Spring 3 MVC – 调用Controller但未找到视图

我正在尝试建立一个框架Spring 3 MVC项目,但我很难获得渲染视图.我遵循了mvc-basic示例项目中描述的结构,并在http://blog.springsource.com/2009/12/21/mvc-simplifications-in-spring-3-0/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Interface21TeamBlog+%28SpringSource+Team+Blog%29处设置了web.xml,app-config.xml和mvc-config.xml文件.控制器被调用,但当它到达查找视图并呈现它时,我得到404错误.文件如下：

web.xml中：

dispatcherServletaram>
            aram-name>contextConfigLocationaram-name>
            aram-value>
                /WEB-INF/app-config.xml
            aram-value>
        aram>
        servlet-mapping>
        servlet-mapping>

APP-config.xml文件：

spring-beans-3.0.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">