如何在Java中使用Socket编程实现TCP连接?

import java.io.*;
import java.net.*;
public class SocketServerExample {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        int port = 9876; // 服务器监听的端口号
        try (ServerSocket serverSocket = new ServerSocket(port)) {
            System.out.println("服务器正在监听端口 " + port);
            while (true) {
                Socket socket = serverSocket.accept(); // 等待客户端连接
                System.out.println("新客户端已连接");
                // 从 socket 获取输入流
                ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
                String message = (String) ois.readObject();
                System.out.println("收到客户端消息: " + message);
                // 创建输出流并发送响应消息
                ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
                oos.writeObject("Hi Client " + message);
                // 关闭资源
                ois.close();
                oos.close();
                socket.close();
                // 如果客户端发送了 "exit" 请求，终止服务器
                if (message.equalsIgnoreCase("exit")) {
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;
import java.net.*;
public class SocketClientExample {
    public static void main(String[] args) throws UnknownHostException, IOException, ClassNotFoundException {
        String serverAddress = "localhost"; // 服务器地址
        int serverPort = 9876; // 服务器端口号
        Socket socket = new Socket(serverAddress, serverPort);
        System.out.println("已连接到服务器");
        // 创建输入流和输出流
        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
        oos.writeObject("Hello from client");
        // 从服务器接收响应
        ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
        String response = (String) ois.readObject();
        System.out.println("服务器响应: " + response);
        // 关闭资源
        oos.close();
        ois.close();
        socket.close();
    }
}