未執行使用 ChannelExec 的命令 - Jsch

Question

我正在使用 Jsch 在服務器中創建一個文件並執行一些命令。 對於文件創建，它工作正常，但是，對於命令執行，則不然。 它保持狀態 -1（仍在處理它）並永遠保持在那里。 這發生在 shell 執行或當我嘗試成為 root 時。 按照下面使用的方法：

public void upload(String localPath) throws IOException {
    Session session = connectToServer();
    System.out.println("In upload");
    ChannelSftp channelSftp = getChannelToSftpServer(session);

    //Creating file in temporary location
    File f = new File(localPath);
    FileInputStream fi = new FileInputStream(f);

    // Creating file on server and setting the permissions to the user (chmod 777)

    if (channelSftp != null) {
        try {
            System.out.println("Change working in temp directory");
            changeWorkingDirectory(channelSftp, TEMP_PATH);
            
            ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
            //THE PROBLEM ALSO HAPPENS WHEN EXECUTING A SHELL WITH THIS COMMAND INSIDE
            channelExec.setCommand(
                "root command (using pbrun) <command is here, confidential> "); 
            InputStream commandOutput = channelExec.getInputStream();
            channelExec.connect();

            StringBuilder outputBuffer = new StringBuilder();
            int readByte = commandOutput.read();

            while(readByte != 0xffffffff)
            {
               outputBuffer.append((char)readByte);
               readByte = commandOutput.read();
               System.out.println(outputBuffer);
            }
            System.out.println("Root connected.");
            channelExec.disconnect();
            
            channelSftp.put(fi, f.getName());
            channelSftp.chmod(0777, localPath);
            channelSftp.chown(123, localPath);
            channelSftp.chgrp(123, localPath);
            
            System.out.println("File configurations changed.");
            
            //Copying to the official path
            channelExec = (ChannelExec) session.openChannel("exec");
            channelExec.setCommand("mv /tmp/"+f.getName()+" "+path);
            channelExec.connect();
            System.out.println("File is completed and ready!");
            
            while (channelExec.getExitStatus() == -1) {
                Thread.sleep(1000);
                
            }
            channelExec.disconnect();

        } catch (SftpException e) {
            e.printStackTrace();
            throw new IOException(e.getStackTrace() + "");
        } catch (JSchException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            disconnectChanneltoSftpServer(channelSftp);
            session.disconnect();
            fi.close();
            // Deletes the local File.
            f.delete();
        }
    }
}

我究竟做錯了什么？ 先感謝您。

Answer 1

您必須在調用connect()之前調用getInputStream() connect() 。

實際上，您最好同時閱讀 stderr 和 stdout 以獲取錯誤信息。
為此，請參閱我對如何讀取 JSch 命令輸出的回答？