Java 切换用户后，如何使用JSch库获取SFTP服务器上目录中所有文件的列表？

我编写了一个程序，在切换到特定用户后，使用JSch库读取目录中的所有文件

但问题是程序读取并显示原始用户/目录中的所有文件，而不是

su

用户（

/apps/my app/

）目录中的所有文件

总而言之，该计划做了以下工作：

打开

会话

打开

exec

频道

执行

su

命令并将

cd

放入要列出其文件的目录

打开

sftp

频道

列出当前目录中的文件，该目录应该是我们先前

cd

插入的目录

关闭

sftp

频道

关闭

exec

频道

关闭

会话

SuListFilesMain.java

public class SuListFilesMain {

    static String cmd = "echo " + DecryptionUtil.decrypt(Constants.userPasswd) + " | su jackm -c \"cd /apps/my-app/ ; pwd\"";

    public static void main(String[] args) throws JSchException, SftpException, Exception {
        //open session
        Session session = SessionUtil.openSession();

        //open exec channel, switch to su and execute command cd
        Channel execChannel = ChannelUtil.openChannel(session, cmd);
        //capture cmd output
        InputStream output = execChannel.getInputStream();
        String result = CharStreams.toString(new InputStreamReader(output));
        //CORRECT: PRINTS /APPS/MY-APP (See Output below)
        System.out.println(result); 

        //open sftp channel
        ChannelSftp sftpChannel = ChannelUtil.openSftpChannel(session);
        //ls
        List<String> allFiles = new ArrayList<>();
        Vector<LsEntry> vector = sftpChannel.ls(".");
        for (LsEntry entry : vector) {
            allFiles.add(entry.getFilename());
        }
        //INCORRECT: PRINTS FROM / DIRECTORY INSTEAD OF /APPS/MY-APP (See Output below)
        System.out.println(allFiles); 
        //close sftp channel
        sftpChannel.exit();

        //close exec channel
        ChannelUtil.closeChannel(execChannel);

        //close session
        SessionUtil.closeSession(session);
    }

}

public class SessionUtil {

    private static final Properties envProps = ReadPropertyUtil.readAllProperties("application.properties");

    public static Session openSession() throws JSchException {
        JSch jSch = new JSch();
        String host = envProps.getProperty("host");
        String username = envProps.getProperty("username");
        String pwd = DecryptionUtil.decrypt(envProps.getProperty("pwd.encrypted"));
        Session session = jSch.getSession(username, host, 22);
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);
        session.setPassword(pwd);
        System.out.println("Connecting SSH to " + host + " - Please wait for few seconds... ");
        session.connect();
        System.out.println("Connected!\n");
        return session;
    }

    public static void closeSession(Session session) {
        if (null != session) {
            session.disconnect();
            System.out.println("\nDisconnected channel and session");
        }
    }

}

public class ChannelUtil {

    public static Channel openChannel(Session session, String cmd) throws JSchException {
        Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand(cmd);
        channel.connect();
        return channel;
    }

    public static ChannelSftp openSftpChannel(Session session) throws JSchException {
        Channel channel = session.openChannel("sftp");
        channel.connect();
        ChannelSftp sftpChannel = (ChannelSftp) channel;
        return sftpChannel;
    }

    public static void closeChannel(Channel channel) {
        System.out.println("Closing channel...");
        if (null != channel) {
            channel.setInputStream(null);
            channel.disconnect();
        }
    }

}

ChannelUtil.java

public class SuListFilesMain {

    static String cmd = "echo " + DecryptionUtil.decrypt(Constants.userPasswd) + " | su jackm -c \"cd /apps/my-app/ ; pwd\"";

    public static void main(String[] args) throws JSchException, SftpException, Exception {
        //open session
        Session session = SessionUtil.openSession();

        //open exec channel, switch to su and execute command cd
        Channel execChannel = ChannelUtil.openChannel(session, cmd);
        //capture cmd output
        InputStream output = execChannel.getInputStream();
        String result = CharStreams.toString(new InputStreamReader(output));
        //CORRECT: PRINTS /APPS/MY-APP (See Output below)
        System.out.println(result); 

        //open sftp channel
        ChannelSftp sftpChannel = ChannelUtil.openSftpChannel(session);
        //ls
        List<String> allFiles = new ArrayList<>();
        Vector<LsEntry> vector = sftpChannel.ls(".");
        for (LsEntry entry : vector) {
            allFiles.add(entry.getFilename());
        }
        //INCORRECT: PRINTS FROM / DIRECTORY INSTEAD OF /APPS/MY-APP (See Output below)
        System.out.println(allFiles); 
        //close sftp channel
        sftpChannel.exit();

        //close exec channel
        ChannelUtil.closeChannel(execChannel);

        //close session
        SessionUtil.closeSession(session);
    }

}

public class SessionUtil {

    private static final Properties envProps = ReadPropertyUtil.readAllProperties("application.properties");

    public static Session openSession() throws JSchException {
        JSch jSch = new JSch();
        String host = envProps.getProperty("host");
        String username = envProps.getProperty("username");
        String pwd = DecryptionUtil.decrypt(envProps.getProperty("pwd.encrypted"));
        Session session = jSch.getSession(username, host, 22);
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);
        session.setPassword(pwd);
        System.out.println("Connecting SSH to " + host + " - Please wait for few seconds... ");
        session.connect();
        System.out.println("Connected!\n");
        return session;
    }

    public static void closeSession(Session session) {
        if (null != session) {
            session.disconnect();
            System.out.println("\nDisconnected channel and session");
        }
    }

}

public class ChannelUtil {

    public static Channel openChannel(Session session, String cmd) throws JSchException {
        Channel channel = session.openChannel("exec");
        ((ChannelExec) channel).setCommand(cmd);
        channel.connect();
        return channel;
    }

    public static ChannelSftp openSftpChannel(Session session) throws JSchException {
        Channel channel = session.openChannel("sftp");
        channel.connect();
        ChannelSftp sftpChannel = (ChannelSftp) channel;
        return sftpChannel;
    }

    public static void closeChannel(Channel channel) {
        System.out.println("Closing channel...");
        if (null != channel) {
            channel.setInputStream(null);
            channel.disconnect();
        }
    }

}

输出：

已连接！
/应用程序/我的应用程序
[本地、lib64、、nfs等、引导、srv、主、进程、系统、媒体、lib、bin、运行]
正在关闭频道。。。
断开的通道和会话

SSH通道是完全独立的。在一个通道上执行

su

，对其他通道没有任何影响

您必须在SFTP频道上执行

su

，这是一项相当复杂的任务，部分内容已在我的回答中介绍：

---

SSH通道是完全独立的。在一个通道上执行

su

，对其他通道没有任何影响

您必须在SFTP频道上执行

su

，这是一项相当复杂的任务，部分内容已在我的回答中介绍：