问题描述：
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。
C++源代码：
#include<iostream>
#include<map>
#include<ctime>
#include<sstream>
using namespace std;
class AbstractChatroom;
//抽象同事类
class Member {
protected :
AbstractChatroom *chatroom;
string name;
public:
Member(string name) {
this->name=name;
}
AbstractChatroom* getChatroom() {
return chatroom;
}
void setChatroom(AbstractChatroom *chatroom) {
this->chatroom = chatroom;
}
string getName() {
return name;
}
void setName(string name) {
this->name = name;
}
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<<"，内容为："<<image<<endl;
}
};
string 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;
}
//抽象中介者类
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
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=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
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;
newMessage=replace(message,"日", "*");
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);
}
}
};
//具体同事类
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;
}
};
//具体同事类
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);
}
};
//具体同事类
class NewMember :public Member{
protected :
string name;
public:
NewMember(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<<"新会员发送消息:"<<endl;
chatroom->sendText(name,to,message+" 现在时间"+ss.str());
}
void sendImage(string to, string image) {
cout<<"会员发送图片:"<<endl;
chatroom->sendImage(name, to, image);
}
};
//测试函数
int main(){
AbstractChatroom *newChat=new NewChat();
Member *member1,*member2,*member3,*member4;
member1=new DiamondMember("张三");
member2=new CommonMember("小李");
member3=new NewMember("小芳");
member4=new NewMember("小红");
newChat->registers(member1);
newChat->registers(member2);
newChat->registers(member3);
newChat->registers(member4);
member1->sendText("小李","小李，你好！");
member2->sendText("张三","张三，你好！");
cout<<"---------------------------------------------"<<endl;
member3->sendText("小红","小红你好。");
member3->sendText("小红","你好小红!-----------------------------------------------------------------------------------------------------");
member3->sendImage("小红","哈哈.jpg");
member4->sendText("小芳","你好，小芳");
member4->sendImage("小芳","哈哈.jpg--------------------");
}
运行结果：
