public static void test_connect_host() throws Exception {        SimpleDateFormat date_format = new SimpleDateFormat("yyyyMMdd_HHmmss");        String[] host_ip_list = new String[] { "192.168.2.179", "192.168.17.5", };        String[] host_password_list = new String[] { "", "", };        String[] identity_password_list = new String[] { "", "", };        int[] host_port_list = new int[] { 22, 51255, };        String[] connect_type_list = new String[] { "password", "publickey", };        String host_user = "root";        //        for (int i = 0; i < host_ip_list.length; i++) {            String host_ip = host_ip_list[i];            int host_port = host_port_list[i];            String host_password = host_password_list[i];            String identity_password = identity_password_list[i];            String connect_type = connect_type_list[i];                        JSch jsch = new JSch();            Session session = null;                        // 连接机器ssh , 指定某种方式            /*                                      if (connect_type.equalsIgnoreCase("password")) {                         session = jsch.getSession(host_user, mysql_host, host_port);                         session.setPassword(host_password);                         } else if (connect_type.equalsIgnoreCase("publickey")) {                         jsch.addIdentity("D:\\tmp\\admin_id_dsa_private.private", "");                         session = jsch.getSession(host_user, mysql_host, host_port);                         } else {                         continue;                         }                         UserInfo ui = new LocalUserInfo();                         session.setUserInfo(ui);                                                 Hashtable<String, String> config = new Hashtable<String,                         String>();                         config.put("StrictHostKeyChecking", "no");                         session.setConfig(config);                                                 session.connect();            */            // 遍历所有的方式 , 成功即可            boolean connectflag = false;            for (int j = 0; j < connect_type_list.length; j++) {                String v_connect_type = connect_type_list[i];                try {                    if (v_connect_type.equalsIgnoreCase("password")) {                        session = jsch.getSession(host_user, host_ip, host_port);                        session.setPassword(host_password);                    } else if (v_connect_type.equalsIgnoreCase("publickey")) {                        jsch.addIdentity("D:\\tmp\\admin_id_dsa_private.private", identity_password);                        session = jsch.getSession(host_user, host_ip, host_port);                    } else {                        continue;                    }                    UserInfo vui = new LocalUserInfo();                    session.setUserInfo(vui);                    Hashtable<String, String> vconfig = new Hashtable<String, String>();                    vconfig.put("StrictHostKeyChecking", "no");                    session.setConfig(vconfig);                    session.connect();                    connectflag = true;                    break;                } catch (Exception e) {                    // TODO: handle exception                }            }            if (connectflag == false) {                continue;            }            // 统一的方式            /*            jsch.addIdentity("D:\\tmp\\admin_id_dsa_private.private");                        session = jsch.getSession(host_user, host_ip, host_port);                        session.setPassword(host_password);                        Properties config = new Properties();                        config.put("StrictHostKeyChecking", "no");                        session.setConfig(config);                        session.setTimeout(60);                        session.connect();*/            // 执行命令            String execstr = "ls -lU --full-time --time-style=‘+%F_%T‘ ~";            System.out.println(date_format.format(new Date()) + " \t " + execstr);            Channel channel = session.openChannel("exec");            ((ChannelExec) channel).setCommand(execstr);            InputStream in = channel.getInputStream();            channel.connect();            int nextChar;            StringBuffer sb = new StringBuffer();            while (true) {                while ((nextChar = in.read()) != -1) {                    sb.append((char) nextChar);                }                if (channel.isClosed()) {                    // System.out.println("exit-status: " +                    // channel.getExitStatus());                    break;                }                try {                    Thread.sleep(1000);                } catch (Exception ee) {                    ee.printStackTrace();                }            }            String ret = sb.toString();            System.out.println(ret);            if (channel != null) {                channel.disconnect();            }            if (session != null) {                session.disconnect();            }        }        System.out.println("======================== successfully ========================");    }