how to use a supplied username and password to read a file in Java

Question

I need to read a bunch of binary files from a Java script running on Windows.

However, the folder that the files are in has limited permissions. I (i.e. my Windows username) have permissions to read them, but the user that Java runs as (this is part of a web application) does not. If I pass my own username and Windows network password into Java at runtime, is there a way I can read those files using my own permissions rather than the web user's?

(Note that this is NOT happening over the web; this is a one-time import script running in the context of a web application.)

Answer 1

If the files are on a network-share you could use the net tool. With

runtime.exec("net use ...")

to open and close the share. I guess that should work

Answer 2

You could create a network share and then connect via jCIFS

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.UnknownHostException;

import jcifs.smb.SmbException;
import jcifs.smb.SmbFileInputStream;

public class Example
{
    public static void main(String[] args)
    {
     SmbFileInputStream fis = null;
     try
     {
      fis = new SmbFileInputStream("smb://DOMAIN;USERNAME:PASSWORD@SERVER/SHARE/filename.txt");
      // handle as you would a normal input stream... this example prints the contents of the file
      int length;
      byte[] buffer = new byte[1024];
      while ((length = fis.read(buffer)) != -1)
      {
       for (int x = 0; x < length; x++)
       {
        System.out.print((char) buffer[x]);
       }
      }
     }
     catch (MalformedURLException e)
     {
      e.printStackTrace();
     }
     catch (UnknownHostException e)
     {
      e.printStackTrace();
     }
     catch (SmbException e)
     {
      e.printStackTrace();
     }
     catch (IOException e)
     {
      e.printStackTrace();
     }
     finally
     {
      if (fis != null)
      {
       try
       {
        fis.close();
       }
       catch (Exception ignore)
       {
       }
      }
     }
    }
}