写代码利用Java的Socket通信，实现一款即时通信软件，能够允许任意多的客户端的参与，客户端需要图形界面。

好的，以下是Java Socket通信实现即时通信软件的代码示例：

服务器端代码：

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

public class Server {
    // 定义服务器端口号
    public static final int PORT = 8888;
    // 定义客户端列表
    private List<ClientHandler> clients = new ArrayList<>();

    public void start() {
        try {
            // 创建服务器Socket
            ServerSocket serverSocket = new ServerSocket(PORT);
            System.out.println("服务器已启动，等待客户端连接...");
            // 循环等待客户端连接
            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("客户端已连接：" + socket.getInetAddress().getHostAddress());
                // 创建客户端处理线程
                ClientHandler handler = new ClientHandler(socket);
                // 添加客户端到列表
                clients.add(handler);
                // 启动客户端处理线程
                handler.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 广播消息给所有客户端
    public synchronized void broadcast(String message) {
        for (ClientHandler handler : clients) {
            handler.send(message);
        }
    }

    // 客户端处理线程类
    class ClientHandler extends Thread {
        private Socket socket;
        private BufferedReader reader;
        private BufferedWriter writer;

        public ClientHandler(Socket socket) {
            this.socket = socket;
            try {
                // 创建输入输出流
                reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        // 发送消息给客户端
        public void send(String message) {
            try {
                writer.write(message + "\n");
                writer.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        // 接收客户端消息
        public void run() {
            try {
                while (true) {
                    String message = reader.readLine();
                    if (message == null) {
                        // 客户端断开连接
                        System.out.println("客户端已断开：" + socket.getInetAddress().getHostAddress());
                        // 从列表中移除客户端
                        clients.remove(this);
                        // 关闭输入输出流和Socket
                        reader.close();
                        writer.close();
                        socket.close();
                        break;
                    } else {
                        // 广播消息给所有客户端
                        broadcast(message);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

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

客户端代码：

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

public class Client extends JFrame {
    // 定义服务器IP地址和端口号
    public static final String SERVER_HOST = "localhost";
    public static final int SERVER_PORT = 8888;
    // 定义客户端Socket
    private Socket socket;
    // 定义输入输出流
    private BufferedReader reader;
    private BufferedWriter writer;
    // 定义GUI组件
    private JTextArea messageArea;
    private JTextField inputField;

    public Client() {
        // 创建GUI组件
        messageArea = new JTextArea();
        messageArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(messageArea);
        inputField = new JTextField();
        JButton sendButton = new JButton("发送");
        // 添加事件监听器
        sendButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String message = inputField.getText().trim();
                if (!message.isEmpty()) {
                    // 发送消息给服务器
                    try {
                        writer.write(message + "\n");
                        writer.flush();
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }
                    inputField.setText("");
                }
            }
        });
        inputField.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                sendButton.doClick();
            }
        });
        // 添加GUI组件到窗口
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(scrollPane, BorderLayout.CENTER);
        panel.add(inputField, BorderLayout.SOUTH);
        panel.add(sendButton, BorderLayout.EAST);
        setContentPane(panel);
        setTitle("即时通信软件");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);
        setLocationRelativeTo(null);
        setVisible(true);
        // 连接服务器
        try {
            socket = new Socket(SERVER_HOST, SERVER_PORT);
            reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
            // 启动消息接收线程
            new MessageReceiver().start();
        } catch (IOException e) {
            e.printStackTrace();
            JOptionPane.showMessageDialog(this, "无法连接到服务器", "错误", JOptionPane.ERROR_MESSAGE);
            System.exit(0);
        }
    }

    // 消息接收线程类
    class MessageReceiver extends Thread {
        public void run() {
            try {
                while (true) {
                    String message = reader.readLine();
                    if (message == null) {
                        // 服务器断开连接
                        JOptionPane.showMessageDialog(Client.this, "服务器已断开连接", "错误", JOptionPane.ERROR_MESSAGE);
                        System.exit(0);
                    } else {
                        // 收到消息更新GUI组件
                        messageArea.append(message + "\n");
                        messageArea.setCaretPosition(messageArea.getDocument().getLength());
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

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

以上是基于Java Socket通信实现即时通信软件的代码示例，希望能对您有所帮助。