Java socket (tcp/udp) example

socket.java

/*--------------------------------------------------------------------
 * 
 * TCP Socket client
 * 
 *------------------------------------------------------------------*/
String host = "0.0.0.0";
int port    = 50236;
InetAddress server = InetAddress.getByName(host);
Socket socket = new Socket(server, port);
String message = "this is message";

//setup the read (in) and write (out)
out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

/*--------------------------------------------------------------------
 * 
 * TCP Socket server
 * 
 *------------------------------------------------------------------*/
ServerSocket serverSocket = new ServerSocket(6789);
while (true) {
   Socket client = serverSocket.accept();
   BufferedReader inFromClient =
    new BufferedReader(new InputStreamReader(client.getInputStream()));
   DataOutputStream outToClient = new DataOutputStream(client.getOutputStream());
}

/*--------------------------------------------------------------------
 * 
 * UDP Broadcast Socket
 * 
 *------------------------------------------------------------------*/ 
public static void broadcast(String broadcastMessage, InetAddress address, int port) throws IOException {
DatagramSocket socket = new DatagramSocket();
socket.setBroadcast(true);
byte[] buffer = broadcastMessage.getBytes();
  
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, address, port);
socket.send(packet);

byte[] buf = new byte[256];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
        socket.close();
}