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<title> 设计模式之Mediator 中介者模式</title>
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<h3 align="center">设计模式之Mediator(中介者)</h3>
<p align="center"><a href="http://www.jdon.com/aboutme.htm">板桥里人</a> http://www.jdon.com 2002/05/05</p>
<p align="center"><a href="../mybook/index.htm" target="_blank"><strong>模式实战书籍《Java实用系统开发指南》</strong></a></p>
<p>Mediator中介者模式定义:<br>
用一个中介对象来封装一系列关于对象交互行为.</p>
<p>为何使用Mediator?<br>
各个对象之间的交互操作非常多;每个对象的行为操作都依赖彼此对方,修改一个对象的行为,同时会涉及到修改很多其他对象的行为,如果使用Mediator模式,可以使各个对象间的耦合松散,只需关心和
Mediator的关系,使多对多的关系变成了一对多的关系,可以降低系统的复杂性,提高可修改扩展性.</p>
<p>如何使用?</p>
<p>首先 有一个接口,用来定义成员对象之间的交互联系方式:</p>
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<td bgcolor="#CCCCCC">public interface Mediator { }</td>
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<p>Meiator具体实现,真正实现交互操作的内容:</p>
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<p>public class ConcreteMediator implements Mediator {</p>
<p> //假设当前有两个成员.<br>
private ConcreteColleague1 colleague1 = new ConcreteColleague1();
<br>
private ConcreteColleague2 colleague2 = new ConcreteColleague2();
</p>
<p> ... </p>
<p>} </p>
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</table>
<p>再看看另外一个参与者:成员,因为是交互行为,都需要双方提供一些共同接口,这种要求在Visitor Observer等模式中都是相同的.</p>
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<p>public class Colleague {<br>
private Mediator mediator;<br>
public Mediator getMediator() { <br>
return mediator;<br>
}<br>
<br>
public void setMediator( Mediator mediator ) { <br>
this.mediator = mediator; <br>
}<br>
}</p>
<p>public class ConcreteColleague1 { }</p>
<p>public class ConcreteColleague2 { }</p>
</td>
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<p>每个成员都必须知道Mediator,并且和 Mediator联系,而不是和其他成员联系.</p>
<p>至此,Mediator模式框架完成,可以发现Mediator模式规定不是很多,大体框架也比较简单,但实际使用起来就非常灵活.</p>
<p>Mediator模式在事件驱动类应用中比较多,例如界面设计GUI.;聊天,消息传递等,在聊天应用中,需要有一个MessageMediator,专门负责request/reponse之间任务的调节.</p>
<p>MVC是J2EE的一个基本模式,View Controller是一种Mediator,它是Jsp和服务器上应用程序间的Mediator.<br>
</p>
<p> </p>
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