Java实现使用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

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首先，我们需要了解一下 ServerSocket、Socket 和 InetAddress 这三个类的作用：

- ServerSocket：用于监听客户端的连接请求，并创建对应的 Socket 对象进行通信。
- Socket：用于与服务器建立连接并进行通信。
- InetAddress：用于表示 IP 地址。

接下来，我们可以开始编写聊天程序了。下面是一个简单的 Java 聊天程序的代码：

1. 服务器端代码：

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

public class Server extends JFrame {
	private JTextField userText;
	private JTextArea chatWindow;
	private ObjectOutputStream output;
	private ObjectInputStream input;
	private ServerSocket server;
	private Socket connection;

	// 构造方法
	public Server() {
		super("Server");
		userText = new JTextField();
		userText.setEditable(false);
		userText.addActionListener(event -> sendMessage(event.getActionCommand()));
		add(userText, BorderLayout.NORTH);

		chatWindow = new JTextArea();
		add(new JScrollPane(chatWindow));

		setSize(300, 150);
		setVisible(true);
	}

	// 启动服务器
	public void startRunning() {
		try {
			server = new ServerSocket(7777, 100);
			while (true) {
				try {
					waitForConnection();
					setupStreams();
					whileChatting();
				} catch (EOFException eofException) {
					showMessage("\nServer ended the connection!");
				} finally {
					closeCrap();
				}
			}
		} catch (IOException ioException) {
			ioException.printStackTrace();
		}
	}

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

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

	// 聊天
	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("\nUnknown object type received!");
			}
		} while (!message.equals("CLIENT - END"));
	}

	// 关闭连接
	private void closeCrap() {
		showMessage("\nClosing connections...\n");
		ableToType(false);
		try {
			output.close();
			input.close();
			connection.close();
		} catch (IOException ioException) {
			ioException.printStackTrace();
		}
	}

	// 发送消息
	private void sendMessage(String message) {
		try {
			output.writeObject("SERVER - " + message);
			output.flush();
			showMessage("\nSERVER - " + message);
		} catch (IOException ioException) {
			chatWindow.append("\nERROR: Cannot send message!");
		}
	}

	// 更新聊天窗口
	private void showMessage(String message) {
		SwingUtilities.invokeLater(() -> chatWindow.append(message));
	}

	// 是否可以输入
	private void ableToType(boolean tof) {
		SwingUtilities.invokeLater(() -> userText.setEditable(tof));
	}
}

2. 客户端代码：

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

public class Client extends JFrame {
	private JTextField userText;
	private JTextArea chatWindow;
	private ObjectOutputStream output;
	private ObjectInputStream input;
	private String message = "";
	private String serverIP;
	private Socket connection;

	// 构造方法
	public Client(String host) {
		super("Client");
		serverIP = host;
		userText = new JTextField();
		userText.setEditable(false);
		userText.addActionListener(event -> sendMessage(event.getActionCommand()));
		add(userText, BorderLayout.NORTH);

		chatWindow = new JTextArea();
		add(new JScrollPane(chatWindow));

		setSize(300, 150);
		setVisible(true);
	}

	// 连接到服务器
	public void startRunning() {
		try {
			connectToServer();
			setupStreams();
			whileChatting();
		} catch (EOFException eofException) {
			showMessage("\nClient terminated the connection!");
		} catch (IOException ioException) {
			ioException.printStackTrace();
		} finally {
			closeCrap();
		}
	}

	// 连接到服务器
	private void connectToServer() throws IOException {
		showMessage("Attempting connection...\n");
		connection = new Socket(InetAddress.getByName(serverIP), 7777);
		showMessage("Connected to: " + connection.getInetAddress().getHostName());
	}

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

	// 聊天
	private void whileChatting() throws IOException {
		ableToType(true);
		do {
			try {
				message = (String) input.readObject();
				showMessage("\n" + message);
			} catch (ClassNotFoundException classNotFoundException) {
				showMessage("\nUnknown object type received!");
			}
		} while (!message.equals("SERVER - END"));
	}

	// 关闭连接
	private void closeCrap() {
		showMessage("\nClosing connections...\n");
		ableToType(false);
		try {
			output.close();
			input.close();
			connection.close();
		} catch (IOException ioException) {
			ioException.printStackTrace();
		}
	}

	// 发送消息
	private void sendMessage(String message) {
		try {
			output.writeObject("CLIENT - " + message);
			output.flush();
			showMessage("\nCLIENT - " + message);
		} catch (IOException ioException) {
			chatWindow.append("\nERROR: Cannot send message!");
		}
	}

	// 更新聊天窗口
	private void showMessage(String message) {
		SwingUtilities.invokeLater(() -> chatWindow.append(message));
	}

	// 是否可以输入
	private void ableToType(boolean tof) {
		SwingUtilities.invokeLater(() -> userText.setEditable(tof));
	}
}

以上就是一个使用 ServerSocket 类和 Socket 类以及 InetAddress 类编写的简单聊天程序的代码。