Hi,
Oreilly has a way to rename files automatically so that if a file
exists, a new file with a ".1", ".2" etc, is created (or something
similar).
If that doesn't work for you, you don't really need two passes,
Just keep a vector of java.io.File and use them later when you figured
out what you want to do.
Enumeration files = multi.getFileNames();
while (files.hasMoreElements()) {
String name = (String)files.nextElement();
String filename = multi.getFilesystemName(name);
String type = multi.getContentType(name);
File f = multi.getFile(name);
/*
*In here preserve the fields in a hash
* something like hashFile.put(filename, f)
*/
out.println("<p>name: " + name);
out.println("filename: " + filename);
out.println("type: " + type);
if (f != null) {
out.println("f.toString(): " + f.toString());
out.println("f.getName(): " + f.getName());
out.println("f.exists(): " + f.exists());
out.println("f.length(): " + f.length());
out.println();
}
}
Haven't really tried this, but it should work.
Dror
On Tue, Oct 15, 2002 at 02:08:24PM +0800, hugo wrote:
> Hi
>
> I am trying to do something in a jsp file with the oreilly
> MultipartParser functions and I am getting immensely frustrated as it
> does not work. What I would like to do is:
>
> 1. Get information from a set of form fields with the MultipartParser,
> including upload fields.
>
> 2. Load the filenames from the upload fields into a Vector and compare
> the filenames from that Vector to filenames already in the directory
> where the files will be downloaded. This is in order to avoid files with
> the same filenames overriding existing files.
>
> 3. If the filenames do not exist in the directory, download the files
> into the directory.
>
> What I am getting stuck on is the fact that I have to use
> MultipartParser to read the files from the form and store the filenames
> in a Vector. I then compare with existing filenames, then would like to
> use MultipartParser AGAIN to write the filenames to the specified
> directory. But the second time around, the MultipartParser does not want
> to write anything to the directory as the method readNextPart()
> apparently only works once.
>
> Here is the code:
>
> 1. Get information from form fields and write filenames into a Vector:
> (Vector is defined and initialised earlier on).
>
> MultipartParser parser = new MultipartParser(request, 10*1024*1024);
>
> Part part = null;
>
> while ((part = parser.readNextPart()) != null) {
> if (part.isFile()) {
> // It's a file part
> FilePart filePart = (FilePart) part;
> String fileName = filePart.getFileName();
> if (fileName != null) {
> existingfiles.add(fileName);
> out.println("filename: " + fileName);
> }
> }
> }
>
> 2. Compare filenames in Vector with files already in the directory. Note
> that the String "proj_id" is a string which I obtain from a database - I
> didn't put that code in here.
>
> try {
>
> Process p = Runtime.getRuntime().exec("ls
> /var/www/projects_data/"+proj_id);
>
> BufferedReader stdInput = new BufferedReader(new
> InputStreamReader(p.getInputStream()));
> String s = "";
> BufferedReader stdError = new BufferedReader(new
> InputStreamReader(p.getErrorStream()));
> if ((s = stdInput.readLine())== null) {
> samefile = "no";
> }
> while ((s = stdInput.readLine())!= null) {
> StringTokenizer tr = new StringTokenizer(s," ", true );
> String t = tr.nextToken();
> for (int i = 0; i < existingfiles.size(); i++) {
> out.println ("<br>Vector value is: " +
> existingfiles.get(i).toString());
> if (t.equals(existingfiles.get(i).toString())) {
> samefile = "yes";
> samefilenames.add(existingfiles.get(i).toString());
> } else {
> samefile = "no";
> }
> }
> }
> } catch (IOException e) {
> out.println("exception: ");
> e.printStackTrace();
> System.exit(-1);
> }
>
> 3. Use the parser again, this time to write the files to the directory
> with the line
>
> long size = fileP.writeTo(dir);
>
> (Note that file "dir" has been set tot the directory earlier)
>
> This happens only if the string samefile equals "no" of course. If
> samefile equals "yes" a message is displayed on the screen telling the
> user that the file already exists.
>
> Note that I am even initialising a new FileParser called fileP - I
> thought this may help. But whatever I try, after the line:
>
> while ((part = parser.readNextPart()) != null) {
>
> nothing happens.
>
> It seems to me that the parser cannot be used twice. Help!!
>
> if (samefile.equals("yes")) {
> out.println ("<br><br><br><br><p><center><font size=+1
> color=#9966CC><b>You have uploaded the following file(s) with the same
> name(s) as existing file(s):");
> out.println ("<p></p>");
> for (int j = 0; j < existingfiles.size(); j++) {
> out.println ("<p>" + existingfiles.get(j).toString());
> }
> } else if (samefile.equals("no")) {
> while ((part = parser.readNextPart()) != null) {
> String name = part.getName();
> out.println("name: " + name);
> if (part.isFile()) {
> FilePart fileP = (FilePart) part;
> String fileN = fileP.getFileName();
> out.println("filename: " + fileN);
> if (fileN != null) {
> long size = fileP.writeTo(dir);
> }
> }
> }
> }
>
>
> Any help, particularly a code example on how to use MultipartParser
> twice to upload and save files, or even on how to do all of this
> differently will be greatly appreciated.
>
> Thanks
>
> Hugo
> --
> Dr Hugo Bouckaert
> Systems and Programming Engineer
>
> GeoInformatics Exploration Australia P/L
> 57 Havelock St
> West Perth, WA 6005
> PO Box 1675, West Perth 6872
>
> Ph: 61 08 9420 7400
> Fax: 61 08 9226 1299
>
> www.geoinformex.com
>
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--
Dror Matalon
Zapatec Inc
1700 MLK Way
Berkeley, CA 94709
http://www.zapatec.com
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