javaGUI实现多人聊天功能

下面是Java GUI实现多人聊天的完整攻略：

1. 确定实现方式

Java GUI实现多人聊天功能，可以采用Socket连接和Java Swing界面实现，也可以使用第三方库。这里我们介绍Socket连接和Java Swing界面实现的方式。

2. 创建Server端

首先，创建Server端代码，该部分主要用于监听客户端的连接请求，并进行相应的处理。其中，Server使用TCP协议连接，等待客户端连接。以下是Server端的示例代码：

import java.net.*;
import java.io.*;

public class Server {
    private Socket socket;
    private ServerSocket serverSocket;
    private DataInputStream in;
    private DataOutputStream out;

    public Server() {
        try {
            serverSocket = new ServerSocket(8000);
            socket = serverSocket.accept();
            System.out.println("客户端连接成功！");

            in = new DataInputStream(socket.getInputStream());
            out = new DataOutputStream(socket.getOutputStream());

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            String message = "";
            String receiveMessage = "";

            //循环接收消息并回复客户端
            while(!message.equals("end")){
                receiveMessage = in.readUTF();
                System.out.println("客户端：" + receiveMessage);
                message = br.readLine();
                out.writeUTF(message);
                out.flush();
            }

            in.close();
            out.close();
            socket.close();
            serverSocket.close();

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

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

3. 创建Client端

接下来，创建Client端代码，该部分主要用于连接到Server端并进行聊天操作。以下是Client端的示例代码：

import java.net.*;
import java.io.*;

public class Client {
    private Socket socket;
    private DataInputStream in;
    private DataOutputStream out;

    public Client() {
        try {
            socket = new Socket("localhost", 8000);
            System.out.println("连接服务器成功！");

            in = new DataInputStream(socket.getInputStream());
            out = new DataOutputStream(socket.getOutputStream());

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            String message = "";
            String receiveMessage = "";

            //循环发送消息并接收服务器回复
            while(!message.equals("end")){
                message = br.readLine();
                out.writeUTF(message);
                out.flush();

                receiveMessage = in.readUTF();
                System.out.println("Server:" + receiveMessage);
            }

            in.close();
            out.close();
            socket.close();

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

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

4. 创建GUI界面

最后，我们创建一个GUI界面，用于实现多人聊天的界面操作。以下是实现多人聊天的示例代码：

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

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

public class ChatClient {

    private JFrame frame;
    private JTextField textField;
    private JTextArea textArea;
    private Socket socket;
    private DataInputStream in;
    private DataOutputStream out;

    public ChatClient() {
        initialize();
        connect();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.getContentPane().add(panel, BorderLayout.SOUTH);

        textField = new JTextField();
        panel.add(textField);
        textField.setColumns(30);

        JButton btnNewButton = new JButton("发送");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String message = textField.getText();
                try {
                    out.writeUTF(message);
                    out.flush();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }

                textField.setText("");
            }
        });
        panel.add(btnNewButton);

        JPanel panel_1 = new JPanel();
        frame.getContentPane().add(panel_1, BorderLayout.CENTER);
        panel_1.setLayout(new BorderLayout(0, 0));

        JScrollPane scrollPane = new JScrollPane();
        panel_1.add(scrollPane, BorderLayout.CENTER);

        textArea = new JTextArea();
        scrollPane.setViewportView(textArea);
    }

    /**
     * 连接服务器
     */
    private void connect() {
        try {
            socket = new Socket("localhost", 8000);
            System.out.println("连接服务器成功！");

            //初始化输入输出流
            in = new DataInputStream(socket.getInputStream());
            out = new DataOutputStream(socket.getOutputStream());

            //读取服务器信息
            new Thread(new Runnable() {

                @Override
                public void run() {
                    String message = "";
                    while (true) {
                        try {
                            message = in.readUTF();
                            textArea.append(message + "\n");
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }).start();

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

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ChatClient window = new ChatClient();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

总结

以上就是实现Java GUI多人聊天的完整攻略。其中，我们首先确定了实现方式，并编写了Server和Client端的代码；接着，我们创建了一个简单的GUI界面，用于实现多人聊天功能。该程序可以扩展为多人聊天室、群聊等更为复杂的场景。