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java网络编程中tcp和udp

在网络编程中,先启动service,再启动clent。
1.tcp
服务端
public class Service {
public static void main(String[] args) throws Exception {
ServerSocket ss = new ServerSocket(6666);
System.out.println("等待");
while (true) {
Socket socket  =ss.accept();
InputStream is = socket.getInputStream();
DataInputStream dataInputStream = new DataInputStream(is);
System.out.println(dataInputStream.readUTF());
dataInputStream.close();
socket.close();
}
}
}
客户端
public class CientSocket {
public static void main(String[] args) throws Exception {
Socket socket = new Socket("127.0.0.1",6666);
OutputStream outputStream = socket.getOutputStream();
DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
dataOutputStream.writeUTF("333333333");
dataOutputStream.flush();
dataOutputStream.close();
socket.close();
}
}
udp通信,是不区分客户端和服务端的
public class Service {
public static void main(String[] args) throws Exception {
byte buf[] = new byte[1024];
DatagramPacket dPacket = new DatagramPacket(buf, buf.length);
DatagramSocket dSocket = new DatagramSocket(5678);
while (true) {
dSocket.receive(dPacket);
System.out.println(new String(buf,0,dPacket.getLength()));
}
}
}
public class UdpClient {
public static void main(String[] args) throws Exception{
while (true) {
byte[] buf = (new String("hello")).getBytes();
DatagramPacket dpPacket = new DatagramPacket(buf, buf.length, new InetSocketAddress("127.0.0.1", 5678));
//自己占用9999端口
DatagramSocket dSocket = new DatagramSocket(9999);
dSocket.send(dpPacket);
dSocket.close();
}
}
}

posted on 2013-04-02 22:28 杨军威 阅读(128) 评论(0)  编辑  收藏


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