Good evening. I was wondering if someone could help me with a Download Servlet our company uses. I have supplied the code below. It is used to download PowerPoint files.
The problem with it is that the servlet performs very slowly when trying to download a file over our local network. Our network is a 10/100 Mbps LAN, and the maximum file size for a PowerPoint file is 4.6 MB, and it takes about 11 to 12 minutes to download. Does anyone know what could be causing the problem? Let me know. Thanks.
if (dbString == null || dbString.equals("") || unid == null || unid.equals("")) { //ServletOutputStream out = response.getOutputStream(); System.out.println("The full path the file must be specified"); out.println("The full path the file must be specified"); return; } if (null == filename || filename.equals("")) { //use unid as the default filename filename = unid; } if (null == target || target.equals("")) { //attachment filename as used for content-disposition unless a target filename is specified target = filename; } try { NotesThread.sinitThread(); session = Session.newInstance(); //get handle to doc db = session.getDatabase("", dbString); if (db == null || !db.isOpen()) { //ServletOutputStream out = response.getOutputStream(); System.out.println("Unable to open database"); out.println("Unable to open database"); return; } doc = db.getDocumentByUNID(unid); if (doc == null) { //ServletOutputStream out = response.getOutputStream(); System.out.println("Unable to open document"); out.println("Unable to open document"); return; }
//extract file attachment = doc.getAttachment(filename); if (attachment == null) { //ServletOutputStream out = response.getOutputStream(); System.out.println("Unable to open attachment"); out.println("Unable to open attachment"); return; } directory = new File(unid); if (!directory.exists()) { directory.mkdir(); } filePath = directory.getPath() + "/" + filename; attachment.extractFile(filePath); db.recycle(); detachedFile = new File(filePath); //String filename = req.getParameter("db") + ".ppt"; //String filepath = "C:\\tomcat331\\webapps\\examples\\uploadpres\\"; response.setContentType("application/unknown"); response.setHeader( "Content-Disposition", "attachment; filename=\"" + target + "\""); long fileLength = detachedFile.length(); response.setHeader( "Content-Length", new Long(fileLength).toString()); //response.setContentLength( new Long( detachedFile.length() ).intValue() ) ; // print the file InputStream in = null; int bufferSize = 0 ; if ( fileLength > MAXIMUM_BUFFER_SIZE ){ bufferSize = MAXIMUM_BUFFER_SIZE ; } else { bufferSize = (int) fileLength ; } try { in = new BufferedInputStream(new FileInputStream(filePath), bufferSize ); int ch; while ((ch = in.read()) != -1) { out.write(ch); } } finally { if (in != null) in.close(); // very important }
/* java.io.FileInputStream fileInputStream = new java.io.FileInputStrea m(filePath); int i; while ((i = fileInputStream.read()) != -1) { out.write(i); } fileInputStream.close(); out.close();
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