中介者模式实例与解析----实例：虚拟聊天室

某论坛系统欲增加一个虚拟聊天室，允许论坛会员通过该聊天室进行信息交流，普通会员(CommonMember)可以给其他会员发送文本信息，钻石会员(DiamondMember)既可以给其他会员发送文本信息，还可以发送图片信息。该聊天室可以对不雅字符进行过滤，如“日”等字符；还可以对发送的图片大小进行控制。用中介者模式设计该虚拟聊天室。

public abstract class AbstractChatroom
{public abstract void register(Member member);public abstract void sendText(String from,String to,String message);public abstract void sendImage(String from,String to,String message);
}

import java.util.*;public class ChatGroup extends AbstractChatroom
{private Hashtable members=new Hashtable();public void register(Member member){if(!members.contains(member)){members.put(member.getName(),member);member.setChatroom(this);}}public void sendText(String from,String to,String message){Member member=(Member)members.get(to);String newMessage=message;newMessage=message.replaceAll("日","*");member.receiveText(from,newMessage);}public void sendImage(String from,String to,String image){Member member=(Member)members.get(to);//模拟图片大小判断if(image.length()>5){System.out.println("图片太大，发送失败！");}else{member.receiveImage(from,image);}}
}

public class Client
{public static void main(String args[]){AbstractChatroom happyChat=new ChatGroup();Member member1,member2,member3,member4,member5;member1=new DiamondMember("张三");member2=new DiamondMember("李四");member3=new CommonMember("王五");member4=new CommonMember("小芳");member5=new CommonMember("小红");happyChat.register(member1);happyChat.register(member2);happyChat.register(member3);happyChat.register(member4);happyChat.register(member5);member1.sendText("李四","李四，你好！");member2.sendText("张三","张三，你好！");member1.sendText("李四","今天天气不错，有日！");member2.sendImage("张三","一个很大很大的太阳");member2.sendImage("张三","太阳");member3.sendText("小芳","还有问题吗？");member3.sendText("小红","还有问题吗？");member4.sendText("王五","没有了，谢谢！");member5.sendText("王五","我也没有了！");member5.sendImage("王五","谢谢");}
}

public class CommonMember extends Member
{public CommonMember(String name){super(name);}public void sendText(String to,String message){System.out.println("普通会员发送信息：");chatroom.sendText(name,to,message);  //发送}public void sendImage(String to,String image){System.out.println("普通会员不能发送图片！");}
}

public class DiamondMember extends Member
{public DiamondMember(String name){super(name);}public void sendText(String to,String message){System.out.println("钻石会员发送信息：");chatroom.sendText(name,to,message);  //发送}public void sendImage(String to,String image){System.out.println("钻石会员发送图片：");chatroom.sendImage(name,to,image);  //发送}
}

public abstract class Member
{protected AbstractChatroom chatroom;protected String name;public Member(String name){this.name=name;}public String getName(){return name;}public void setName(String name){this.name=name;}public AbstractChatroom getChatroom(){return chatroom;}public void setChatroom(AbstractChatroom chatroom){this.chatroom=chatroom;}public abstract void sendText(String to,String message);public abstract void sendImage(String to,String image);public void receiveText(String from,String message){System.out.println(from + "发送文本给" + this.name + "，内容为：" + message);}public void receiveImage(String from,String image){System.out.println(from + "发送图片给" + this.name + "，内容为：" + image);}	
}

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