int port = DEFAULT_PORT;
Socket s = null;
// Parse the port specification
if ((args.length != 1) && (args.length != 2)) usage();
if (args.length == 1) port = DEFAULT_PORT;
else {
try { port = Integer.parseInt(args[1]); }
catch (NumberFormatException e) { usage(); }
}
try {
// Create a socket to communicate to the specified host and port
s = new Socket(args[0], port);
// Create streams for reading and writing lines of text
// from and to this socket.
DataInputStream sin = new DataInputStream(s.getInputStream());
PrintStream sout = new PrintStream(s.getOutputStream());
// Create a stream for reading lines of text from the console
DataInputStream in = new DataInputStream(System.in);
// Tell the user that we've connected
System.out.println("Connected to " + s.getInetAddress()
+ ":"+ s.getPort());
String line;
while(true) {
// print a prompt
System.out.print("> ");
System.out.flush();
// read a line from the console; check for EOF
line = in.readLine();
if (line == null) break;
// Send it to the server
sout.println(line);
// Read a line from the server.
line = sin.readLine();
// Check if connection is closed (i.e. for EOF)
if (line == null) {
System.out.println("Connection closed by server.");
break;
}
// And write the line to the console.
System.out.println(line);
}
}
catch (IOException e) { System.err.println(e); }
// Always be sure to close the socket
finally {
try { if (s != null) s.close(); } catch (IOException e2) { ; }
}
