设计模式 十九实验

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

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；

Java:

package mediator;

//抽象聊天室类，代表抽象中介类

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 image);

}

 

package mediator;

 

//抽象同事类

public abstract class Member {

    protected AbstractChatroom chatroom;

    protected String name;

 

    public Member(String name) {

        this.name = name;

    }

 

    public AbstractChatroom getChatroom() {

        return chatroom;

    }

 

    public void setChatroom(AbstractChatroom chatroom) {

        this.chatroom = chatroom;

    }

 

    public String getName() {

        return name;

    }

 

    public void setName(String name) {

        this.name = name;

    }

 

    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:" + name + ",内容为:" + message);

    }

 

    public void receiveImage(String from, String image) {

        System.out.println(from + "发送图片给:" + name + ",内容:" + image);

    }

}

 

package mediator;

 

import java.util.Hashtable;

 

//具体中介者类，聊天室

public class ChatGroup extends AbstractChatroom{

    private Hashtable members = new Hashtable();

 

    @Override

    public void register(Member member) {

        if(!members.contains(member)){

            members.put(member.getName(),member);

            member.setChatroom(this);

        }

    }

 

    @Override

    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,message);

    }

 

    @Override

    public void sendImage(String from, String to, String image) {

        Member member = (Member) members.get(to);

        if(image.length()>5){

            System.out.println("图片太大，发送失败");

        }else {

            member.receiveImage(from,image);

        }

    }

}

 

package mediator;

 

import java.util.Hashtable;

 

//具体中介者类，新增具体聊天室

public class ChatRoom extends AbstractChatroom{

    private Hashtable members = new Hashtable();

 

    @Override

    public void register(Member member) {

        if(!members.contains(member)){

            members.put(member.getName(),member);

            member.setChatroom(this);

        }

    }

 

    @Override

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

        Member member = (Member) members.get(to);

        if(message.length()>100){

            System.out.println("字符长度超过100，发送失败");

        }else {

            member.receiveText(from,message);

        }

    }

 

    @Override

    public void sendImage(String from, String to, String image) {

        Member member = (Member) members.get(to);

        if(image.length()>200){

            System.out.println("图片超过200M，发送失败");

        }else {

            member.receiveImage(from, image);

        }

    }

}

 

package mediator;

 

public class CommonMember extends Member{

    public CommonMember(String name) {

        super(name);

    }

 

    @Override

    public void sendText(String to, String message) {

        System.out.println("普通会员发送文本消息：");

        chatroom.sendText(name,to,message);

    }

 

    @Override

    public void sendImage(String to, String image) {

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

    }

}

 

package mediator;

 

public class DiamondMember extends Member{

 

    public DiamondMember(String name) {

        super(name);

    }

 

    @Override

    public void sendText(String to, String message) {

        System.out.println("钻石会员发送文本信息：");

        chatroom.sendText(name,to,message);

    }

 

    @Override

    public void sendImage(String to, String image) {

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

        chatroom.sendImage(name,to,image);

    }

}

 

package mediator;

 

import java.util.Scanner;

 

//新增具体会员类，超级会员

public class SuperMember extends Member {

    public SuperMember(String name) {

        super(name);

    }

 

    @Override

    public void sendText(String to, String message) {

        System.out.println("超级会员发送文本:");

        Scanner sc = new Scanner(System.in);

        System.out.print(name + "请输入时间：");

        String time = sc.next();

        message = message + time;

        chatroom.sendText(name, to, message);

    }

 

    @Override

    public void sendImage(String to, String image) {

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

        chatroom.sendImage(name,to,image);

    }

}

 

package mediator;

 

public class Client {

    public static void main(String[] args) {

        AbstractChatroom chatroom = new ChatGroup();

        Member m1,m2,m3,m4,m5;

        m1 = new DiamondMember("张三");

        m2 = new DiamondMember("李四");

        m3 = new CommonMember("王五");

        m4 = new CommonMember("小红");

        m5 = new CommonMember("小芳");

