Inserting the computer name into the output file?

Pardon my ignorance, but how would I modify my script to test this? What I have now is this:

import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

String getDateTime()
{
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-d");
Date date = new Date();
return dateFormat.format(date);
}

String prepareStringForOutput( String value )
{
if (value != null)
{
value = value.replaceAll("\"", "\'");
value = value.replaceAll("&", "&");
value = value.replaceAll(" ", " ");
value = value.trim();
}
return ( (value==null || value.equals( " " ))? "" : value );
}

// Set name of file to write to. the session variable "CSV_NAME" should be declared in another script such as an init script.
outputFile = "output/" + "Session1_" + getDateTime() + ".csv";