Copying files from a shared folder to a local folder in javaservlet

问题

Im developing a servlet, and I have to copy a file (*.doc) from a shared folder in other computer to my servlet webapp space, but I can't. The trouble is not writing on my Apache Server, instead of, Im expecting troubles copying the file from the remote folder (shared folder in a LAN). Any suggest or idea?

File inFile = new File( "\\\\192.168.2.103\\CompartidaMatias\\tablaEstudios.txt");
        out.println("<p> AbsolutePath --> " + inFile.getAbsolutePath() + "</p>");
        out.println("<p> Path --> " + inFile.getPath() + "</p>");
        out.println("<p> Nombre --> " + inFile.getName() + "</p>");
        out.println("<p> WEBAPP_ROOT --> " + WEBAPP_ROOT + "</p>");



        File outFile = new File(WEBAPP_ROOT + "mydoc3a.txt");

        if (inFile.exists())
            out.println("<p>FILE FOUND</p>");
        else
            out.println("<p>FILE NOT FOUND</p>");

I get always FILE NOT FOUND :( Thanks for your time buddies!! I hope it could be solved, but I have spent all my ideas. Thanks again!!

回答1:

This is not how java.io.File works. It works on the local disk file system only, not on network resources.

Your best bet is to let your operating system platform create a local mapping (kind of a virtual disk) pointing to the network resource and, given you're on Windows, assign it a disk letter as well. Here's a Microsoft Windows 7 guide on the subject:

You just have to map \\192.168.2.103 to e.g. Z:\. Once done that, you should be able to locate the file as follows:

new File("Z:/CompartidaMatias/tablaEstudios.txt");

(note that / works as good as \\ and saves you from effort of escaping them)

Note that this problem has completely nothing to do with servlets. It's just a basic Java problem. You'd have exactly the same problem when executing this in a plain Java application with a main() method (which by the way allows for so much faster and easier testing than a servlet). Keep this in mind for your future questions.

回答2:

try:

URL url = new URL( "file:///192.168.2.103//CompartidaMatias//tablaEstudios.txt" );
File inFile = new File( url.getFile() );

来源：https://stackoverflow.com/questions/13884381/copying-files-from-a-shared-folder-to-a-local-folder-in-javaservlet

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java

servlets

copying

shared-directory