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<%
  java.io.BufferedInputStream bis=null;
  java.io.BufferedOutputStream  bos=null;
try{
 String filename=request.getParameter("filename");
             filename=new String(filename.getBytes("iso8859-1"),"gb2312");
 response.setContentType("application/x-msdownload");
 response.setHeader("Content-disposition","attachment; filename="+new String(filename.getBytes("gb2312"),"iso8859-1"));
 bis =new java.io.BufferedInputStream(new java.io.FileInputStream(config.getServletContext().getRealPath("files/" + filename)));
 bos=new java.io.BufferedOutputStream(response.getOutputStream()); 
 byte[] buff = new byte[2048];
 int bytesRead;
 while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
  bos.write(buff,0,bytesRead);
 }
}
catch(Exception e){
 e.printStackTrace();
}
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 if (bis != null)bis.close();
 if (bos != null)bos.close();
}
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