Socket

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Socket

Socket

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public class MainServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(4000);
        while (true) {
            Socket socket = serverSocket.accept();
            System.out.println("connect...");
            new ServerInputThread(socket).start();
            new ServeOutputThread(socket).start();
        }
    }
}
public class ServerInputThread extends Thread {
    private Socket socket;
    public ServerInputThread(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        while (true) {
            try {
                InputStream inputStream = socket.getInputStream();
                byte[] bytes = new byte[1024];
                int length = inputStream.read(bytes);
                String str = new String(bytes, 0, length);
                System.out.println("waiting for read...");
                System.out.println(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
public class ServeOutputThread extends Thread {
    private Socket socket;
    public ServeOutputThread(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        while (true) {
            try {
                OutputStream outputStream = socket.getOutputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
                String line = bufferedReader.readLine();
                outputStream.write(line.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
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public class MainClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1",4000);
        new ClientInputThread(socket).start();
        new ClientOutputThread(socket).start();
    }
}
public class ClientInputThread extends Thread {
    private Socket socket;
    public ClientInputThread(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        while (true) {
            try {
                InputStream inputStream = socket.getInputStream();
                byte[] bytes = new byte[1024];
                int length = inputStream.read(bytes);
                String str = new String(bytes, 0, length);
                System.out.println("waiting for read...");
                System.out.println(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
public class ClientOutputThread extends Thread {
    private Socket socket;
    public ClientOutputThread(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        while (true) {
            try {
                OutputStream outputStream = socket.getOutputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
                String line = bufferedReader.readLine();
                outputStream.write(line.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
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public class UdpTest1 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket();
        String str = "hello world";
        DatagramPacket packet = new DatagramPacket(str.getBytes(), str.length(), InetAddress.getByName("localhost"), 7000);
        socket.send(packet);
        byte[] buffer = new byte[1000];
        DatagramPacket packet2 = new DatagramPacket(buffer, 100);
        socket.receive(packet2);
        System.out.println(new String(buffer, 0, packet2.getLength()));
        socket.close();
    }
}
public class UdpTest2 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(7000);
        byte[] buffer = new byte[1000];
        DatagramPacket packet = new DatagramPacket(buffer,1000);
        socket.receive(packet);
        System.out.println(new String(buffer, 0, packet.getLength()));
        String str = "welcome";
        DatagramPacket packet2 = new DatagramPacket(str.getBytes(), str.length(), packet.getAddress(), packet.getPort());
        socket.send(packet2);
        socket.close();
    }
}