本文介绍了解决在使用普元平台进行文件下载操作时遇到的Servlet异常问题，具体异常为在下载完成后，后台抛出getOutputStream() has already been called for this response错误。通过调用out.clear()和设置pageContext.pushBody()的方法来规避这一问题。
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：
[eos-default][2011-03-18 16:00:58,546][ERROR][com.eos.access.http.InterceptorFilter:182]
java.lang.IllegalStateException: getOutputStream() has already been called for this response
[eos-default][2011-03-18 16:00:58,546][ERROR][com.primeton.ext.engine.core.processor.AbstractPageFlowProcessor:649] error [com.hymake.projInfo.ProjFilling.flow?_flowKey=0565fa0d-699d-4dd7-8646-e98c0523ccb9.end2]
javax.servlet.ServletException: getOutputStream() has already been called for this response
[eos-default][2011-03-18 16:00:58,546][ERROR][com.eos.access.http.InterceptorFilter:182]
java.lang.IllegalStateException: Cannot forward after response has been committed
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