JAVA SOCKET

1.私聊形似

发送放： 

                  InetAddress address = InetAddress.getByName(ad);//ad为String，接收方IP地址

                  byte[] message = msg.getBytes();//将发送形象转换为Byte类型

                  DatagramPacket packet = new DatagramPacket(message, message.length,address,9999);//实例化数据包

                  DatagramSocket socket = new DatagramSocket();//实例化套接字

                  socket.send(packet);//发送数据包

接收放：

                 byte[] buffer = new buffer[1024];

                 DatagramPacket packet = new DatagramPacket(buffer, buffer.length);//接收数据包

                 DatagramSocket socket = new DatagramSocket(9999);//端口与发送方一致

                 socket.receive(packet);

                 String s = new String(packet.getData(), 0, packet.getLength());//转为String类型

2.群聊形式：

发送方：

                 InetAddress group = InetAddress.getByName("239.255.8.0");//创建群聊IP

                 byte[] message = msg.getBytes();//将发送形象转换为Byte类型

                 DatagramPacket packet = new DatagramPacket(date, date.length, group, port);//实例化数据包

                 MulticastSocket socket = new MulticastSocket(port);//实例化组播套接字

                 socket.setTimeToLive(1);//指定发送范围是本地网络      

                 socket.joinGroup(group);//加入广播组

                 socket.send(packet);//发送数据

接收方：

                 InetAddress group = InetAddress.getByName("239.255.8.0");//实例化

                 byte[] buffer = new byte[8192];

                 DatagramPacket packet = new DatagramPacket(buffer, buffer.length, group, port);

                 MulticastSocket socket = new MulticastSocket(port);//实例化组播套接字

                 socket.joinGroup(group);//加入广播组

                 socket.receive(packet);

                 String message = new String(packet.getData(), 0, packet.getLength());