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：
- 新的具体聊天室中发送的图片大小不得超过20M。
- 新的具体聊天室中发送的文字长度不得超过100个字符。
- 新的具体会员类可以发送图片信息和文本信息。
- 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。
package org.example.shiyan19;
public class main {
public static void main(String args[]) {
AbstractChatroom r1 = new NewGroup();
Member m1, m2, m3;
m1 = new NewMember("小李");
m2 = new NewMember("小红");
m3 = new NewMember("张三");
r1.register(m1);
r1.register(m2);
r1.register(m3);
m1.sendtext("小红", "：小红，你好");
m2.sendtext("小李", "：小李，你好");
m1.sendtext("小红", "：吃饭了吗？");
m2.sendtext("小李", "：吃了");
m1.sendtext("张三", "：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
m3.sendimage("小李", "：哈哈.jpg");
m2.sendimage("张三", "：哈哈.jpg--------------------");
}
}
package org.example.shiyan19;
public abstract class AbstractChatroom {
public abstract void register(Member m);
public abstract void sendtext(String a, String b, String mess);
public abstract void sendimage(String a, String b, String mess);
}
package org.example.shiyan19;
import java.util.Hashtable;
public class ChatGroup extends AbstractChatroom {
private Hashtable ms = new Hashtable();
public void register(Member m) {
if (!ms.contains(m)) {
ms.put(m.getname(), m);
m.setroom(this);
}
}
public void sendtext(String a, String b, String c) {
Member m = (Member) ms.get(b);
String newm = c;
newm = c.replaceAll("日", "*");
m.receivetext(a, newm);
}
public void sendimage(String a, String b, String c) {
Member m = (Member) ms.get(b);
if (c.length() > 5) {
System.out.println("图片较大，发送失败");
} else {
m.receiveimage(a, c);
}
}
}
package org.example.shiyan19;
public class CommonMember extends Member {
public CommonMember(String a) {
super(a);
}
public void sendtext(String a, String c) {
System.out.println("普通会员发送消息");
room.sendtext(name, a, c);
}
public void sendimage(String a, String c) {
System.out.println("普通会员不能发送图片");
}
}
package org.example.shiyan19;
public class DiamondMember extends Member {
public DiamondMember(String a) {
super(a);
}
public void sendtext(String a, String c) {
System.out.println("钻石会员发送消息");
room.sendtext(name, a, c);
}
public void sendimage(String a, String c) {
System.out.println("钻石会员发送图片");
room.sendimage(name, a, c);
}
}
//Member.java
package org.example.shiyan19;
public abstract class Member {
protected AbstractChatroom room;
protected String name;
public Member(String a){
name=a;
}
public String getname(){
return name;
}
public void setname(String a){
name=a;
}
public AbstractChatroom getroom(){
return room;
}
public void setroom(AbstractChatroom a){
room=a;
}
public abstract void sendtext(String a,String mess);
public abstract void sendimage(String a,String image);
public void receivetext(String a,String mess){
System.out.println(a+"发送的给"+name+"内容是"+mess);
}
public void receiveimage(String a,String image){
System.out.println(a+"发送的给"+name+"内容是"+image);
}
}
package org.example.shiyan19;
import java.util.HashMap;
import java.util.Map;
public class NewGroup extends AbstractChatroom {
Map<String, Member> table = new HashMap<>();
public void register(Member member) {
table.put(member.getname(), member);
member.setroom(this);
}
public void sendtext(String from, String to, String message) {
if (message.length() >= 100) {
System.out.println("超过100个字符，发送失败");
} else {
Member member = table.get(to);
if (member != null)
member.receivetext(from, message);
}
}
public void sendimage(String from, String to, String message) {
if (message.length() >= 20) {
System.out.println("图片超过20M，发送失败");
} else {
Member member = table.get(to);
if (member != null)
member.receiveimage(from, message);
}
}
}
package org.example.shiyan19;
public class NewMember extends Member {
public NewMember(String a) {
super(a);
}
public void sendtext(String a, String c) {
System.out.println("新会员发送消息：");
room.sendtext(name, a, c);
}
public void sendimage(String a, String c) {
System.out.println("新会员发送图片：");
room.sendimage(name, a, c);
}
}
