也就是页面中<%//使用了outputStream %>之外不能有空格或其它任何字符。在之内的语句可以有空格及回车。也就是说如果你的JSP页面本来就有了一个输出流,但是由于你在其中又重新定义了一个输出流,服务器就会报错!
解决方法:
os.flush();
参见servlet API中的getOutputStream()方法的使用说明。
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