14

We are working with some legacy code that accesses a shared drive by the letter (f:\ for example). Using the UNC notation is not an option. Our Java wrapper app will run as a service, and as the first step, I would like to map the drive explicitly in the code. Has anyone done this?

GEOCHET
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Brett McCann
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  • If this is for 'users', consider picking a letter towards the end of the alphabet that won't get made unavailable by having one or two usb devices plugged in. – Cheekysoft Oct 16 '08 at 15:49
  • Thats good advice. USB devices take the first available. In our case, the letter of choice is out of our control. We just need to get it mapped. – Brett McCann Oct 16 '08 at 19:37

3 Answers3

16

Consider executing the DOS command that maps a network drive as in the following code:

String command = "c:\\windows\\system32\\net.exe use f: \\\\machine\\share /user:user password";
Process p = Runtime.getRuntime().exec(command);
...

See details on net use command:

The syntax of this command is:


NET USE
[devicename | *] [\\computername\sharename[\volume] [password | *]]
        [/USER:[domainname\]username]
        [/USER:[dotted domain name\]username]
        [/USER:[username@dotted domain name]
        [/SMARTCARD]
        [/SAVECRED]
        [[/DELETE] | [/PERSISTENT:{YES | NO}]]

NET USE {devicename | *} [password | *] /HOME

NET USE [/PERSISTENT:{YES | NO}]
Jorge Ferreira
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  • What happens if the user has already mapped f:? What happens if we run the same program a couple of times and kill it in the middle (e.g. during debugging session)? – ddimitrov Oct 16 '08 at 14:57
  • If the user has already mapped drive f: you would get the "System error 85 has occurred." in the process output. You can just scan for it. – Jorge Ferreira Oct 16 '08 at 15:02
  • After the mounting, we can perform operations on the directory using normal FS commands right? Can you add an example to read a file? When I do `Path share = Paths.get(new URI("f:\"));` i get an error Provider "f" not installed. – Shubham Jan 11 '21 at 14:41
11

You can use JCIFS

http://jcifs.samba.org/src/docs/api/jcifs/smb/SmbFile.html

or if you want higher level API and support for other protocols like FTP, Zip and others:

http://commons.apache.org/vfs/filesystems.html

Both options are pure Java and cross platform.

ddimitrov
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5

I think the easiest way is to use the Runtime.getRuntime().exec() method and call the "net use" command.

For example:

    try {
        // Execute a command without arguments
        String command = "C:\\Windows\\system32\\net.exe use F: \\\\server\\share /user:user password";
        Process child = Runtime.getRuntime().exec(command);
    } catch (IOException e) {
    }
Jonas K
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