如何使用VLC在SSH服务器上（使用sftp或smth其他）监视文件（正在修改文件）？

由于我所有尝试直接通过带有“ sftp：//”链接的VLC进行流式传输的尝试均告失败，因此我设法编写了一个小型Java程序，该程序可以通过下载文件并始终检查远程文件的大小来实现所需的功能已更改为恢复下载（如果需要）。

这里的关键是那段代码：

    sftpChannel.get(remotePath, outstream, monitor, ChannelSftp.OVERWRITE, 0);
    long localSize;
    Thread.sleep(1000);
    while(sftpChannel.lstat(remotePath).getSize() > (localSize = new File(localPath).length())){
        sftpChannel.get(remotePath, outstream, monitor, ChannelSftp.RESUME, localSize);
        Thread.sleep(timeToWaitBeforeUpdatingFile);

    }
    System.out.println("The download is finished.");

如果有人感兴趣，我还将发布该程序的整个代码：

package streamer;

import java.io.Console;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;
import java.util.Vector;

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;
import com.jcraft.jsch.SftpProgressMonitor;

public class Streamer {
    public static void main(String[] args) throws InterruptedException, IOException {
        JSch jsch = new JSch();

        if(args.length != 7){
            System.out.println("Incorrect parameters:");
            System.out.println("Streamer user host port privateKeyPath remotePath localPath vlcPath");
            System.exit(-1);
        }

        String user = args[0];
        String host = args[1];
        int port = -1;
        try {
            port = Integer.parseInt(args[2]);
        } catch (NumberFormatException e3) {
            System.out.println("Port must be an integer");
            System.exit(-1);
        }
        String privateKeyPath = args[3];

        String remotePath = args[4];
        String localPath = args[5];
        String vlcPath = args[6];

        int timeToWaitBeforeUpdatingFile = 5000;
        String password = "";

        Console console = System.console();
        if (console == null) {
            System.out.println("Couldn't get Console instance");
            //password = "";
            System.exit(-1);
        }else{
            char passwordArray[] = console.readPassword("Enter your password: ");
            password = new String(passwordArray);
            Arrays.fill(passwordArray, ' ');
        }

        try {
            jsch.addIdentity(privateKeyPath, password);
        } catch (JSchException e) {
            System.out.println(e.getMessage());
            System.out.println("Invalid private key file");
            System.exit(-1);
        }

        Session session;
        try {
            session = jsch.getSession(user, host, port);
            java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);

            System.out.println("Establishing connection...");
            session.connect();
            System.out.println("Connection established.");
            System.out.println("Creating SFTP Channel...");
            ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
            sftpChannel.connect();
            System.out.println("SFTP Channel created.");

            try {
                @SuppressWarnings("unchecked")
                Vector<ChannelSftp.LsEntry> recordings = sftpChannel.ls(remotePath + "*.mpeg");
                if(recordings.isEmpty()){
                    System.out.println("There are no recordings to watch.");
                    System.exit(0);
                }
                int choice = 1;
                System.out.println("Chose the recording to watch:");
                for (ChannelSftp.LsEntry e : recordings){
                    System.out.println("[" + choice++ + "] " + e.getFilename());
                }
                Scanner sc = new Scanner(System.in);
                try {
                    String fileName = recordings.get(sc.nextInt() - 1).getFilename();
                    remotePath += fileName;
                    localPath += fileName;
                } catch (InputMismatchException e) {
                    System.out.println("Incorrect choice");
                    System.exit(-1);
                }
                System.out.println("You chose : " + remotePath);
                sc.close();
            } catch (SftpException e2) {
                System.out.println("Error during 'ls': the remote path might be wrong:");
                System.out.println(e2.getMessage());
                System.exit(-1);
            }

            OutputStream outstream = null;
            try {
                outstream = new FileOutputStream(new File(localPath));
            } catch (FileNotFoundException e) {
                System.out.println("The creation of the file" + localPath + " failed. Local path is incorrect or writing permission is denied.");
                System.exit(-1);
            }

            try {
                SftpProgressMonitor monitor = null;
                System.out.println("The download has started.");
                System.out.println("Opening the file in VLC...");
                try {
                    Runtime.getRuntime().exec(vlcPath + " " + localPath);
                } catch (Exception ex) {
                    System.out.println("The file couldn't be opened in VLC");
                    System.out.println("Check your VLC path.");
                    System.out.println(ex);
                }
                sftpChannel.get(remotePath, outstream, monitor, ChannelSftp.OVERWRITE, 0);
                long localSize;
                Thread.sleep(1000);
                while(sftpChannel.lstat(remotePath).getSize() > (localSize = new File(localPath).length())){
                    sftpChannel.get(remotePath, outstream, monitor, ChannelSftp.RESUME, localSize);
                    Thread.sleep(timeToWaitBeforeUpdatingFile);

                }
                System.out.println("The download is finished.");
                outstream.close();
                System.exit(0);
            } catch (SftpException e1) {
                System.out.println("Error during the download:");
                System.out.println(e1.getMessage());
                System.exit(-1);
            }
        } catch (JSchException e) {
            System.out.println("Connection has failed (check the user, host, port...)");
            System.exit(-1);
        }
    }
}