 

        chatroom.register(m1);

        chatroom.register(m2);

        chatroom.register(m3);

        chatroom.register(m4);

        chatroom.register(m5);

 

        m1.sendText("李四","李四，你好");

        m2.sendText("张三","张三，你好");

        m1.sendText("李四","今天天气不错，有日");

        m2.sendImage("张三","太阳图片");

        m3.sendText("小芳","还有问题吗");

        m3.sendText("小红","还有问题吗");

        m4.sendText("王五","没有了，谢谢");

        m5.sendText("王五","我也没有了");

        m5.sendImage("王五","谢谢");

 

        System.out.println("===========================================");

        AbstractChatroom chat = new ChatRoom();

        Member member1,member2;

 

        member1 = new SuperMember("熊大");

        member2 = new SuperMember("熊二");

 

        chat.register(member1);

        chat.register(member2);

 

        member1.sendText("熊二","熊二，给你果子");

        member1.sendImage("熊二","果子图片");

        member1.sendText("熊二","111111111111111111111111111111111111111111111111111111111111" +

                "111111111111111111111111111111111111111111111111111111111111111111111111111111111111" +

                "111111111111111111111111111111111111111111111111111111111111111111111111111111111111");

        member1.sendImage("熊二","111111111111111111111111111111111111111111111111111111111111" +

                "111111111111111111111111111111111111111111111111111111111111111111111111111111111111" +

                "111111111111111111111111111111111111111111111111111111111111111111111111111111111111" +

                "111111111111111111111111111111111111111111111111111111111111111111111111111111111111" +

                "1111111111111111111111111111111111111111111111111111111111111111111111111111111111111" +

                "1111111111111111111111111111111111111111111111111111111111111111111111111111111111111");

        member2.sendText("熊大","熊大，给你栗子");

        member2.sendImage("熊大","栗子图片");

    }

}

 

 

 

 

 

 

c++:

//

// Created by 贾梓钊 on 2022/11/10.

//

#include<iostream>

#include<map>

#include<cstring>

#include<ctime>

#include<sstream>

using namespace std;

string m_replace(string strSrc,const string &oldStr, const string &newStr,int count=-1)

{

    string strRet=strSrc;

    size_t pos = 0;

    int l_count=0;

    if(-1 == count) //替换所有

        count = strRet.size();

    while ((pos = strRet.find(oldStr, pos)) != string::npos)

    {

        strRet.replace(pos, oldStr.size(), newStr);

        if(++l_count >= count) break;

        pos += newStr.size();

    }

    return strRet;

}

class AbstractChatroom;

class Member{

protected:

    AbstractChatroom *chatroom;

    string name;

public:

    Member(string name){

        this->name=name;

    }

    string getName(){

        return name;

    }

    void setName(string name){

        this->name=name;

    }

    AbstractChatroom* getChatroom(){

        return chatroom;

    }

    void setChatroom(AbstractChatroom* chatroom){

        this->chatroom=chatroom;

    }

    virtual void sendText(string to,string message)=0;

    virtual void sendImage(string to,string image)=0;

    void receiveText(string from,string message){

        cout<<from<<"发送文本给"<<this->name<<",内容为"<<message<<endl;

    }

    void receiveImage(string from,string image){

        cout<<from<<"发送图片给"<<this->name<<",图片为"<<image<<endl;

    }

};

 

class AbstractChatroom{

public:

    virtual void registers(Member *member)=0;

    virtual void sendText(string from,string to,string message)=0;

    virtual void sendImage(string from,string to,string image)=0;

};

//具体中介者类，具体聊天室

class ChatGroup:public AbstractChatroom{

private:

    map<string,Member*> members;

    map<string,Member*>::iterator iter;

public:

    void registers(Member* member){

        iter=members.find(member->getName());

        if(iter==members.end()){

            members.insert(map<string,Member*>::value_type(member->getName(),member));

            member->setChatroom(this);

