11月24日

在“虚拟聊天室”实例中增加一个新的具体聊天室类和一个新的具体会员类，要求如下：

1. 新的具体聊天室中发送的图片大小不得超过20M。

2. 新的具体聊天室中发送的文字长度不得超过100个字符。

3. 新的具体会员类可以发送图片信息和文本信息。

4. 新的具体会员类在发送文本信息时，可以在信息后加上时间。

修改客户端测试类，注意原有系统类代码和客户端代码的修改。

实验要求：

1. 提交源代码；

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

 

class NewChatRoom {

    private ArrayList<String> messages = new ArrayList<>();

    private JTextArea chatArea;

 

    public NewChatRoom(JTextArea chatArea) {

        this.chatArea = chatArea;

    }

 

    public void sendTextMessage(NewMember member, String text) {

        if (text.length() <= 100) {

            String message = member.getName() + ": " + text;

            messages.add(message);

            displayMessage(message);

        } else {

            System.out.println("Text message exceeds 100 characters. Not sent.");

        }

    }

 

    public void sendImage(NewMember member, int imageSize) {

        if (imageSize <= 20) {

            String message = member.getName() + " sent an image.";

            messages.add(message);

            displayMessage(message);

        } else {

            System.out.println("Image size exceeds 20M. Not sent.");

        }

    }

 

    private void displayMessage(String message) {

        chatArea.append(message + "\n");

    }

}

 

class NewMember {

    private String name;

 

    public NewMember(String name) {

        this.name = name;

    }

 

    public String getName() {

        return name;

    }

 

    public void sendTextMessage(NewChatRoom chatRoom, String text) {

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        String currentTime = dateFormat.format(new Date());

 

        String formattedText = text + " - " + currentTime;

        chatRoom.sendTextMessage(this, formattedText);

    }

 

    public void sendImage(NewChatRoom chatRoom, int imageSize) {

        chatRoom.sendImage(this, imageSize);

    }

}

 

public class ChatGUI extends JFrame {

    private NewChatRoom chatRoom;

    private JTextField messageField;

 

    public ChatGUI() {

        setTitle("Simple Chat Room");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new BorderLayout());

 

        JTextArea chatArea = new JTextArea();

        chatArea.setEditable(false);

        JScrollPane scrollPane = new JScrollPane(chatArea);

        add(scrollPane, BorderLayout.CENTER);

 

        JPanel bottomPanel = new JPanel();

        bottomPanel.setLayout(new BorderLayout());

 

        messageField = new JTextField();

        bottomPanel.add(messageField, BorderLayout.CENTER);

 

        JButton sendButton = new JButton("Send");

        sendButton.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                sendMessage();

            }

        });

        bottomPanel.add(sendButton, BorderLayout.EAST);

 

        add(bottomPanel, BorderLayout.SOUTH);

 

        chatRoom = new NewChatRoom(chatArea);

 

        setSize(400, 300);

        setVisible(true);

    }

 

    private void sendMessage() {

        String message = messageField.getText().trim();

        if (!message.isEmpty()) {

            NewMember member = new NewMember("User");

            member.sendTextMessage(chatRoom, message);

            messageField.setText("");

        }

    }

 

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {

            @Override

            public void run() {

                new ChatGUI();

            }

        });

    }

}