中介者模式——java实现 - 戈瑾

中介者模式——java实现

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。

Java源代码：

  1 //Member.java
  2 package shiyan19;
  3 
  4 public abstract class Member {
  5     protected AbstractChatroom room;
  6     protected String name;
  7     public Member(String a){
  8         name=a;
  9     }
 10     public String getname(){
 11         return name;
 12     }
 13     public void setname(String a){
 14         name=a;
 15     }
 16     public AbstractChatroom getroom(){
 17         return room;
 18     }
 19     public void setroom(AbstractChatroom a){
 20         room=a;
 21     }
 22     public abstract void sendtext(String a,String mess);
 23     public abstract void sendimage(String a,String image);
 24     public void receivetext(String a,String mess){
 25         System.out.println(a+"发送的给"+name+"内容是"+mess);
 26     }
 27     public void receiveimage(String a,String image){
 28         System.out.println(a+"发送的给"+name+"内容是"+image);
 29     }
 30 }
 31 //CommonMember.java
 32 package shiyan19;
 33 
 34 
 35 public class CommonMember extends Member{
 36     public CommonMember(String a){
 37         super(a);
 38     }
 39     public void sendtext(String a,String c){
 40         System.out.println("普通会员发送消息");
 41         room.sendtext(name,a,c);
 42     }
 43     public void sendimage(String a,String c){
 44         System.out.println("普通会员不能发送图片");
 45     }
 46 }
 47 //DiamondMember.java
 48 package shiyan19;
 49 
 50 public class DiamondMember extends Member{
 51     public DiamondMember(String a){
 52         super(a);
 53     }
 54     public void sendtext(String a,String c){
 55         System.out.println("钻石会员发送消息");
 56         room.sendtext(name,a,c);
 57     }
 58     public void sendimage(String a,String c){
 59         System.out.println("钻石会员发送图片");
 60         room.sendimage(name,a,c);
 61     }
 62 }
 63 //NewGroup.java
 64 package shiyan19;
 65 
 66 import java.util.HashMap;
 67 import java.util.Map;
 68 public class NewGroup extends AbstractChatroom{
 69 
 70         Map<String,Member> table = new HashMap<>();
 71         public void register(Member member) {
 72             table.put(member.getname(), member);
 73             member.setroom(this);
 74         }
 75 
 76         public void sendtext(String from, String to, String message) {
 77             if(message.length()>=100){
 78                 System.out.println("超过100个字符，发送失败");
 79             }else{
 80                 Member member = table.get(to);
 81                 if(member!=null)
 82                     member.receivetext(from, message);
 83             }
 84         }
 85 
 86         public void sendimage(String from, String to, String message) {
 87             if(message.length()>=20){
 88                 System.out.println("图片超过20M，发送失败");
 89             }else{
 90                 Member member = table.get(to);
 91                 if(member!=null)
 92                     member.receiveimage(from, message);
 93             }
 94         }
 95 
 96 }
 97 //NewMember.java
 98 package shiyan19;
 99 
100 public class NewMember extends Member{
101     public NewMember(String a){
102         super(a);
103     }
104     public void sendtext(String a,String c){
105         System.out.println("新会员发送消息：");
106         room.sendtext(name,a,c);
107     }
108     public void sendimage(String a,String c){
109         System.out.println("新会员发送图片：");
110         room.sendimage(name,a,c);
111     }
112 }
113 //AbstractChatroom.java
114 package shiyan19;
115 
116 public abstract class AbstractChatroom {
117     public abstract void register(Member m);
118     public abstract void sendtext(String a,String b,String mess);
119     public abstract void sendimage(String a,String b,String mess);
120 }
121 //ChatGroup.java
122 package shiyan19;
123 
124 import java.util.*;
125 
126 public class ChatGroup extends AbstractChatroom{
127     private Hashtable ms=new Hashtable();
128     public void register(Member m)
129     {
130         if(!ms.contains(m)){
131             ms.put(m.getname(),m);
132             m.setroom(this);
133         }
134     }
135     public void sendtext(String a,String b,String c){
136         Member m=(Member)ms.get(b);
137         String newm=c;
138         newm=c.replaceAll("日","*");
139         m.receivetext(a,newm);
140     }
141     public void sendimage(String a,String b,String c){
142         Member m=(Member)ms.get(b);
143         if(c.length()>5){
144             System.out.println("图片较大，发送失败");
145         }else{
146             m.receiveimage(a,c);
147         }
148     }
149 }
150 //main.java
151 package shiyan19;
152 
153 public class main {
154     public static void main(String args[]){
155         AbstractChatroom r1=new NewGroup();
156         Member m1,m2,m3;
157         m1=new NewMember("小李");
158         m2=new NewMember("小红");
159         m3=new NewMember("张三");
160         r1.register(m1);
161         r1.register(m2);
162         r1.register(m3);
163         m1.sendtext("小红","：小红，你好");
164         m2.sendtext("小李","：小李，你好");
165         m1.sendtext("小红","：吃饭了吗？");
166         m2.sendtext("小李","：吃了");
167         m1.sendtext("张三","：---------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
168         m3.sendimage("小李","：哈哈.jpg");
169         m2.sendimage("张三","：哈哈.jpg--------------------");
170     }
171 }

运行结果：

posted on 2021-11-11 18:46 戈瑾阅读(142) 评论(0) 编辑收藏举报

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