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 rjsj.no19;
public class DiamondMember extends Member{
public
DiamondMember(String name) {
super(name);
}
@Override
public void
sendText(String to, String message) {
System.out.println("钻石会员发送信息：");
chatroom.sendText(name,to,message); //发送
}
@Override
public void
sendImage(String to, String image) {
System.out.println("钻石会员发送图片：");
chatroom.sendImage(name,to,image);
//发送
}
}
package rjsj.no19;
public abstract class Member {
protected
AbsChatroom chatroom;
protected String
name;
public Member(String
name) {
this.name =
name;
}
public
AbsChatroom getChatroom() {
return chatroom;
}
public void
setChatroom(AbsChatroom 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" + 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);
}
}
package rjsj.no19;
import java.text.SimpleDateFormat;
import java.util.Date;
public class NewMember extends Member{
public
NewMember(String name) {
super(name);
}
public static
String getTime() {//获取日期
Date date = new
Date();
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy
HH:mm:ss");
return "发送时间："+formatter.format(date);
}
@Override
public void
sendText(String to, String message) {
System.out.println("新会员发送信息：");
chatroom.sendText(name,to,message
+ '\t' +getTime()); //发送
}
@Override
public void
sendImage(String to, String image) {
System.out.println("新会员发送图片：");
chatroom.sendImage(name,to,image);
//发送
}
}
package rjsj.no19;
public abstract class AbsChatroom {
public abstract void
register(Member member);
public abstract void
sendText(String form,String to,String message);
public abstract void
sendImage(String form,String to,String message);
}
package rjsj.no19;
import java.util.Hashtable;
public class ChatRoom extends AbsChatroom{
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
form, String to, String message) {
Member member
= (Member) members.get(to);
if
(message.length() > 100) {
System.out.println("文字长度大于100个字符,发送失败！");
} else {
String
newMessage = message.replaceAll("日","*");;
member.receiveText(form,newMessage);
}
}
@Override
public void
sendImage(String form, String to, String image) {
Member member
= (Member) members.get(to);
//模拟图片大小判断
if(image.length()>20) {
System.out.println("图片大于20M，发送失败！");
}
else {
member.receiveImage(form,image);
}
}
}
package rjsj.no19;
public class Client {
public static void
main(String[] args) {
AbsChatroom happyChat = new ChatRoom();
Member
member1,member2,member3,member4,member5;
member1 = new
DiamondMember("张三");
member2 = new
DiamondMember("李四");
member3 = new
CommonMember("王五");
member4 = new
NewMember("小芳");
happyChat.register(member1);
happyChat.register(member2);
happyChat.register(member3);
happyChat.register(member4);
member1.sendText("李四","李四，你好！");
member2.sendText("张三","张三，你好！");
member1.sendText("李四","今天天气不错，有日！");
member2.sendText("张三","你说什么？");
member1.sendImage("李四","太阳.jpg");
member2.sendImage("张三","偷笑.jpg--------------------------------------------------------");
System.out.println("--------------------------------------------------------------------------------");
member3.sendText("小芳","听说聊天室新成员的信息会附带发送时间！");
member4.sendText("王五","哈哈");
}
}
package rjsj.no19;
public class CommonMember extends Member{
public CommonMember(String
name) {
super(name);
}
@Override
public void
sendText(String to, String message) {
System.out.println("普通会员发送信息：");
chatroom.sendText(name,to,message);
//发送
}
@Override
public void sendImage(String
to, String image) {
System.out.println("普通会员不能发送图片！");
}
}
C++
#include<iostream>
#include<map>
#include<ctime>
#include<sstream>
using namespace std;
class AbstractChatroom;
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)
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 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;
}
};
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;
};
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);
}
}
};
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=m_replace(message,"日", "*");
if(message.length()>100)
{
cout<<"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 NewChat();
stringstream
ss;//生成100个以上的字符
for(int i=0;i<110;i++)
{
ss <<"-";
}
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！");
member1->sendText("李四","今天天气不错，有日！");
member2->sendImage("张三","太阳");
member3->sendText("小芳","还有问题吗？");
member3->sendText("小红","还有问题吗？");
member4->sendText("王五","没有了，谢谢！");
member5->sendText("王五","我也没有了！");
member6->sendText("王五",ss.str());
}
运行截图：
2. 注意编程规范。
