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 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)));
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 int bytesRead;
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}
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