实验十九

[实验任务一]：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；

2. 注意编程规范。

 

AbstractChatRoom.java

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

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);

        }

    }

}

Client.java

public class Client {

     public static void main(String args[]){

            AbstractChatroom r1=new NewGroup();

            Member m1,m2,m3;

            m1=new NewMember("adam");

            m2=new NewMember("gyh");

            m3=new NewMember("dyx");

            r1.register(m1);

            r1.register(m2);

            r1.register(m3);

            m1.sendtext("gyh","：Hello world");

            m2.sendtext("adam","：hi");

            m1.sendtext("adam","：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");

            m3.sendimage("adam","：hello_world.jpg");

            m2.sendimage("dyx","：你好世界.jpg--------------------");

        }

}

CommonMember.java

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");

    }

}

Member.java

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

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

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);

    }

}

VIPMember.java

public class VIPMember extends Member{

    public VIPMember(String a){

        super(a);

    }

    public void sendtext(String a,String c){

        System.out.println("VIP用户发送消息");

        room.sendtext(name,a,c);

    }

    public void sendimage(String a,String c){

        System.out.println("VIP用户发送图片");

        room.sendimage(name,a,c);

    }

}