19.中介者模式

[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。

代码

java

AbstractChartroom.java

package test19;

public abstract class AbstractChartroom {

    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);

}

Client.java

package test19;

public class Client {

    public static void main(String[] args) {
        AbstractChartroom happyChat = new NewChatGroup();

        Member member1,member2,member3,member4;
        member1 = new NewMember("张三");
        member2 = new NewMember("李四");
        member3 = new NewMember("王五");
        member4 = new NewMember("小芳");

        happyChat.register(member1);
        happyChat.register(member2);
        happyChat.register(member3);
        happyChat.register(member4);

        member1.sendImage("王五","lll");
        member1.sendText("王五","pppp");
        member3.sendText("小芳","dddd");
        member3.sendImage("小芳","oooo");
    }

}

Member.java

package test19;

public abstract class Member {

    protected AbstractChartroom chartroom;
    protected String name;

    public Member(String name){
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public AbstractChartroom getChartroom() {
        return chartroom;
    }

    public void setChartroom(AbstractChartroom chartroom) {
        this.chartroom = chartroom;
    }

    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);
    }
}

NewChatGroup.java

package test19;

import java.util.Date;
import java.util.Hashtable;

public class NewChatGroup extends AbstractChartroom{

    Hashtable members = new Hashtable();

    @Override
    public void register(Member member) {
        if(!members.contains(member)){
            members.put(member.getName(),member);
            member.setChartroom(this);
        }
    }

    @Override
    public void sendText(String from, String to, String message) {
        Member o = (Member)members.get(to);
        if(message.length()>100){
            System.out.println("文字长度不能超过100个字符");
        }else {
            System.out.println(from+"发消息给"+to+"内容为："+message+"时间为："+new Date());
        }
    }

    @Override
    public void sendImage(String from, String to, String image) {
        Member o = (Member)members.get(to);
        if(image.length()>20){
            System.out.println("文字长度不能超过100个字符");
        }else {
            System.out.println(from+"发图片给"+to+"内容为："+image);
        }
    }
}

NewMember.java

package test19;

public class NewMember extends Member{

    public NewMember(String name) {
        super(name);
    }

    @Override
    public void sendText(String to, String message) {
        System.out.println("会员发送消息");
        chartroom.sendText(name,to,message);
    }

    @Override
    public void sendImage(String to, String image) {
        System.out.println("会员发送图片");
        chartroom.sendImage(name,to,image);
    }
}

C++

#include <iostream>
#include <unordered_map>
using namespace std;

class AbstractChatroom;
class Member{
public:
    AbstractChatroom *chatroom;
    string name;
    Member(string name){
        this->name = name;
    }
    string getName(){return this->name;}
    void setName(string name){ this->name = name;}
    AbstractChatroom *getChatroom(){return this->chatroom;}
    void setChatroom(AbstractChatroom* chatroom){ this->chatroom = chatroom;}
    virtual void sendText(string to,string message){}
    virtual void sendImage(string to,string image){}
    void receiveText(string from,string message){
        cout<<from+"给"+name+"发送消息："+message<<endl;
    }
    void receiveImage(string from,string image){
        cout<<from+"给"+name+"发送图片："+image<<endl;
    }
};
class AbstractChatroom{
public:
    virtual void login(Member* member){}
    virtual void sendText(string from,string to,string message){}
    virtual void sendImage(string from,string to,string image){}
};
class NewGroup: public AbstractChatroom{
private:
    unordered_map<string,Member*> members;
public:
    void login(Member *member) override{
        if(members[member->name]==NULL){
            members[member->name] = member;
            cout<<member->name<<"已经注册"<<endl;
        }
        member->setChatroom(this);
        cout<<member->name<<"已经登录"<<endl;
    }
    void sendText(string from,string to,string message){
        if (message.length()<100){
            Member* m = members[to];
            m->receiveText(from,message+"当前时间");
        } else{
            cout<<"发送失败，文字长度不得超过100"<<endl;
        }
    }
    void sendImage(string from,string to,string image){
        if(image.length()<20){
            Member* m = members[to];
            m->receiveImage(from,image);
        }else{
            cout<<"发送失败，图片不得超过20M"<<endl;
        }
    }
};
class NewMember: public Member{
public:
    NewMember(string name):Member(name){

    }
    void sendText(string to,string message){
        chatroom->sendText(name,to,message);
    }
    void sendImage(string to,string image){
        chatroom->sendImage(name,to,image);
    }
};

int main(){
    AbstractChatroom* chatroom = new NewGroup();
    Member *m1,*m2,*m3,*m4;
    m1 = new NewMember("张三");
    m2 = new NewMember("李四");
    m3 = new NewMember("王五");
    m4 = new NewMember("小芳");

    chatroom->login(m1);
    chatroom->login(m2);
    chatroom->login(m3);
    chatroom->login(m4);

    m1->sendImage("王五","lll");
    m1->sendText("王五","pppp");
    m3->sendText("小芳","dddd");
    m3->sendImage("小芳","oooo");

    return 0;
}