如何执行linux命令“dzdo su - john”通过JSch java api并执行一些命令，如“ls -ltr”和在那个用户上 [英] How to execute linux command "dzdo su - john" through JSch java api and execute some commands like "ls -ltr" on that user

问题描述

我想使用java jsch库连接到远程linux服务器，并使用命令dzdo su - john切换到另一个用户，我想在该用户上执行一些命令。我已经尝试了几种方法来满足这个要求，但我无法做到这一点，任何人都可以提供帮助。

I want to connect to the remote linux server using java jsch library and switch to another user using command dzdo su - john and I want to execute some commands on that user. I have tried several ways on this requirement but I am unable to do this could any one help on this.

 public static void main(String args[])
    {
    String host="xxxxx.yyyy.com";
    String user="user";
    String password="password";
    String command1="dzdo su - lucy";
    try{    
        java.util.Properties config = new java.util.Properties(); 
        config.put("StrictHostKeyChecking", "no");
        JSch jsch = new JSch();
        Session session=jsch.getSession(user, host, 22);
        session.setPassword(password);
        session.setConfig(config);
        session.connect();
        System.out.println("Connected");

        Channel channel=session.openChannel("shell");
        OutputStream ops = channel.getOutputStream();
        PrintStream ps = new PrintStream(ops, true);

         channel.connect();
         ps.println(command1);
         ps.println("ls -ltr");
        InputStream in=channel.getInputStream();
        byte[] tmp=new byte[1024];
        while(true){
          while(in.available()>0){
            int i=in.read(tmp, 0, 1024);
            if(i<0)break;
            System.out.print(new String(tmp, 0, i));
          }
          if(channel.isClosed()){
            System.out.println("exit-status: "+channel.getExitStatus());
            break;
          }
          try{Thread.sleep(1000);}catch(Exception ee){}
        }
        channel.disconnect();
        session.disconnect();
        System.out.println("DONE");
    }catch(Exception e){
        e.printStackTrace();
    }
}

    }

执行这段代码我得到这样的输出，程序没有暂停

by executing this code I am getting an output like this and the program is not halting

 Connected
Last login: Thu Oct  4 13:24:38 2018 from xx.xx.xxx.xx

    $  dzdo su - lucy
    [e-mail]:/u/zr1.xxxx.com/lucy $ 

命令ls -ltr未执行。该程序在语句中将无限循环，而（true）{--- code ---}

the command ls -ltr was not executing. The program was going to infinite loop in the statement while(true){---code---}

推荐答案

它可能是一个时间问题。

It might be a timing issue.

考虑在两个 println 之间添加 Thread.sleep 电话。

Consider adding Thread.sleep between the two println calls.

ps.println(command1);
Thread.sleep(1000);
ps.println("ls -ltr");

---

或尝试禁用PTY：

---

Or try disabling PTY:

((ChannelShell)channel).setPty(false);
channel.connect();

如果可行的话，这是一个比延迟更强大的解决方案。

If that works, it's a more robust solution than the delay.

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