JSchChannel.getExitStatus不回傳在“shell”通道中執行的命令的狀態

我正在嘗試通過 JSch –diff命令比較檔案。我想通過 Java 代碼獲取狀態以了解檔案是否等于 ie echo $status。我怎么能在java中做到這一點？

這是我運行 SSH 命令的課程

public class SSH {

    static Logger logger = LogManager.getLogger("sshLogger");
    static Process p;
    static String s;
    int exitStatus = -1;
    String user;
    String pass;
    String server;
    String command;
    public Channel channel;
    public Session session;
    public InputStream in;

    public SSH(String user, String pass, String server) {
        this.user = user;
        this.pass = pass;
        this.server = server;
        logger.debug("instance: "   user   "@"   server);
    }

    private Session getConnectedSession(String user, String pass, String server) throws JSchException {

        session = new JSch().getSession(user, server, 22);
        java.util.Properties config = new java.util.Properties();
        session.setPassword(pass);
        config.put("StrictHostKeyChecking", "no");
        config.put("PreferredAuthentications","publickey,keyboard-interactive,password");
        session.setConfig(config);

        logger.debug("get connected session at: "   server);
        session.connect();
        logger.debug("connected to session");

        return session;

    }

    public Channel getChannel() {

        // ByteArrayOutputStream byteArrOutSt = new ByteArrayOutputStream();

        try {
            session = getConnectedSession(user, pass, server);
            logger.debug("opening channel at: "   server);
            channel = session.openChannel("shell");
        } catch (JSchException e) {
            logger.error("failed to connect to: "  user   "@"  server);
            e.printStackTrace();
        }
        // channel.setOutputStream(baos);
        channel.setOutputStream(System.out);
        channel.setExtOutputStream(System.out, true);
        // channel.setPty(Boolean.FALSE);

        return channel;

    }

    public String commandBuilder(String... commands)  {

        StringBuilder commandString = new StringBuilder();
        for (String command : commands) {
            logger.debug("adding command: "   command);
            commandString.append(command   "\\n");
        }
        logger.debug("adding command: exit");
        commandString.append("exit\\n");
        String myCommand = commandString.toString().replace("\\n", "\n");
        return myCommand;
    }
    
    
    public String executeCommand(String myCommand) {
        channel = getChannel();
        //String finishedCommand = commandBuilder(myCommand);
        logger.debug(myCommand);
    
        StringBuilder outBuff = new StringBuilder();
        String outComm = null;
        channel.setInputStream(new ByteArrayInputStream(myCommand.getBytes(StandardCharsets.UTF_8)));
        try {
            in = channel.getInputStream();
            channel.connect();
            // read from the output
            System.out.println("printing");
            while (true) {
                for (int c; ((c = in.read()) >= 0);) {
                    outBuff.append((char) c);
                }

                if (channel.isClosed()) {
                    if (in.available() > 0)
                        continue;
                    exitStatus = channel.getExitStatus();
                    break;
                }
            }
        } catch (IOException e) {
            logger.error("failed while running or reading output of command: "   myCommand);
        } catch (JSchException e) {
            
            logger.error("failed to connect to server while running command: "   myCommand);
        }
        

        logger.info(outBuff.toString());
        return outBuff.toString();
    }

    
    public void endSession() {

        logger.debug("ending session");
        channel.disconnect();
        session.disconnect();
        logger.debug("disconnected channel and session");

        // print exit status
        logger.debug("Exit status of the execution: "   exitStatus);
        if (exitStatus == 0) {
            logger.debug(" (OK)\n");
        } else {
            logger.debug(" (NOK)\n");
        }
    }
    
    public String runCommand(String... commands) {
        
        // many commands as you want
        
        
        String output = null;
        String myCommands;
        myCommands = commandBuilder(commands);
        try {
            output = executeCommand(myCommands);
            endSession();
        } catch (Exception e) {
            logger.error("failed to run ssh comands: "  commands);
            e.printStackTrace();
        } 
        return output;
        
    }
    
}

以 SSHdiff為例：

SSH session = new SSH(user, pass, server);
session.runCommand("diff file1.xml file2.xml");

uj5u.com熱心網友回復：

首先不要在“shell”通道中執行命令。“shell”是一個只有輸入和輸出的黑盒子。查看JSch 中的“shell”通道和“exec”通道有什么區別

使用“執行”頻道。在“exec”頻道中，Channel.getExitStatus作品。

有關代碼示例，請參閱： 如何讀取 JSch 命令輸出？

強制警告：不要StrictHostKeyChecking=no用于盲目接受所有主機密鑰。那是一個安全漏洞。您失去了對MITM 攻擊的保護。有關正確（且安全）的方法，請參閱：How to resolve Java UnknownHostKey, while using JSch SFTP library？

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