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，我可以为您提供一些帮助。这是一个简单的聊天程序的Java代码。该程序使用ServerSocket类和Socket类以及InetAddress类来建立连接并发送消息。GUI使用Java Swing库来创建。

import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SimpleChat extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private JTextField userText;
    private JTextArea chatWindow;
    private ObjectOutputStream output;
    private ObjectInputStream input;
    private ServerSocket server;
    private Socket connection;

    public SimpleChat() {
        super("Simple Chat");
        userText = new JTextField();
        userText.setEditable(false);
        userText.addActionListener(this);
        add(userText, BorderLayout.NORTH);
        chatWindow = new JTextArea();
        add(new JScrollPane(chatWindow), BorderLayout.CENTER);
        setSize(300, 150);
        setVisible(true);
    }

    public void startRunning() {
        try {
            server = new ServerSocket(6789, 100);
            while (true) {
                try {
                    waitForConnection();
                    setupStreams();
                    whileChatting();
                } catch (EOFException eofException) {
                    showMessage("\n Connection terminated. ");
                } finally {
                    closeChat();
                }
            }
        } catch (IOException ioException) {
            ioException.printStackTrace();
        }
    }

    private void waitForConnection() throws IOException {
        showMessage(" Waiting for someone to connect... \n");
        connection = server.accept();
        showMessage(" Now connected to " + connection.getInetAddress().getHostName());
    }

    private void setupStreams() throws IOException {
        output = new ObjectOutputStream(connection.getOutputStream());
        output.flush();
        input = new ObjectInputStream(connection.getInputStream());
        showMessage("\n Streams are now setup! \n");
    }

    private void whileChatting() throws IOException {
        String message = " You are now connected! ";
        sendMessage(message);
        ableToType(true);
        do {
            try {
                message = (String) input.readObject();
                showMessage("\n" + message);
            } catch (ClassNotFoundException classNotFoundException) {
                showMessage("\n Unknown data received! ");
            }
        } while (!message.equals("CLIENT - END"));
    }

    private void closeChat() {
        showMessage("\n Closing connection... \n");
        ableToType(false);
        try {
            output.close();
            input.close();
            connection.close();
        } catch (IOException ioException) {
            ioException.printStackTrace();
        }
    }

    private void sendMessage(String message) {
        try {
            output.writeObject("SERVER - " + message);
            output.flush();
            showMessage("\nSERVER - " + message);
        } catch (IOException ioException) {
            chatWindow.append("\n ERROR: Message cannot be sent! \n");
        }
    }

    private void showMessage(final String text) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                chatWindow.append(text);
            }
        });
    }

    private void ableToType(final boolean tof) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                userText.setEditable(tof);
            }
        });
    }

    public void actionPerformed(ActionEvent event) {
        sendMessage(userText.getText());
        userText.setText("");
    }

    public static void main(String[] args) {
        SimpleChat server = new SimpleChat();
        server.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        server.startRunning();
    }
}

这个程序可以作为服务器运行。如果您需要作为客户端运行，只需将“SERVER -”替换为“CLIENT -”即可。请注意，此程序仅供学习和实验目的使用，不应用于生产环境中。