Java code to connect to unix box(putty)

i'm having a great problem regarding accessing the putty box from java code.
I need to read some log files from unix through java code.In my client program when i'm giving hostname and port=22...ssh terminal is getting detected,but i'm confused how to open that unix box by giving the username and password.and how am i goin to embed unix command in it.The entire job i've to do through java code.
please help!!..Thanks
Message was edited by:
Message was edited by:

thanks a lot guys for ur time...but i tried in every way..i'm getting hell lot of errors..please help..its really urgent
/*this is my code:*/
import com.jcraft.jsch.*;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UserInfo;
public class shell_test {
public static void main(String args[])
String user="user15";
String host="punlin040";
String cmd="ls -l";
JSch jsch = new JSch();
Session session=jsch.getSession(user,host,22);
//UserInfo usrInfo=new MyUserInfo();
Channel channel=session.openChannel("exec");
((ChannelExec) channel).setCommand(cmd);
// channel.setOutputStream(System.out);
//((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
byte[] tmp = new byte[1024];
while (true)
while (in.available() > 0)
int i =, 0, 1024);
if (i < 0)
System.out.print(new String(tmp, 0, i));
if (channel.isClosed())
// System.out.println("JSCH: exit-status: " +
catch (Exception ee)
}catch(Exception e)
{e.printStackTrace(); }
/*public static class MyUserInfo implements UserInfo {
public String getPassword()
{ return "password"; }
public String getPassphrase()
{ return ""; }
public boolean promptPassword(String arg0)
{ return true; }
public boolean promptPassphrase(String arg0)
{ return true; }
public boolean promptYesNo(String arg0)
{ return true; }
public void showMessage(String arg0)
but i'm getting following errors:
com.jcraft.jsch.JSchException: java.lang.ClassNotFoundException: com.jcraft.jsch
at com.jcraft.jsch.Session.connect(
at com.jcraft.jsch.Session.connect(
at shell_test.main(
Caused by: java.lang.ClassNotFoundException: com.jcraft.jsch.jce.Random
at$ Source)
at Method)
at Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.jcraft.jsch.Session.connect(
... 2 more

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