        }

    }

    void sendText(string from,string to,string message){

        Member* member = members.find(to)->second;

        string newMessage=message;

        newMessage= m_replace(message,"日","*");

        member->receiveText(from,newMessage);

    }

    void sendImage(string from,string to,string image){

        Member* member=members.find(to)->second;

        if(image.length()>5){

            cout<<"图片太大，发送失败"<<endl;

        } else{

            member->receiveImage(from,image);

        }

    }

};

//具体中介者类，新增聊天室

class newChat:public AbstractChatroom{

private:

    map<string, Member*> members;

    map<string, Member*>::iterator iter;

public:

    void registers(Member *member) {

        iter=members.find(member->getName());

        if(iter==members.end()) {

            members.insert(map<string, Member*>::value_type(member->getName(),member));

            member->setChatroom(this);

        }

    }

    void sendText(string from, string to, string message) {

        Member *member=members.find(to)->second;

        string newMessage=message;

        if(message.length()>100) {

            cout<<"发送的文字长度不得超过100个字符,发送失败"<<endl;

        }

        else {

            member->receiveText(from, newMessage);

        }

    }

    void sendImage(string from, string to, string image) {

        Member *member=members.find(to)->second;

        if(image.length()>20) {

            cout<<"图片大小不得超过20M，发送失败"<<endl;

        }

        else {

            member->receiveImage(from, image);

        }

    }

};

class CommonMember :public Member{

protected :

    string name;

public:

    CommonMember(string name):Member(name) {

        this->name=name;

    }

    void sendText(string to, string message) {

        cout<<"普通会员发送消息:"<<endl;

        chatroom->sendText(this->name, to, message);

    }

 

    void sendImage(string to, string image) {

        cout<<"普通会员不能发送图片！"<<endl;

    }

 

};

class DiamondMember :public Member{

protected :

    string name;

public:

    DiamondMember(string name):Member(name){

        this->name=name;

    }

    void sendText(string to, string message) {

        cout<<"钻石会员发送消息:"<<endl;

        chatroom->sendText(name,to, message);

    }

    void sendImage(string to, string image) {

        cout<<"钻石会员发送图片:"<<endl;

        chatroom->sendImage(name, to, image);

    }

};

class CrownMember :public Member{

protected :

    string name;

public:

    CrownMember(string name):Member(name){

        this->name=name;

    }

    void sendText(string to, string message) {

        time_t now = time(NULL);

        tm* t = localtime(&now);

        // 将信息输出到字符串流

        stringstream ss;

        stringstream ss2;

        ss << t->tm_year + 1900 << "." << t->tm_mon + 1 << "." <<

           t->tm_mday << ".." << t->tm_hour << "." << t->tm_min << "." << t->tm_sec;

        cout<<"皇冠会员发送消息:"<<endl;

        chatroom->sendText(name,to,message+"  现在时间"+ss.str());

    }

    void sendImage(string to, string image) {

        cout<<"皇冠会员发送图片:"<<endl;

        chatroom->sendImage(name, to, image);

    }

};

int main() {

    AbstractChatroom *newChat=new class newChat();

 

    stringstream ss;//生成100个以上的字符

 

    Member *member1,*member2,*member3,*member4,*member5,*member6;

    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");

    member6=new CrownMember("小明");

 

    newChat->registers(member1);

    newChat->registers(member2);

    newChat->registers(member3);

    newChat->registers(member4);

    newChat->registers(member5);

    newChat->registers(member6);

 

 

    member1->sendText("李四","李四，你好！");

    member2->sendText("张三","张三，你好！");

 

    member3->sendText("小芳","你好小芳!,我是王五");

    member3->sendText("小红","小红，我是王五");

    member4->sendText("王五","你好王五");

    member5->sendText("王五","你好呀王五");

 

    member6->sendText("王五","王五，我是皇冠会员");

 

    for(int i=0;i<110;i++) {

        ss <<"-";

    }

    member6->sendText("王五",ss.str());

    return 0;

}

2. 注意编程规范。

Java

 

 

c++