Access UNIX server and run a shell script from java application

Question

I have got one requirement where i have to access a unix server and on that server i have to run a shell script with some parameter from my java application. Please suggest some solution with example.

i have tried something but it is not working.

SshWrapper ssh = new SshWrapper();
 try {  
        ssh.connect("10.206.19.80", 22);  
        ssh.login("*****","*****");  

        ssh.setPrompt("c898vqz:~");  
        ssh.waitfor("#");
        System.out.println("PWD**********"+ssh.send("pwd"));  

        ssh.disconnect();
        System.out.println(ssh.getClass());
    } catch (java.io.IOException e) {  
        e.printStackTrace();  
    }

getting null from ssh.send("pwd")

possible duplicate of Executing a shell script with an empty argument from Java — sanbhat
– sanbhat, Commented Aug 23, 2013 at 11:06
Does anybody have any solution for it instead of down voting this question. If you required any other information i am ready provide. — Shibankar
– Shibankar, Commented Aug 23, 2013 at 11:09
@sanbhat does not look like a duplicate . The code in link run on the same server where command needs to be run while this question is asking how to connect to a different unix server . — Yogesh Kumar Gupta
– Yogesh Kumar Gupta, Commented Dec 13, 2020 at 6:54

Darshil Shah · Accepted Answer · 2020-12-02 05:53:53Z

2

You could use SSH component JCraft for remote connection and shell commands invocations:

import com.jcraft.jsch.*

Exerp from my old code:

JSch jsch = new JSch();

String command = "/tmp/myscript.sh";
Session session = jsch.getSession(user, host, 22);
session.connect();

Channel channel = session.openChannel("exec");
((ChannelExec)channel).setCommand(command);

channel.setInputStream(null);
((ChannelExec)channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
channel.connect();

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()) {
      if (channel.getExitStatus() == 0) {
          System.out.println("Command executed successully.");
      }
      break;
  }
}
channel.disconnect();
session.disconnect();

You can also easily transfer files via session.openChannel("sftp").

ooph.. in java it is too wordy, than e.g. in ruby or python :)

edited Dec 2, 2020 at 5:53

Darshil Shah

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answered Aug 23, 2013 at 11:06

rook

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1 Comment

Harshita Sethi Over a year ago

I an trying to run FNDLOAD utility (already installed on server) using this code. But It gives me command not found error. Can you help in running FNDLOAD command.

adiga · Accepted Answer · 2017-11-09 15:41:07Z

1

JSch js = new JSch();
Session s = js.getSession("username", "ip", port);
s.setPassword("password");
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
s.setConfig(config);
s.connect();
System.out.println("connection ");
Channel c = s.openChannel("sftp");
ChannelSftp ce = (ChannelSftp) c;

ce.connect();
System.out.println("connection ");
ce.disconnect();
s.disconnect();

edited Nov 9, 2017 at 15:41

adiga

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answered Jul 21, 2017 at 4:15

Rajat Kumar

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1 Comment

Fady Saad Over a year ago

please, do not just post the code without specify the code i details in able to clarify your code.

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