InputStream in = null;
OutputStream out = null;
try {
// Check the arguments
if ((args.length != 1) && (args.length != 2))
throw new IllegalArgumentException("Wrong number of arguments");
// Set up the streams
URL url = new URL(args[0]); // Create the URL
in = url.openStream(); // Open a stream to it
if (args.length == 2) // Get an appropriate output stream
out = new FileOutputStream(args[1]);
else out = System.out;
// Now copy bytes from the URL to the output stream
byte[] buffer = new byte[4096];
int bytes_read;
while((bytes_read = in.read(buffer)) != -1)
out.write(buffer, 0, bytes_read);
}
// On exceptions, print error message and usage message.
catch (Exception e) {
System.err.println(e);
System.err.println("Usage: java GetURL <URL> [<filename>]");
}
finally { // Always close the streams, no matter what.
try { in.close(); out.close(); } catch (Exception e) {}
}
