11.29（1）

补11.28
1.类图
┌─────────────────┐
│ AbstractChatRoom │
├─────────────────┤
│ +register() │
│ +sendText() │
│ +sendImage() │
└─────────────────┘
△
│
┌───────────┐
│CommonChatRoom│
│StrictChatRoom│
└───────────┘
△
│
┌─────────────────┐
│ Member │
├─────────────────┤
│ +sendText() │
│ +sendImage() │
└─────────────────┘
△
│
┌───────────┐
│ DiamondMember │
└───────────┘
2.源代码
import java.text.SimpleDateFormat;
import java.util.*;

/**

• 虚拟聊天室系统 - 中介者模式实现
• 包含普通聊天室、严格聊天室、普通会员和钻石会员
  */

// 抽象中介者 - 聊天室
abstract class AbstractChatRoom {
protected Map<String, Member> members = new HashMap<>();

// 注册会员
public void register(Member member) {
    if (!members.containsKey(member.getName())) {
        members.put(member.getName(), member);
        member.setChatRoom(this);
        System.out.println("【系统】" + member.getName() + " 加入聊天室");
    }
}

// 发送文本消息
public abstract void sendText(String from, String to, String message);

// 发送图片消息
public abstract void sendImage(String from, String to, String imageName, int imageSize);

// 广播文本消息
public abstract void broadcastText(String from, String message);

// 广播图片消息
public abstract void broadcastImage(String from, String imageName, int imageSize);

// 获取在线会员列表
public List<String> getOnlineMembers() {
    return new ArrayList<>(members.keySet());
}

}

// 普通聊天室
class CommonChatRoom extends AbstractChatRoom {
@Override
public void sendText(String from, String to, String message) {
Member member = members.get(to);
if (member != null) {
System.out.println("【私聊】" + from + " -> " + to + ": " + message);
member.receiveText(from, message);
} else {
System.out.println("【系统】用户 " + to + " 不存在！");
}
}

@Override
public void sendImage(String from, String to, String imageName, int imageSize) {
    Member member = members.get(to);
    if (member != null) {
        System.out.println("【图片】" + from + " -> " + to + ": " + imageName + " (" + imageSize + "M)");
        member.receiveImage(from, imageName, imageSize);
    } else {
        System.out.println("【系统】用户 " + to + " 不存在！");
    }
}

@Override
public void broadcastText(String from, String message) {
    System.out.println("【广播】" + from + ": " + message);
    for (Member member : members.values()) {
        if (!member.getName().equals(from)) {
            member.receiveText(from, message);
        }
    }
}

@Override
public void broadcastImage(String from, String imageName, int imageSize) {
    System.out.println("【广播图片】" + from + ": " + imageName + " (" + imageSize + "M)");
    for (Member member : members.values()) {
        if (!member.getName().equals(from)) {
            member.receiveImage(from, imageName, imageSize);
        }
    }
}

}

// 严格聊天室 - 新的具体聊天室类
class StrictChatRoom extends AbstractChatRoom {
private static final int MAX_IMAGE_SIZE = 20; // 图片大小限制20M
private static final int MAX_TEXT_LENGTH = 100; // 文本长度限制100字符

@Override
public void sendText(String from, String to, String message) {
    // 检查文本长度
    if (message.length() > MAX_TEXT_LENGTH) {
        System.out.println("【系统错误】文本长度不能超过 " + MAX_TEXT_LENGTH + " 个字符");
        return;
    }
    
    Member member = members.get(to);
    if (member != null) {
        System.out.println("【严格私聊】" + from + " -> " + to + ": " + message);
        member.receiveText(from, message);
    } else {
        System.out.println("【系统】用户 " + to + " 不存在！");
    }
}

@Override
public void sendImage(String from, String to, String imageName, int imageSize) {
    // 检查图片大小
    if (imageSize > MAX_IMAGE_SIZE) {
        System.out.println("【系统错误】图片大小不能超过 " + MAX_IMAGE_SIZE + "M");
        return;
    }
    
    Member member = members.get(to);
    if (member != null) {
        System.out.println("【严格图片】" + from + " -> " + to + ": " + imageName + " (" + imageSize + "M)");
        member.receiveImage(from, imageName, imageSize);
    } else {
        System.out.println("【系统】用户 " + to + " 不存在！");
    }
}

@Override
public void broadcastText(String from, String message) {
    // 检查文本长度
    if (message.length() > MAX_TEXT_LENGTH) {
        System.out.println("【系统错误】文本长度不能超过 " + MAX_TEXT_LENGTH + " 个字符");
        return;
    }
    
    System.out.println("【严格广播】" + from + ": " + message);
    for (Member member : members.values()) {
        if (!member.getName().equals(from)) {
            member.receiveText(from, message);
        }
    }
}

@Override
public void broadcastImage(String from, String imageName, int imageSize) {
    // 检查图片大小
    if (imageSize > MAX_IMAGE_SIZE) {
        System.out.println("【系统错误】图片大小不能超过 " + MAX_IMAGE_SIZE + "M");
        return;
    }
    
    System.out.println("【严格广播图片】" + from + ": " + imageName + " (" + imageSize + "M)");
    for (Member member : members.values()) {
        if (!member.getName().equals(from)) {
            member.receiveImage(from, imageName, imageSize);
        }
    }
}

