中介者模式

软件设计                  石家庄铁道大学信息学院

 

实验19:中介者模式

本次实验属于模仿型实验,通过本次实验学生将掌握以下内容: 

1、理解中介者模式的动机,掌握该模式的结构;

2、能够利用中介者模式解决实际问题。

 

[实验任务一]:虚拟聊天室

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;

package Intermediary_model;

 

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);

}

 

package Intermediary_model;

 

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("","*");

        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);

        }

    }

}

package Intermediary_model;

 

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");

    }

}

package Intermediary_model;

 

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);

           }

 }

package Intermediary_model;

 

public class main {

    public static void main(String args[]){

        AbstractChatroom r1=new NewGroup();

        Member m1,m2,m3;

        m1=new NewMember("小张");

        m2=new NewMember("");

        m3=new NewMember("");

        r1.register(m1);

        r1.register(m2);

        r1.register(m3);

        m1.sendtext("小张",":小张,你好");

        m2.sendtext("小王","小王,你好");

        m1.sendtext("小张",":你在家吗?");

        m2.sendtext("小王",":在");

        m1.sendtext("小李","---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");

        m3.sendimage("小王","你好.jpg");

        m2.sendimage("小李","你好.jpg--------------------");

    }

}

package Intermediary_model;

 

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);

    }

}

package Intermediary_model;

 

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);

        }

    }

 

}

package Intermediary_model;

 

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);

    }

}

2. 注意编程规范。

 

 

posted @ 2023-11-08 16:27  旺旺大菠萝  阅读(3)  评论(0编辑  收藏  举报