大三每日总结

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；
package ZhongJie;

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 ZhongJie;

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 ZhongJie;

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 ZhongJie;

public class DiamondMember extends Member {
public DiamondMember(String a) {
super(a);
}

public void sendtext(String a, String c) {
System.out.println("高级会员发送消息");
room.sendtext(name, a, c);
}

public void sendimage(String a, String c) {
System.out.println("高级会员发送图片");
room.sendimage(name, a, c);
}
}
package ZhongJie;

public class main {
public static void main(String args[]) {
AbstractChatroom r1 = new NewGroup();
Member m1, m2, m3;
m1 = new NewMember("小一");
m2 = new NewMember("小二");
m3 = new NewMember("小三");
r1.register(m1);
r1.register(m2);
r1.register(m3);
m1.sendtext("小一", "：小一，你好");
m2.sendtext("小二", "：小二，你好");
m1.sendtext("小一", "：你在家吗？");
m2.sendtext("小二", "：在");
m1.sendtext("小三", "：---------");
m3.sendimage("小二", "：哈哈.jpg");
m2.sendimage("小三", "：哈哈.jpg-----");
}
}
package ZhongJie;

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 ZhongJie;

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 ZhongJie;

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);
}
}

2. 注意编程规范。