Spring附有一些简单的窗体处理handler,这些handler都实现了Controller接口,您可以使用这些类别,让它自动为您收集窗体参数并填入窗体对象(form object),而无需您亲自处理这些细节。
org.springframework.web.servlet.mvc.SimpleFormController是Spring提供的一个 Controller接口实现,以下实现一个窗体登入程序,以示范SimpleFormController的作用,首先我们先设计一个 form.jsp:
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窗体中传递两个参数username与password,注意method是post,这样待会Spring才会将我们的参数填入窗体对象中。先看看我们的LoginAction:
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LoginAction继承了SimpleFormController,并重新定义其onSumit()方法,Spring会呼叫这个方 法,onSumit()接收command对象,这个对象代表了窗体对象,onSumit()有几个不同的版本,这边所使用的是最简单的版本,您可以看看 API文件了解它的其它版本。
getSuccessView()与getFormView()是SimpleFormController中定义的两个方法,分别表示通过验证与物败的目标网页,我们待会可以直接在Bean定义档中定义,先来看看窗体对象,它只是个简单的JavaBean:
LoginForm.java :
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Spring会收集Request中相关的参数,并将之填入有对应到的属性,至于LoginAction如何得到command,这我们要在Bean定义档中撰写:
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在loginAction中的commandClass,即使定义它所要使用的窗体对象,注意我们也定义了successView与formView,其中我们的success.jsp如下:
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登入成功的话,会进入success.jsp并显示使用者的名称,登入失败的话,依formView的设定,会回到原来的登入窗体。
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以上文章转自:http://www.blogjava.net/liuwentao253/archive/2007/01/31/96982.html