把http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd改成http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

不然会报：

cvc-complex-type.2.4.a: Invalid content was found starting with element 'mvc:exclude-mapping'. One 
 of '{"http://www.springframework.org/schema/mvc":mapping, "http://www.springframework.org/
 schema/beans":bean}' is expected.

因为mvc:exclude-mapping 标签不被spring-mvc-3.0.xsd支持，该配置在spring-mvc-3.2.xsd中