使用ServerSocket类和Socket类以及InetAddress类编写一个GUI实现一个简单的聊天程序

好的，以下是一个简单的聊天程序的实现步骤：

1. 创建一个GUI窗口，包含一个文本框用于显示聊天记录、一个文本框用于输入要发送的消息以及一个“发送”按钮。

2. 在后台创建一个ServerSocket对象，用于监听来自其他客户端的连接请求。当有新的连接请求时，创建一个新的Socket对象来处理该连接。

3. 在客户端使用Socket对象连接到服务器。

4. 当客户端发送消息时，将消息发送到服务器，服务器将消息转发给所有其他客户端。

5. 当有消息到达时，更新GUI上的聊天记录文本框。

以下是Java代码实现：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ChatServer extends JFrame implements ActionListener {

    private JTextArea chatArea;
    private JTextField inputField;
    private JButton sendButton;

    private ServerSocket serverSocket;
    private Socket clientSocket;
    private BufferedReader in;
    private PrintWriter out;

    public ChatServer() {
        initGUI();
        startServer();
    }

    private void initGUI() {
        chatArea = new JTextArea();
        chatArea.setEditable(false);
        add(chatArea, BorderLayout.CENTER);

        inputField = new JTextField();
        add(inputField, BorderLayout.SOUTH);

        sendButton = new JButton("发送");
        sendButton.addActionListener(this);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(sendButton);
        add(buttonPanel, BorderLayout.EAST);

        setTitle("聊天室服务器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private void startServer() {
        try {
            serverSocket = new ServerSocket(8888);
            InetAddress address = InetAddress.getLocalHost();
            chatArea.append("服务器地址：" + address + "\n");
            chatArea.append("等待客户端连接...\n");
            clientSocket = serverSocket.accept();
            chatArea.append("客户端连接成功，IP地址：" + clientSocket.getInetAddress().getHostAddress() + "\n");

            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            out = new PrintWriter(clientSocket.getOutputStream(), true);

            Thread messageThread = new Thread(new MessageThread());
            messageThread.start();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void sendMessage() {
        String message = inputField.getText();
        out.println(message);
        chatArea.append("我：" + message + "\n");
        inputField.setText("");
    }

    private class MessageThread implements Runnable {
        @Override
        public void run() {
            try {
                while (true) {
                    String message = in.readLine();
                    chatArea.append("客户端：" + message + "\n");
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == sendButton) {
            sendMessage();
        }
    }

    public static void main(String[] args) {
        new ChatServer();
    }
}

客户端代码：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ChatClient extends JFrame implements ActionListener {

    private JTextArea chatArea;
    private JTextField inputField;
    private JButton sendButton;

    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    public ChatClient() {
        initGUI();
        connectToServer();
    }

    private void initGUI() {
        chatArea = new JTextArea();
        chatArea.setEditable(false);
        add(chatArea, BorderLayout.CENTER);

        inputField = new JTextField();
        add(inputField, BorderLayout.SOUTH);

        sendButton = new JButton("发送");
        sendButton.addActionListener(this);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(sendButton);
        add(buttonPanel, BorderLayout.EAST);

        setTitle("聊天室客户端");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 500);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private void connectToServer() {
        try {
            socket = new Socket("localhost", 8888);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);

            Thread messageThread = new Thread(new MessageThread());
            messageThread.start();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void sendMessage() {
        String message = inputField.getText();
        out.println(message);
        chatArea.append("我：" + message + "\n");
        inputField.setText("");
    }

    private class MessageThread implements Runnable {
        @Override
        public void run() {
            try {
                while (true) {
                    String message = in.readLine();
                    chatArea.append("服务器：" + message + "\n");
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == sendButton) {
            sendMessage();
        }
    }

    public static void main(String[] args) {
        new ChatClient();
    }

}

注意：在使用时需要先启动服务器，再启动客户端。