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；
2. 注意编程规范。
1.
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！");
}
}
