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    <p><strong>The following code example written in Java will allow you to execute any command on a foreign computer through SSH from within a java program. You will need to include the com.jcraft.jsch jar file.</strong></p> <pre><code> /* * SSHManager * * @author cabbott * @version 1.0 */ package cabbott.net; import com.jcraft.jsch.*; import java.io.IOException; import java.io.InputStream; import java.util.logging.Level; import java.util.logging.Logger; public class SSHManager { private static final Logger LOGGER = Logger.getLogger(SSHManager.class.getName()); private JSch jschSSHChannel; private String strUserName; private String strConnectionIP; private int intConnectionPort; private String strPassword; private Session sesConnection; private int intTimeOut; private void doCommonConstructorActions(String userName, String password, String connectionIP, String knownHostsFileName) { jschSSHChannel = new JSch(); try { jschSSHChannel.setKnownHosts(knownHostsFileName); } catch(JSchException jschX) { logError(jschX.getMessage()); } strUserName = userName; strPassword = password; strConnectionIP = connectionIP; } public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName) { doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName); intConnectionPort = 22; intTimeOut = 60000; } public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName, int connectionPort) { doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName); intConnectionPort = connectionPort; intTimeOut = 60000; } public SSHManager(String userName, String password, String connectionIP, String knownHostsFileName, int connectionPort, int timeOutMilliseconds) { doCommonConstructorActions(userName, password, connectionIP, knownHostsFileName); intConnectionPort = connectionPort; intTimeOut = timeOutMilliseconds; } public String connect() { String errorMessage = null; try { sesConnection = jschSSHChannel.getSession(strUserName, strConnectionIP, intConnectionPort); sesConnection.setPassword(strPassword); // UNCOMMENT THIS FOR TESTING PURPOSES, BUT DO NOT USE IN PRODUCTION // sesConnection.setConfig("StrictHostKeyChecking", "no"); sesConnection.connect(intTimeOut); } catch(JSchException jschX) { errorMessage = jschX.getMessage(); } return errorMessage; } private String logError(String errorMessage) { if(errorMessage != null) { LOGGER.log(Level.SEVERE, "{0}:{1} - {2}", new Object[]{strConnectionIP, intConnectionPort, errorMessage}); } return errorMessage; } private String logWarning(String warnMessage) { if(warnMessage != null) { LOGGER.log(Level.WARNING, "{0}:{1} - {2}", new Object[]{strConnectionIP, intConnectionPort, warnMessage}); } return warnMessage; } public String sendCommand(String command) { StringBuilder outputBuffer = new StringBuilder(); try { Channel channel = sesConnection.openChannel("exec"); ((ChannelExec)channel).setCommand(command); InputStream commandOutput = channel.getInputStream(); channel.connect(); int readByte = commandOutput.read(); while(readByte != 0xffffffff) { outputBuffer.append((char)readByte); readByte = commandOutput.read(); } channel.disconnect(); } catch(IOException ioX) { logWarning(ioX.getMessage()); return null; } catch(JSchException jschX) { logWarning(jschX.getMessage()); return null; } return outputBuffer.toString(); } public void close() { sesConnection.disconnect(); } } </code></pre> <p>For testing.</p> <pre><code> /** * Test of sendCommand method, of class SSHManager. */ @Test public void testSendCommand() { System.out.println("sendCommand"); /** * YOU MUST CHANGE THE FOLLOWING * FILE_NAME: A FILE IN THE DIRECTORY * USER: LOGIN USER NAME * PASSWORD: PASSWORD FOR THAT USER * HOST: IP ADDRESS OF THE SSH SERVER **/ String command = "ls FILE_NAME"; String userName = "USER"; String password = "PASSWORD"; String connectionIP = "HOST"; SSHManager instance = new SSHManager(userName, password, connectionIP, ""); String errorMessage = instance.connect(); if(errorMessage != null) { System.out.println(errorMessage); fail(); } String expResult = "FILE_NAME\n"; // call sendCommand for each command and the output //(without prompts) is returned String result = instance.sendCommand(command); // close only after all commands are sent instance.close(); assertEquals(expResult, result); } </code></pre>
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