}

// 抽象同事类 - 会员
abstract class Member {
protected String name;
protected AbstractChatRoom chatRoom;

public Member(String name) {
    this.name = name;
}

public String getName() {
    return name;
}

public void setChatRoom(AbstractChatRoom chatRoom) {
    this.chatRoom = chatRoom;
}

// 发送文本消息
public abstract void sendText(String to, String message);

// 发送图片消息
public abstract void sendImage(String to, String imageName, int imageSize);

// 接收文本消息
public abstract void receiveText(String from, String message);

// 接收图片消息
public abstract void receiveImage(String from, String imageName, int imageSize);

// 广播文本消息
public void broadcastText(String message) {
    if (chatRoom != null) {
        chatRoom.broadcastText(name, message);
    }
}

// 广播图片消息
public void broadcastImage(String imageName, int imageSize) {
    if (chatRoom != null) {
        chatRoom.broadcastImage(name, imageName, imageSize);
    }
}

}

// 普通会员
class CommonMember extends Member {
public CommonMember(String name) {
super(name);
}

@Override
public void sendText(String to, String message) {
    if (chatRoom != null) {
        chatRoom.sendText(name, to, message);
    }
}

@Override
public void sendImage(String to, String imageName, int imageSize) {
    if (chatRoom != null) {
        chatRoom.sendImage(name, to, imageName, imageSize);
    }
}

@Override
public void receiveText(String from, String message) {
    System.out.println("【接收】" + name + " 收到来自 " + from + " 的消息: " + message);
}

@Override
public void receiveImage(String from, String imageName, int imageSize) {
    System.out.println("【接收图片】" + name + " 收到来自 " + from + " 的图片: " + imageName + " (" + imageSize + "M)");
}

}

// 钻石会员 - 新的具体会员类
class DiamondMember extends Member {
private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

public DiamondMember(String name) {
    super(name);
}

@Override
public void sendText(String to, String message) {
    if (chatRoom != null) {
        // 在信息后加上时间
        String messageWithTime = message + " [发送时间: " + dateFormat.format(new Date()) + "]";
        chatRoom.sendText(name, to, messageWithTime);
    }
}

@Override
public void sendImage(String to, String imageName, int imageSize) {
    if (chatRoom != null) {
        chatRoom.sendImage(name, to, imageName, imageSize);
    }
}

@Override
public void receiveText(String from, String message) {
    System.out.println("【钻石接收】" + name + " 收到来自 " + from + " 的消息: " + message);
}

@Override
public void receiveImage(String from, String imageName, int imageSize) {
    System.out.println("【钻石接收图片】" + name + " 收到来自 " + from + " 的图片: " + imageName + " (" + imageSize + "M) [接收时间: " + dateFormat.format(new Date()) + "]");
}

// 钻石会员特有方法 - 发送带时间的广播
public void broadcastTextWithTime(String message) {
    String messageWithTime = message + " [广播时间: " + dateFormat.format(new Date()) + "]";
    broadcastText(messageWithTime);
}

}

// 客户端测试类
public class ChatRoomSystem {
public static void main(String[] args) {
System.out.println("=== 虚拟聊天室系统测试 ===\n");

    // 创建聊天室
    AbstractChatRoom commonRoom = new CommonChatRoom();
    AbstractChatRoom strictRoom = new StrictChatRoom();
    
    // 创建会员
    Member member1 = new CommonMember("张三");
    Member member2 = new CommonMember("李四");
    Member member3 = new DiamondMember("王五");
    Member member4 = new DiamondMember("赵六");
    
    System.out.println("\n=== 测试普通聊天室 ===");
    // 注册到普通聊天室
    commonRoom.register(member1);
    commonRoom.register(member2);
    commonRoom.register(member3);
    
    // 测试普通聊天室功能
    member1.sendText("李四", "你好，李四！这是一条普通消息。");
    member2.sendImage("张三", "风景.jpg", 15);
    member3.broadcastText("大家好，我是钻石会员王五！");
    
    System.out.println("\n=== 测试严格聊天室 ===");
    // 注册到严格聊天室
    strictRoom.register(member3);
    strictRoom.register(member4);
    
    // 测试严格聊天室限制功能
    member3.sendText("赵六", "这是一条正常长度的文本消息。");
    member4.sendText("王五", "这是一条非常长的文本消息，这条消息的长度已经超过了100个字符的限制，应该会被系统拒绝发送。这条消息确实太长了！");
    
    member3.sendImage("赵六", "小图片.png", 10);
    member4.sendImage("王五", "大图片.jpg", 25);
    
    System.out.println("\n=== 测试钻石会员特色功能 ===");
    // 测试钻石会员的时间戳功能
    DiamondMember diamondMember = (DiamondMember) member3;
    diamondMember.sendText("赵六", "这是带时间戳的私聊消息");
    diamondMember.broadcastTextWithTime("这是带时间戳的广播消息");
    
    System.out.println("\n=== 测试在线会员列表 ===");
    System.out.println("普通聊天室在线会员: " + commonRoom.getOnlineMembers());
    System.out.println("严格聊天室在线会员: " + strictRoom.getOnlineMembers());
    
    System.out.println("\n=== 测试完成 ===");
}