How to move file from directory A to directory B in remote server?

问题

I am using JSch to connect to SFTP in a website which is made from GWT. I had read a little example of sftpChannel.get(), sftpChannel.rename(), sftpChannel.rm()

But I didn't find a solution that copy a file from remote server a directory to remote server b directory.

For example, I want to copy file from /appl/user/home/test/temp to /appl/user/home/test/. Filename = abc.jpg.

I stunned here for few hours since most of the solution from network is getting file from remote server to local, or uploading file from local to remote server.

String existingfile = "abc.jpg";
String newfile = "123.jpg";
FileDirectory = "/appl/user/home/test/";
sftp.cd(FileDirectory+"temp/");
sftp.rename(newfile, FileDirectory+newfile);

Let's say, abc.jpg is existing in /appl/user/home/test/

And I upload a 123.jpg in /appl/user/home/test/temp/.

Now, I want to move 123.jpg to /appl/user/home/test/ and remove abc.jpg in /appl/user/home/test/.

What should I do?

回答1:

It seems like SftpChannel.rename(); need to use full path of file instead of cd to the directory that the file I am going to move.

String existingfile = "abc.jpg";
String newfile = "123.jpg";
FileDirectory = "/appl/user/home/test/";
sftp.cd(FileDirectory+"temp/");
if (sftp.get( newfile ) != null){
    sftp.rename(FileDirectory + "temp/" + newfile , 
        FileDirectory + newfile );
    sftp.cd(FileDirectory);
    sftp.rm(existingfile );
}

回答2:

A core SFTP protocol does not support duplicating a remote file.

There's draft of copy-file extension to the protocol, but that's supported by only few SFTP servers (ProFTPD/mod_sftp and Bitvise SFTP server for example).

The JSch library does not support the copy-file extension either.

Alternatives:

If you have a shell access, open an "exec" channel, and use shell cp command (or equivalent command for your server's OS).
See Exec.java example.
Otherwise, your only option is to download the file to a local temporary location and upload its copy back to a different/target remote directory. Or use the streams, to avoid a temporary file.

See also How can I copy/duplicate a file to another directory using SFTP?

回答3:

You can write a normal Java FileInputStreamand FileOutputStreamcode and instead of using paths like these /appl/user/home/test/temp use full path with its IpAddress or remote server name + your path eg myremoteserver/appl/user/home/test/temp

来源：https://stackoverflow.com/questions/30050045/how-to-move-file-from-directory-a-to-directory-b-in-remote-server

标签

java

sftp

jsch