java 通過ssh操作linux

項目中有這樣一個需求。web程序 調用腳本 來運行服務器上的程序 。執行任務。
想到了ssh 操作 程序的啓動腳本，同時傳遞參數。
一位大佬的 工具類 不廢話 直接分享

package util.ssh;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.SCPClient;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;

import java.io.*;

/**
 * ssh操作類
 * 
 */
public class RemoteExecuteCommand {

    /**
     * 字符編碼默認是utf-8
     */
    private static final String DEFAULT_CHART = "UTF-8";
    /**
     * 遠程 IP
     */
    private String ip;
    /**
     * 用戶名
     */
    private String userName;
    /**
     * 密碼
     */
    private String password;

    public RemoteExecuteCommand(String ip, String userName, String password) {
        this.ip = ip;
        this.userName = userName;
        this.password = password;
    }

    /**
     * 獲取 SSH 遠程連接
     *
     * @return 遠程連接
     */
    public Connection getConnection() throws IOException {
        Connection conn = new Connection(ip);
        // 連接
        conn.connect();
        // 認證
        boolean flag = conn.authenticateWithPassword(userName, password);
        if(!flag) {
            throw new IOException("ssh遠程連接認證失敗！");
        }
        return conn;
    }

    /**
     * 執行指定的命令
     *
     * @param conn 遠程連接
     * @param cmd 指定的命令信息
     * @return 執行的結果
     */
    public String execute(Connection conn, String cmd) throws IOException {
        String result;
        Session session = null;
        try {
            // 打開一個會話
            session = conn.openSession();
            // 執行命令
            session.execCommand(cmd);
            result = processStdout(session.getStdout(), DEFAULT_CHART);
            // 如果爲得到標準輸出爲空，說明腳本執行出錯了
            if ("".equals(result)) {
                result = processStdout(session.getStderr(), DEFAULT_CHART);
            }
        } finally {
            if(session != null) {
                session.close();
            }
        }
        return result;
    }

    /**
     * 將本地文件目錄下所有的文件存儲到遠程機器指定的目錄上
     *
     * @param conn 遠程連接
     * @param localPath 本地文件目錄
     * @param remotePath 遠程文件目錄
     */
    public void scpFileDir(Connection conn, String localPath, String remotePath) throws IOException {
        SCPClient client = new SCPClient(conn);
        File file = new File(localPath);
        File[] files = file.listFiles();
        if(files == null) {
            throw new IOException("the path no file!");
        }
        String[] localFiles = new String[files.length];
        for (int i = 0, length = files.length; i < length; i++) {
            localFiles[i] = files[i].getAbsolutePath();
        }
        client.put(localFiles, remotePath);
    }

    /**
     * 將本地文件存儲到遠程機器指定的目錄上
     *
     * @param conn 遠程連接
     * @param filePath 本地文件
     * @param remotePath 遠程文件目錄
     */
    public void scpFile(Connection conn, String filePath, String remotePath) throws IOException {
        SCPClient client = new SCPClient(conn);
        File file = new File(filePath);
        if(file.isFile()) {
            client.put(filePath, remotePath);
        } else {
            throw new IOException("the file not find!");
        }
    }

    /**
     * 解析腳本執行返回的結果集
     * @param in 輸入流對象
     * @param charset 編碼
     * @return 流獲取結果
     */
    private String processStdout(InputStream in, String charset) throws IOException {
        InputStream stdout = new StreamGobbler(in);
        StringBuilder builder = new StringBuilder();
        BufferedReader br = new BufferedReader(new InputStreamReader(stdout, charset));
        String line;
        while ((line = br.readLine()) != null) {
            builder.append(line).append("\n");
        }
        return builder.toString();
    }

    public void close(Connection connection) {
        if(connection != null) {
            connection.close();
        }
    }

}

測試類

 public static void main(String[] args) {
        RemoteExecuteCommand command = new RemoteExecuteCommand("xxx", "xxx", "xxx");
        Connection connection = null;
        try {
            //linux 本地機器
            connection = command.getConnection();
            String linux= command.execute(connection, "sh /home//mytest/test.sh a b");
            System.out.println(linux);
             //hadoop 集羣
            String hadoop = command.execute(connection, "hadoop fs -ls impala");
            System.out.println(hadoop);

        }catch (Exception e){
        e.printStackTrace();
        }
    }