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Code for exec of system commands

  Asked By: Rena    Date: Aug 21    Category: Java    Views: 950
  

package stkpackage1;

import java.util.*;
import java.io.*;
import stkpackage1.StreamHandler;

public class ExecCmd1
{

public static void main(String args[])
{
new ExecCmd1().runmain(args);
}

public void runmain(String args[])
{
if (args.length < 1)
{
System.out.println("USAGE: java ExecCmd1 <cmd>");
System.exit(1);
}

try
{
String osName = System.getProperty("os.name" );
System.out.println("OS: " + osName);
String[] cmd = new String[3];

if( osName.equals( "Windows NT" ) )
{
cmd[0] = "cmd.exe" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}
else if( osName.equals( "Windows 95" ) )
{
cmd[0] = "command.com" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}
else if( osName.equals( "Windows 2000" ) )
{
cmd[0] = "cmd" ;
cmd[1] = "/C" ;
cmd[2] = args[0];
}
else if( osName.equals( "Linux" ) )
{
cmd[0] = "/bin/sh" ;
cmd[1] = "-c";
cmd[2] = args[0];
}

Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0] + " " + cmd[1] + " " +
cmd[2]);
Process proc = rt.exec(cmd);
// any error message?
StreamHandler errorGobbler = new
StreamHandler(proc.getErrorStream(), "ERROR");
// any output?
StreamHandler outputGobbler = new
StreamHandler(proc.getInputStream(), "OUTPUT");

// kick them off
errorGobbler.start();
outputGobbler.start();

// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
} catch (Throwable t)
{
t.printStackTrace();
}
}
}





package stkpackage1;

import java.util.*;
import java.io.*;

public class StreamHandler extends Thread
{
InputStream is;
String type;

StreamHandler(InputStream is, String type)
{
this.is = is;
this.type = type;
}

public void run()
{
try
{
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + ">" + line);
} catch (IOException ioe)
{
ioe.printStackTrace();
}
}

}

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