中介者模式一多人聊天室

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一模式定义

中介者模式，用一个中介对象来封装一系列对象之间的交互，使各个对象中不需要显示地引用其他对象实例，从而降低各个对象之间的耦合度，并且可以独立地改变对象间的交互关系。

二模式举例

1模式分析

我们借用多人聊天室来说明这一模式

2中介模式静态类图

3代码示例

3.1中介者接口——IMediator

package com.demo.mediator;import com.demo.colleague.IUser;/** * 中介者接口 *  * @author *  */public interface IMediator {/** * 注册用户信息 *  * @param user */public void regist(IUser user);/** * 发送消息给所有人 *  * @param user *            发送消息人 */public void notifyAllMessage(IUser user);}

3.2中介者实现——ConcreteMediator

package com.demo.mediator;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import com.demo.colleague.IUser;/** * 中介者实现类 *  * @author *  */public class ConcreteMediator implements IMediator {private final List<IUser> list = new ArrayList<IUser>();/** * 注册用户信息 *  * @param user */public void regist(IUser user) {if (user != null && !list.contains(user)) {list.add(user);}}/** * 发送消息 *  * @param user *            发送消息人 */public void notifyAllMessage(IUser user) {Iterator<IUser> iterator = list.iterator();IUser tmpUser = null;while (iterator.hasNext()) {tmpUser = iterator.next();if (tmpUser != null && !tmpUser.equals(user)) {// 排除发送消息用户tmpUser.receiveMessage(user.getMessage());}}}}

3.3用户接口——IUser

package com.demo.colleague;/** * 用户接口 *  * @author *  */public interface IUser{/** * 接收消息 *  * @param message *            消息 */public void receiveMessage(String message);/** * 发送消息 *  * @param message *            消息 */public void sendMessage(String message);/** * 获得发送的消息内容 *  * @return */public String getMessage();}

3.4抽象用户——AbstractUser

package com.demo.colleague;import com.demo.mediator.IMediator;/** * 抽象用户信息 *  * @author *  */public abstract class AbstractUser implements IUser{// 中介者protected IMediator mediator;// 姓名protected String name;// 消息protected String message;public AbstractUser(IMediator mediator, String name){this.mediator = mediator;this.name = name;}/** * 发送消息 *  * @param message *            消息 */public void sendMessage(String message){this.message = message;System.out.println(this.name + " 说:" + this.message);mediator.notifyAllMessage(this);}public String getMessage(){return message;}}

3.5用户A——UserA

package com.demo.colleague;import com.demo.mediator.IMediator;/** * 用户A *  * @author *  */public class UserA extends AbstractUser {public UserA(IMediator mediator, String name) {super(mediator, name);// 注册到中介者对象中mediator.regist(this);}/** * 接收消息方法 */public void receiveMessage(String message) {System.out.println("User A Received Message : " + message);}}

3.6用户B——UserB

package com.demo.colleague;import com.demo.mediator.IMediator;/** * 用户B *  * @author *  */public class UserB extends AbstractUser {public UserB(IMediator mediator, String name) {super(mediator, name);// 注册到中介者对象中mediator.regist(this);}/** * 接收消息方法 */public void receiveMessage(String message) {System.out.println("User B Received Message : " + message);}}

3.7用户C——UserC

package com.demo.colleague;import com.demo.mediator.IMediator;/** * 用户C *  * @author *  */public class UserC extends AbstractUser {public UserC(IMediator mediator, String name) {super(mediator, name);// 注册到中介者对象中mediator.regist(this);}/** * 接收消息方法 */public void receiveMessage(String message) {System.out.println("User C Received Message : " + message);}}

3.8运行多人聊天室

package com.demo;import com.demo.colleague.IUser;import com.demo.colleague.UserA;import com.demo.colleague.UserB;import com.demo.colleague.UserC;import com.demo.mediator.ConcreteMediator;import com.demo.mediator.IMediator;/** *  * 主应用程序 *  * @author *  */public class Client {/** * @param args */public static void main(String[] args) {// 创建聊天室（中介者）IMediator mediator = new ConcreteMediator();// 创建用户信息IUser userA = new UserA(mediator, "张三");IUser userB = new UserB(mediator, "李四");IUser userC = new UserC(mediator, "王五");System.out.println("============================================================");userA.sendMessage("大家好，我叫张三！初来乍到，请多多关照！");System.out.println("============================================================\n");System.out.println("============================================================");userB.sendMessage("你好，我叫李四，欢迎加入！");System.out.println("============================================================\n");System.out.println("============================================================");userC.sendMessage("我是王五，欢迎欢迎！");System.out.println("============================================================\n");}}

4运行结果

============================================================

张三说:大家好，我叫张三！初来乍到，请多多关照！

User B Received Message : 大家好，我叫张三！初来乍到，请多多关照！

User C Received Message : 大家好，我叫张三！初来乍到，请多多关照！

============================================================

李四说:你好，我叫李四，欢迎加入！

User A Received Message : 你好，我叫李四，欢迎加入！

User C Received Message : 你好，我叫李四，欢迎加入！

============================================================

王五说:我是王五，欢迎欢迎！

User A Received Message : 我是王五，欢迎欢迎！