System.out.println( "This program will read, and echo the tokens from a file\n" );
// First, get a file name for the user
BufferedReader is = new BufferedReader(
new InputStreamReader( System.in ) );
String filename = null;
BufferedReader fis = null;
System.out.print( "Please enter a the file name : " );
while( true )
{
try
{ filename = is.readLine();
}
catch( IOException ioe )
{ ioe.printStackTrace();
System.exit( -1 );
}
// Now to open the external file
try
{ fis = new BufferedReader( new FileReader( filename ) );
break;
}
catch( FileNotFoundException fnf )
{ System.out.print( "File not found, try again : " );
continue;
}
}
System.out.println( "File " + filename + " opened successfully." );
// Now process the tokens on a line-by-line basis
System.out.print( "\nListing tokens : \n" );
String instring = null;
StringTokenizer st = null;
String item = null;
int lineNo = 0;
mainloop:
while( true )
{ try
{ instring = fis.readLine();
if( instring == null ) // eof reached
{ break mainloop;
}
lineNo++;
System.out.println( "Line #" + lineNo + " : " + instring);
}
catch( IOException ioe )
{ ioe.printStackTrace();
break mainloop;
}
// Got a line OK, so take it to pieces:
st = new StringTokenizer( instring );
while( st.hasMoreTokens() )
{ try
{ item = st.nextToken();
System.out.println( "\t" + item );
}
catch( NoSuchElementException nse )
{ // Shouldn't be thrown but ...
nse.printStackTrace();
continue mainloop;
}
}
} // end while
try
{ fis.close();
}
catch( IOException ioe )
{ ioe.printStackTrace();
// no other action this time - it is the end anyway
}
System.out.println( "\n*** End of File ***\n" );
