JSch sftp上传/下载进度

Question

我是JSch和java的新手.我设法获得了一些代码并以某种方式理解它,但我坚持一点.以下代码从SSH服务器下载文件,但我需要显示复制文件百分比的进度表.我该怎么做.我将非常感谢你的帮助.

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpProgressMonitor; 
public class SFTPExample {
    public static void main(String args[]) throws Exception {
        String user = "root";
        String password = "password";
        String host = "192.168.0.5";
        int port = 22;
        String knownHostsFilename = "/home/world/.ssh/known_hosts";        
        String sourcePath = "/media/nfs/genotype.txt";
        String destPath = "genotype.txt";        
        JSch jsch = new JSch();
        jsch.setKnownHosts(knownHostsFilename);
        Session session = jsch.getSession(user, host, port);
        session.setPassword(password);
        session.connect(); 
        ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
        sftpChannel.connect();

        System.out.println("Downloading test file");
        sftpChannel.get(sourcePath, destPath);            

        sftpChannel.exit();
        session.disconnect();
    }
}

Answer 1

有一个在方法com.jcraft.jsch.ChannelSftp您使用在回调中传递.看着那(这

void get(java.lang.String src, java.lang.String dst, SftpProgressMonitor monitor) 

方法和com.jcraft.jsch.SftpProgressMonitor接口.在这个示例代码的底部(它有点乱),你会发现SftpProgressMonitor的一个实现,它使用它的回调方法count(long)并end()操纵一个javax.swing.ProgressMonitor.

count(long)当有一些字节已被传输时会定期调用,并end()在传输结束时被调用.所以SftpProgressMonitor的一个非常简单的imeplementation可能是:

public class SystemOutProgressMonitor implements SftpProgressMonitor
{
    public SystemOutProgressMonitor() {;}

    public void init(int op, java.lang.String src, java.lang.String dest, long max) 
    {
        System.out.println("STARTING: " + op + " " + src + " -> " + dest + " total: " + max);
    }

    public boolean count(long bytes)
    {
        for(int x=0; x < bytes; x++) {
            System.out.print("#");
        }
        return(true);
    }

    public void end()
    {
        System.out.println("\nFINISHED!");
    }
}

然后我创建一个实例并将其传递给 get()

sftpChannel.get(sourcePath, destPath, new SystemOutProgressMonitor());