深入了解Java中的网络编程与Socket通信

package cn.juwatech.network;
import java.io.*;
import java.net.*;
public class TCPClient {
    public static void main(String[] args) {
        String serverName = "localhost";
        int port = 8080;
        try {
            Socket socket = new Socket(serverName, port);
            OutputStream outputStream = socket.getOutputStream();
            PrintWriter out = new PrintWriter(outputStream, true);
            out.println("Hello, Server!");
            InputStream inputStream = socket.getInputStream();
            BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
            String response = in.readLine();
            System.out.println("Server response: " + response);
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
package cn.juwatech.network;
import java.io.*;
import java.net.*;
public class TCPServer {
    public static void main(String[] args) {
        int port = 8080;
        try {
            ServerSocket serverSocket = new ServerSocket(port);
            System.out.println("Server listening on port " + port);
            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("Client connected: " + socket.getInetAddress());
                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                String message = in.readLine();
                System.out.println("Received from client: " + message);
                PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
                out.println("Message received");
                socket.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package cn.juwatech.network;
import java.io.*;
import java.net.*;
public class UDPClient {
    public static void main(String[] args) {
        String serverName = "localhost";
        int port = 9876;
        try {
            DatagramSocket socket = new DatagramSocket();
            InetAddress serverAddress = InetAddress.getByName(serverName);
            String message = "Hello, Server!";
            byte[] sendData = message.getBytes();
            DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, port);
            socket.send(sendPacket);
            byte[] receiveData = new byte[1024];
            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
            socket.receive(receivePacket);
            String response = new String(receivePacket.getData(), 0, receivePacket.getLength());
            System.out.println("Server response: " + response);
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
package cn.juwatech.network;
import java.io.*;
import java.net.*;
public class UDPServer {
    public static void main(String[] args) {
        int port = 9876;
        try {
            DatagramSocket socket = new DatagramSocket(port);
            System.out.println("Server listening on port " + port);
            while (true) {
                byte[] receiveData = new byte[1024];
                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
                socket.receive(receivePacket);
                String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
                System.out.println("Received from client: " + message);
                InetAddress clientAddress = receivePacket.getAddress();
                int clientPort = receivePacket.getPort();
                String response = "Message received";
                byte[] sendData = response.getBytes();
                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientPort);
                socket.send(sendPacket);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}