设计自己的MVC框架
取这样一个标题太大,吸引眼球嘛@_@。
事实是最近读《J2EE设计模式》讲述表达层模式的那几章,书中有一个前端控制器+command模式的workflow例子,就琢磨着可以很简单地扩展成一个MVC框架。花了一个下午改写了下,对书中所述的理解更为深入。我想这也许对于学习和理解设计模式,以及初次接触struts等MVC框架的人可能有点帮助。因为整个模型类似于struts,我把它取名叫strutslet^_^
(一)完整的类图如下:
1。前端控制器(FrontController):前端控制器提供了一个统一的位置来封装公共请求处理,它的任务相当简单,执行公共的任务,然后把请求转交给相应的控制器。在strutslet中,前端控制器主要作用也在于此,它初始化并解析配置文件,接受每个请求,并简单地把请求委托给调度器(Dispatcher),由调度器执行相应的动作(Action)。调度器把action返回的url返回给FrontController, FrontController负责转发。
2。Action接口:command模式很好的例子,它是一个命令接口,每一个实现了此接口的action都封装了某一个请求:新增一条数据记录并更新model,或者把某个文件写入磁盘。命令解耦了发送者和接受者之间联系。发送者调用一个操作,接受者接受请求执行相应的动作,因为使用Command模式解耦,发送者无需知道接受者任何接口。
3。Dispatcher:调度器,负责流程的转发,负责调用action去执行业务逻辑。由调度器选择页面和action,它去除了应用行为和前端控制器间的耦合。调度器服务于前端控制器,它把model的更新委托给action,又提供页面选择给FrontController
4。ActionForward:封装了转向操作所需要信息的一个模型,包括name和转向url
5。ActionModel:解析配置文件后,将每一个Action封装成一个ActionModel对象,所有ActionModel构成一个map,并存储在ServletContext中,供整个框架使用。
(二)源代码分析:
1。Action接口,只有一个execute方法,任何一个action都只要实现此接口,并实现相应的业务逻辑,最后返回一个ActionForward,提供给Dispacher调用。
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比如,我们要实现一个登陆系统,LoginAction验证用户名和密码,如果正确,返回success页面,如果登陆失败,返回fail页面:
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2。还是先来看下两个模型:ActionForward和ActionModel,没什么东西,属性以及相应的getter,setter方法:
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3。知道了两个模型是什么样,也应该可以猜到我们的配置文件大概是什么样的了,与struts的配置文件格式类似:
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path是在应用中将被调用的路径,class指定了调用的哪个action,forward元素指定了转向,比如我们这里如果是success就转向hello.jsp,失败的话转向fail.jsp,这里配置了demo用到的LoginAction。
4。Dispacher接口,主要是getNextPage方法,此方法负责获得下一个页面将导向哪里,提供给前端控制器转发。
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5。原先书中实现了一个WorkFlow的Dispatcher,按照顺序调用action,实现工作流调用。而我们所需要的是根据请求的path 调用相应的action,执行action的execute方法返回一个ActionForward,然后得到ActionForward的 viewUrl,将此viewUrl提供给前端控制器转发,看看它的getNextPage方法:
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6。前端控制器(FrontController),它的任务我们已经很清楚,初始化配置文件;存储所有action到 ServletContext供整个框架使用;得到发起请求的path,提供给Dispachter查找相应的action;调用Dispatcher,执行getNextPage方法得到下一个页面的url并转发:
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doGet()和doPost方法我们都让它调用process方法:
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7。最后,web.xml的配置就非常简单了,配置前端控制器,提供启动参数(配置文件所在位置,为空就查找/WEB-INF/下面的strutslet-config.xml文件),我们把所有以action结尾的请求都交给FrontController处理:
![None.gif](http://www.blogjava.net/Images/OutliningIndicators/None.gif)
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