Java 在spring 3.x中实现SimpleFormController时，不会调用commandClass setter方法

在spring 3.x中实现SimpleFormController时，不会调用commandClass setter方法，在命令odject上调用getter方法会返回null值

• uploadMessageBundle.jsp

**xml文件中的bean配置**

<bean id="uploadMessageBundleController" class="org.sakaiproject.adminmessagebundle.tool.UploadMessageBundleController">
            <property name="messageBundleService"><ref bean="org.sakaiproject.messagebundle.api.MessageBundleService"/></property>
            <property name="commandClass" value="org.sakaiproject.adminmessagebundle.tool.FileUploadBean"/>
            <property name="commandName" value="command"/>
            <property name="formView" value="uploadMessageBundle"/>
            <property name="successView" value="redirect:messageBundleHome.htm"/>
        </bean>

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我错过了.xml文件中的以下bean定义，因此它无法为表单中上载的文件调用commandClass中的setter方法

<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

<bean id="uploadMessageBundleController" class="org.sakaiproject.adminmessagebundle.tool.UploadMessageBundleController">
            <property name="messageBundleService"><ref bean="org.sakaiproject.messagebundle.api.MessageBundleService"/></property>
            <property name="commandClass" value="org.sakaiproject.adminmessagebundle.tool.FileUploadBean"/>
            <property name="commandName" value="command"/>
            <property name="formView" value="uploadMessageBundle"/>
            <property name="successView" value="redirect:messageBundleHome.htm"/>
        </bean>

<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />