Simplest way to read a file using jcifs

Question

I am trying to read a file from a network share using the external jcifs library. Most sample codes I can find for reading files are quite complex, potentially unnecessarily so. I have found a simple way to write to a file as seen below. Is there a way to read a file using similar syntax?

SmbFile file= null;
try {
    String url = "smb://"+serverAddress+"/"+sharename+"/TEST.txt";
    NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(null, username, password);
    file = new SmbFile(url, auth);
    SmbFileOutputStream out= new SmbFileOutputStream(file);
    out.write("test string".getBytes());
    out.flush();
    out.close();
} catch(Exception e) {
    JOptionPane.showMessageDialog(null, "ERROR: "+e);
}

Couldn't you just use SmbFileInputStream in a simillar fashion? — Marcin Pietraszek, Apr 19 '17 at 06:10

Marcin Pietraszek · Accepted Answer · 2017-04-19T06:20:18.883

SmbFile file = null;
byte[] buffer = new byte[1024];
try {
    String url = "smb://"+serverAddress+"/"+sharename+"/TEST.txt";
    NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(null, username, password);
    file = new SmbFile(url, auth);
    try (SmbFileInputStream in = new SmbFileInputStream(file)) {
        int bytesRead = 0;
        do {
            bytesRead = in.read(buffer)
            // here you have "bytesRead" in buffer array
        } 
        while (bytesRead > 0);
    }
} catch(Exception e) {
    JOptionPane.showMessageDialog(null, "ERROR: "+e);
}

or even better, assuming that you're working with text files - using BufferedReader from Java SDK:

try (BufferedReader reader = new BufferedReader(new InputStreamReader(new SmbFileInputStream(file)))) {
    String line = reader.readLine();
    while (line != null) {
        line = reader.readLine();
    }
}

And write with:

try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new SmbFileOutputStream(file)))) {
    String toWrite = "xxxxx";
    writer.write(toWrite, 0, toWrite.length());
}

oooh, +1 for the bufferedreader implementation. Was unaware you could do that — Blaine, Apr 19 '17 at 06:24
How do I write a new line using the bufferedwriter solution? Currently If I loop the method the output to file is onetwothreefour. I would like each element on a seperate line. — Blaine, Apr 23 '17 at 12:35

score 8 · Answer 2 · answered Apr 30 '17 at 19:34

    try {
        String url = "smb://" + serverAddress + "/" + sharename + "/test.txt";
        NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(DOMAIN, USER_NAME, PASSWORD);
        String fileContent = IOUtils.toString(new SmbFileInputStream(new SmbFile(url, auth)), StandardCharsets.UTF_8.name());
        System.out.println(fileContent);
    } catch (Exception e) {
        System.err.println("ERROR: " + e.getMessage());
    }

score 2 · Answer 3 · answered Sep 02 '20 at 18:52

I could read some pdf files using this:

    private final Singleton<CIFSContext> contextoDdetran = new Singleton<>() {
        @Override
        public CIFSContext inicializar() {
            NtlmPasswordAuthenticator autenticador = new NtlmPasswordAuthenticator(smbDomain, smbUser, smbPassword);
            return SingletonContext.getInstance().withCredentials(autenticador);
        }
    };

    public byte[] readSmbFile(String fileName) {
        try {
            SmbFile file = new SmbFile(fileName, this.contextoDdetran.get());
            return file.getInputStream().readAllBytes();
        } catch(Exception e) {
            final String msgErro = String.format("Error reading file '%s': %s", fileName, e.getMessage());
            logger.error(msgErro, e);
            throw new IllegalStateException(msgErro);
        }
    }

Simplest way to read a file using jcifs

3 Answers3

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