SpringMVC概要SpringMVC的总控：DispatcherServletweb.xml中的声明：<context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/app-*.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/springmvc-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/*</url-pattern></servlet-mapping>1、ContextLoaderListener创建rootwebApplicationContext2、DispatcherServlet创建servlet-specific的webApplicationContext，继承并覆盖root的定义。init-param可选，缺省查找/WEB-INF/{servletName}-servlet.xml。示例中该文件放在classpath中便于使用mavenresources插件进行环境变量替换。3、DispatcherServlet会默认初始化一些特定类型的bean，见/org/springframework/web/servlet/DispatcherServlet.properties中的说明。4、这些特定类型的Bean，可在*-servlet.xml中声明，覆盖默认定义，或者声明多个不同实现，spring根据他们的order属性来做优先级处理。这些类构建了springmvc的整个处理流程的主体。见下图（图片来源《Spring3.x企业应用开发实战》）{servletName}-servlet.xml配置,初始化默认的框架级别的bean。<mvc:annotation-driven/>spring3.1mvc默认实现变化：HandlerMapping和HandlerAdapter，spring3.1的这两个接口的默认实现：org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMappingCreatesRequestMappingInfoinstancesfromtypeandmethod-level@RequestMappingannotationsin@Controllerclasses.org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapterAnAbstractHandlerMethodAdapterthatsupportsHandlerMethodswiththesignature--methodargumentandreturntypes,definedin@RequestMapping.多了几个接口：HandlerMethodArgumentResolver/HandlerMethodReturnValueHandler，因此MVCXMLNamespace下的配置有些变化，可扩展点更多。暂时只需了解即可。<beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:mvc="htt