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Struts & Hibernate
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| | | use of RunTime class | use of RunTime class 2003-07-28 - By Prashant
Back
Hi Group,
We are developing an application which requires connecting to the remote
server using ssh protocol. If I have to connect to that server from command
prompt then I type command something like below,
ssh -l <usrname> -p <portname> <ip address>
Then the system shows following line
<Hostname> password:
Then the remote server ask for password (We don't want to use public and
private key automatic validation) ,which I enter manually and I get the
connection to the remote server.
Now the same functionality we want to duplicate in a java program. So we
thought of using Runtime class to execute the command mentioned above. The
sample code for that is given below
import java.io.*;
public class one{
public one() throws Exception{
Runtime run=Runtime.getRuntime();
System.out.println("came here up");
Process pr=run.exec("ssh -l <usrname> -p <portname> <ip address>"
);
System.out.println("came here down");
InputStream in=pr.getInputStream();
System.out.println(in.available());
BufferedReader buff=new BufferedReader(new InputStreamReader(pr
.getInputStream()));
System.out.println("1");
String line=buff.readLine();
System.out.println("2");
System.out.println(line);
}
public static void main(String a[]){
try{
new one();
}catch(Exception ee){
ee.printStackTrace();
}
}
}//end of class
We are getting output till 'System.out.println("1")' , but the ' System.out
.println("2") ' is not coming at all on the screen. The process remains in the
hanged status and I think it expects some user input. But I don't understand
why it is not printing '<Hostname> password: ' line though I am
capturing the input stream of the process.
Can anyone tell me why this is happening. If anybody has already
implemented such kind of functionality where 'java program will supply the
password to connect to the remote server' then kindly suggest us how to do
that.
Thanx in advance
Prashant
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<DIV><FONT face=Verdana size=2>Hi Group,</FONT></DIV>
<DIV><FONT face=Verdana size=2> We are developing an
application which requires connecting to the remote server using ssh protocol.
If I have to connect to that server from command prompt then I type command
something like below,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> <FONT
color=#ff0000>ssh -l <usrname> -p <portname> <ip
address></FONT></FONT></DIV>
<DIV><FONT face=Verdana size=2> Then the
system shows following line</FONT></DIV>
<DIV><FONT face=Verdana
size=2> <FONT
color=#ff0000><Hostname> password:
</FONT></FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> Then the remote server ask
for
password (We don't want to use public and private key automatic validation)
,which I enter manually and I get the connection to the remote
server.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> Now the same functionality we
want to duplicate in a java program. So we thought of using Runtime class to
execute the command mentioned above. The sample code for that is given
below</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> import
java.io.*;<BR></FONT></DIV>
<DIV><FONT face=Verdana size=2> public class one{</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2>
public one() throws Exception{<BR>
Runtime
run=Runtime.getRuntime();<BR>
System.out.println("came here
up");<BR>
Process pr=run.exec("ssh -l <usrname> -p <portname> <ip
address>");<BR>
System.out.println("came here
down");<BR>
InputStream in=pr.getInputStream();<BR>
System.out.println(in.available());<BR>
BufferedReader buff=new BufferedReader
(new
InputStreamReader(pr.getInputStream()));<BR>
System.out.println("1");<BR>
String
line=buff.readLine();<BR>
System.out.println("2");<BR></FONT><FONT face=Verdana
size=2>
System.out.println(line);<BR>
}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2>
public static void main(String a[]){<BR>
try{<BR>
new
one();<BR>
}catch(Exception ee){<BR>  
;
ee.printStackTrace();<BR>
}<BR>
}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> }//end of class</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> We are getting output
till 'System.out.println("1")' , but the ' System.out.println("2") ' is not
coming at all on the screen. The process remains in the hanged status and
I
think it expects some user input. But I don't understand why it is not
printing '<Hostname> password:
'
line though I am capturing the input stream of the process.</FONT></DIV>
<DIV><FONT face=Verdana size=2></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2> Can anyone tell me why
this is happening. If anybody has already implemented such kind of
functionality where 'java program will supply the password to connect to the
remote server'</FONT> <FONT face=Verdana size=2> then kindly suggest
us how to do that.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2>Thanx in advance</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Verdana size=2>Prashant</FONT></DIV></BODY></HTML>
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