How to read a file from remote system using java?

Question

I have a file copied in one computer and I need to access the file from other computer. I am not sure, which protocol or which technology to use for this? Please provide me

Answer 1

You can read from remote and write to remote using jcifs-1.3.15.jar jar in java but first you need to share location from remote system then it's possible.

try{
            String strLine="";    
            NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication("WORKGROUP", "username", "passwd"); // Authentication info here, domain can be null
    //        try (InputStream is = new SmbFile("smb://DESKTOP-0xxxx/usr/local/cache/abc.txt", auth).getInputStream()) {
            try (InputStream is = new SmbFile("smb://xx.xx.xx.xxx/dina_share/abc.txt", auth).getInputStream()) {
                BufferedReader br = new BufferedReader(new InputStreamReader(is));
            while ((strLine = br.readLine()) != null) {
                System.out.println(strLine);
            }
            } catch (IOException e) {
                e.printStackTrace();
            }
            String smbURL="smb://xx.xx.xx.xxx/dina_share/abcOther.txt";
            SmbFileOutputStream fos = new SmbFileOutputStream(new SmbFile(smbURL,auth));
            byte bytes[]="Wellcome to you".getBytes();
            fos.write(bytes);
        }catch(Exception e){
            e.printStackTrace();
        }

Answer 2

Share the directory and access the file thruogh java code try this one:

File f = new File("//10.22.33.122/images")

File[] files = f.listFiles(new FilenameFilter() {
    public boolean accept(File dir, String name) {
        // Specify the extentions of files to be included.
        return name.endsWith(".bmp") || name.endsWith(".gif");
    }
});

// get names of the files
String[] fileNamesArray = null; 
for (int indx = 0; indx < files.length(); indx++) {
    fileNamesArray[indx] = files[indx].getName();
}

return fileNamesArray; 

Answer 3

if the remote computer is in the same network and on a shared folder to the computer where your java code is running then try this piece of code for accessing it

File file = new File("\\\\Comp-1\\FileIO\\Stop.txt");

here Comp-1 is the DNS name of the machine containing the file in the network!!!

Answer 4

HTTP is an option. However, if these are Windows machines on the same LAN, it would be easier to expose the directory on the remote machine via a file share and access the file through a regular file path. Similarly, if these are Unix-like machines, you could use regular file paths if you're using NFS. FTP's yet another option.

Answer 5

Map your IP to network drive and try let us say the drive letter is X,

then code changes to File f = new File("x:\\home\\renjith\\picture.jpg");

Infact your file is already loaded in object f , try priting the value of the path f.getAbsolutePath() to console and see.. Actual error is with ImageIO

Answer 6

You might try:

URL url = new URL("file://192.168.1.157/home/renjith/picture.jpg");
Image image = ImageIO.read(url);