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Java Forum / General / November 2005File util API to move files accross partitions/filesystems
Hi, I'm looking for an open source java file utility/API that has a method to move files accross filesystems. Can anybody suggest one ? BTW, I recently discover a class in Ant API called org.apache.tools.ant.taskdefs.Move, extending Copy class. Is this a good alternative to do the above task ? I'm currently using jsdk 1.4, where the java.io.File.renameTo() method is platform dependent, ie. this method does not work when multiple partitions/filesystem are involved. Thanks a lot !! Dwi You can use the free open-source Apache Jakarta Commons IO library. http://jakarta.apache.org/commons/io/ In it you will find the org.apache.commons.io.FileUtils class that might help you. Regards > I'm looking for an open source java file utility/API that has a >method to >move files accross filesystems. Can anybody suggest one ? The OSes don't let you do that for security reasons. You don't want folk out on the net fiddling with your files as if there were their own. So you need to write a pair of programs that communicate. The server on one gets requests from the other and writes the data it receives. It does some sort of check to make sure the incoming traffic is legit, and only writes files in certain places to make sure malicious people can't trash valuable files. In practice you might consider the following tools for copying files between filesystems http://mindprod.com/jgloss/ftp.html http://mindprod.com/jgloss/rsync.html http://mindprod.com/webstarts/replicator.html http://mindprod.com/products1.html#FILETRANSFER  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > So you need to write a pair of programs that communicate. The server > on one gets requests from the other and writes the data it receives. I beleive you've misunderstood the request: "across filesystems" means across partitions or physical disks within the same system. Renaming isn't sufficient, you need to read from the source file, write to the destination file, and ultimately remove the source file. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >I beleive you've misunderstood the request: "across filesystems" means >across partitions or physical disks within the same system. Renaming >isn't sufficient, you need to read from the source file, write to the >destination file, and ultimately remove the source file. In that case, you can do it with a script copy or with the FileTransfer class. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > In that case, you can do it with a script copy or with the > FileTransfer class. *The* FileTransfer class? AFAIK there is no such class included as part of any Sun JDK. A Google search results in at least a handful of classes with that name. Anyway to the OP: copying a file from one partition to another requires not more than about 10 lines of code (read from an InputStream, write to an OutputStream, repeat until EOF, close both). /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e > Anyway to the OP: copying a file from one partition to another > requires not more than about 10 lines of code (read from an > InputStream, write to an OutputStream, repeat until EOF, close both). Unless you also want to preserve permissions, access times, etc. (Which may not be the case for the OP.) -- chris > Unless you also want to preserve permissions, access times, etc. (Which may > not be the case for the OP.) (hmm, didn't think of that) AFAIK you can't preserve those (or change them after the copy) from within Java. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e >*The* FileTransfer class? the one I mentioned in my previous post http://mindprod.com/products1.html#FILETRANSFER SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Thanks for all the replies so far. I may decide then to write my own instead. I looked at CommonsIO, and I can not find any one. My requirement is actually simpler, ie. within the same server, but with multiple partitions. BTW, Anyone can advise on the performance point of view? I heard that copying file using the usual InputStream read() and write() is not really efficient, especially with large file. Someone suggests using FileChannel class instead. Any suggestion ? Cheers, Dwi > BTW, Anyone can advise on the performance point of view? I heard that > copying file using > the usual InputStream read() and write() is not really efficient, > especially with large file. > Someone suggests using FileChannel class instead. Any suggestion ? yes. use a FileChannel. ;-) (it is much more efficient) SignatureOf making better designs there is no end, and much refactoring wearies the body. >> BTW, Anyone can advise on the performance point of view? I heard that >> copying file using [quoted text clipped - 3 lines] > > yes. use a FileChannel. ;-) (it is much more efficient) Is that true when doing nothing but reading/streaming a file? I will take any performance advanced when getting hashes of files on my drive. -- LTP :) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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