Java通过SSH登陆Linux服务器并执行命令(工具类)

package cn.ghostcloud.clusterservice.utils;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Calendar;


@Slf4j
public class SshUtil {

    private static String splitStr = "=====================";

    
    public static Connection SshLogin(String ip, String userName, String password){
        boolean isAuthenticated = false;
        Connection conn = null;
        long startTime = Calendar.getInstance().getTimeInMillis();
        String tipStr = "===========%s=========";
        try {
            conn = new Connection(ip);
            conn.connect(); // 连接主机
            // 认证
            isAuthenticated = conn.authenticateWithPassword(userName, password);
            if(isAuthenticated){
                log.info(String.format(tipStr, "认证成功"));
            } else {
                log.info(String.format(tipStr, "认证失败"));
            }
        } catch (IOException e) {
            log.error(String.format(tipStr, "登录失败"));
            e.printStackTrace();
        }
        long endTime = Calendar.getInstance().getTimeInMillis();
        log.info("登录用时: " + (endTime - startTime)/1000.0 + "sn" + splitStr);
        return conn;
    }

    
    public static String execute(Connection conn, String cmd){
        String result = "";
        Session session = null;
        try {
            if(conn != null){
                // 打开一个会话
                session = conn.openSession();
                // 执行命令
                session.execCommand(cmd);
                String DEFAULT_CHAR_SET = "UTF-8";
                result = processStdout(session.getStdout(), DEFAULT_CHAR_SET);

                //如果标准输出为空，说明脚本执行出错
                if(StringUtils.isBlank(result)){
                    log.info("【得到标准输出为空】n执行的命令如下：n" + cmd);
                    result = processStdout(session.getStderr(), DEFAULT_CHAR_SET);
                }else{
                    log.info("【执行命令成功】n执行的命令如下：n" + cmd);
                }
            }
        } catch (IOException e) {
            log.error("【执行命令失败】n执行的命令如下：n" + cmd + "n" + e.getMessage());
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.close();
            }
            if (session != null) {
                session.close();
            }
        }
        return result;
    }

    
    private static String processStdout(InputStream in, String charset){
        InputStream stdout = new StreamGobbler(in);
        StringBuffer buffer = new StringBuffer();
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(stdout, charset));
            String line = null;
            while((line = br.readLine()) != null){
                buffer.append(line).append("n");
            }
        } catch (IOException e) {
            log.error("解析脚本出错：" + e.getMessage());
            e.printStackTrace();
        }
        return buffer.toString();
    }

    public static void main(String[] args){
        // 输入服务器IP地址
        String ip = "192.168.xx.xxx";
        String userName = "xxx";
        String password = "xxxxx";
        Connection conn =  SshUtil.SshLogin(ip, userName, password);
        String cmd = "cd /home/miracle&&pwd&&ls&&cat lwg.txt";
        String result = SshUtil.execute(conn, cmd);
        log.info(splitStr + "n执行的结果如下: n" + result + splitStr);
        log.info(String.valueOf(conn));
    }
}