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++
