文件写出web头部设置
if(rpt!=null){ response.reset(); boolean isDownload = "download".equalsIgnoreCase(request.getParameter("mode")); String mode = isDownload ? "attachment" : "inline"; response.setContentType("APPLICATION/DOWNLOAD"); response.setHeader("Content-Disposition",mode+";filename=" +downloadFileName+"."+getReportExtension(reportFormat)); response.setHeader("Pragma", "public"); response.setDateHeader("Expires", 0); response.setHeader("Cache-Control","must-revalidate,post-check=0,pre-check=0"); try {OutputStream os = null;response.setContentLength(rpt.length);os = response.getOutputStream();os.write(rpt);os.close();response.flushBuffer();return null;} catch (Exception e) {e.printStackTrace();} } rpt为要输出文件的字节数组：byte[] rpt=xxx；说明：
1、response.reset(); 清除buffer
2、response.setHeader("Content-disposition","attachment;filename="+new String(str.getBytes("gb2312"),"iso8859-1")); //客户使用目标另存为对话框保存指定文件
3、response.setHeader("Content_Length",length);设置头文件的长度为指定文件的长度
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