中介者模式

虚拟聊天室

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；

AbstractChatroom.java

package ruanshe19;

 

public abstract class AbstractChatroom {

    public abstract void register(Member m);

    public abstract void sendtext(String a,String b,String mess);

    public abstract void sendimage(String a,String b,String mess);

}

ChatGroup.java

package ruanshe19;

 

import java.util.*;

 

public class ChatGroup extends AbstractChatroom{

    private Hashtable ms=new Hashtable();

    public void register(Member m)

    {

        if(!ms.contains(m)){

            ms.put(m.getname(),m);

            m.setroom(this);

        }

    }

    public void sendtext(String a,String b,String c){

        Member m=(Member)ms.get(b);

        String newm=c;

        newm=c.replaceAll("日","*");

        m.receivetext(a,newm);

    }

    public void sendimage(String a,String b,String c){

        Member m=(Member)ms.get(b);

        if(c.length()>5){

            System.out.println("图片较大，发送失败");

        }else{

            m.receiveimage(a,c);

        }

    }

}

CommonMember.java

package ruanshe19;

 

public class CommonMember extends Member{

    public CommonMember(String a){

        super(a);

    }

    public void sendtext(String a,String c){

        System.out.println("普通会员发送消息");

        room.sendtext(name,a,c);

    }

    public void sendimage(String a,String c){

        System.out.println("普通会员不能发送图片");

    }

}

DiamondMember.java

package ruanshe19;

 

public class DiamondMember extends Member{

    public DiamondMember(String a){

              super(a);

           }

    public void sendtext(String a,String c){

               System.out.println("钻石会员发送消息");

               room.sendtext(name,a,c);

            }

    public void sendimage(String a,String c){

             System.out.println("钻石会员发送图片");

             room.sendimage(name,a,c);

          }

}

main.java

package ruanshe19;

 

public class main {

    public static void main(String args[]){

        AbstractChatroom r1=new NewGroup();

        Member m1,m2,m3;

        m1=new NewMember("小1");

        m2=new NewMember("小2");

        m3=new NewMember("小6");

        r1.register(m1);

        r1.register(m2);

        r1.register(m3);

        m1.sendtext("小1","：小1，你好");

        m2.sendtext("小2","：小2，你好");

        m1.sendtext("小1","：你在家吗？");

        m2.sendtext("小2","：在");

        m1.sendtext("小6","：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");

        m3.sendimage("小2","：123.jpg");

        m2.sendimage("小6","：456.jpg--------------------");

    }

}

Member.java

package ruanshe19;

 

public abstract class Member {

    protected AbstractChatroom room;

    protected String name;

    public Member(String a){

        name=a;

    }

    public String getname(){

        return name;

    }

    public void setname(String a){

        name=a;

    }

    public AbstractChatroom getroom(){

        return room;

    }

    public void setroom(AbstractChatroom a){

        room=a;

    }

    public abstract void sendtext(String a,String mess);

    public abstract void sendimage(String a,String image);

    public void receivetext(String a,String mess){

        System.out.println(a+"发送的给"+name+"内容是"+mess);

    }

    public void receiveimage(String a,String image){

        System.out.println(a+"发送的给"+name+"内容是"+image);

    }

}

NewGroup.java

package ruanshe19;

 

import java.util.HashMap;

import java.util.Map;

public class NewGroup extends AbstractChatroom{

 

    Map<String,Member> table = new HashMap<>();

    public void register(Member member) {

        table.put(member.getname(), member);

        member.setroom(this);

    }

 

    public void sendtext(String from, String to, String message) {

        if(message.length()>=100){

            System.out.println("超过100个字符，发送失败");

        }else{

            Member member = table.get(to);

            if(member!=null)

                member.receivetext(from, message);

        }

    }

 

    public void sendimage(String from, String to, String message) {

        if(message.length()>=20){

            System.out.println("图片超过20M，发送失败");

        }else{

            Member member = table.get(to);

            if(member!=null)

                member.receiveimage(from, message);

        }

    }

 

}

NewMember.java

package ruanshe19;

 

public class NewMember extends Member{

    public NewMember(String a){

        super(a);

    }

    public void sendtext(String a,String c){

        System.out.println("新会员发送消息：");

        room.sendtext(name,a,c);

    }

    public void sendimage(String a,String c){

        System.out.println("新会员发送图片：");

        room.sendimage(name,a,c);

    }

}