try {<br />SmartUpload su = new SmartUpload();<br />su.initialize(pageContext.getServletConfig(),request,response);<br />su.setContentDisposition(null);<br />su.downloadFile("a.txt");<br />} catch (Exception e) {<br />e.printStackTrace();<br />}<br />这个是我写得下载文件的代码,但是老是报:getOutputStream() has already been called for this response<br />的错误呀,谁可以帮我解决吗??????? <br />