EOS has already been called for this response
解决问题可以参考此链接： http://huibin.iteye.com/blog/675707关键代码 ：out.clear(); out = pageContext.pushBody();
使用普元 使用下载时，下载完成后 后台会抛出异常 如：
java.lang.IllegalStateException: getOutputStream() has already been called for this response
error
javax.servlet.ServletException: getOutputStream() has already been called for this response
java.lang.IllegalStateException: Cannot forward after response has been committed
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