java连接远程服务器并执行命令

public static void executeCommand(String command,String host,String username,String password){
		Connection conn = null;
		Session session = null;
		try {
			logger.info("执行linux命令：{},host:{}",command,host);
			conn = new Connection(host);
            conn.connect();
            boolean flg = conn.authenticateWithPassword(username, password);
            if(flg){
            	session = conn.openSession();

                session.requestPTY("bash");
                session.startShell();
                PrintWriter out = new PrintWriter(session.getStdin());
                out.println(command);
                out.flush();
                out.println("exit");
                out.close();
                session.waitForCondition(ChannelCondition.CLOSED | ChannelCondition.EOF | ChannelCondition.EXIT_STATUS,
                        60000);
            }else{
            	logger.info("连接host{}失败",host);
            }
		} catch (IOException e) {
			logger.info("host{}执行命令：{}出现异常"+e,host,command);
		}finally {
			session.close(); 
			conn.close();
		}

	}