困惑：关于Web.xml 与Spring 设置

web.xml的配置情况:

摘取网络上对于Web.xml的理解：首先对于各个元素的加载顺序是与各个元素声明的顺序无关,其次对于加载的顺序将是：servlet-context -- context-param - listener - servlet

对于我这个文件，首先系统加载Servlet-context, 然后加载context-param指定的两个文件，再加载指定的Listener,最后加载定义的servlet.

当我在controllers.xml加入<context:component-scan base-package="com.baidu" /> 当我进行url访问时，提示No Mapping. 是不是以为着只有DispatchServlet才有映射url的能力，因为我在我的UserShow Bean 里面声明了@RequestMapping(name=“userInfo.htm", method=RequestMethod.GET), 而此时提示的No Mapping 错误，当我移动到application.xml里面则映射正确。

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>SpringTutorial</display-name>

<welcome-file-list>
<welcome-file>welcome.html</welcome-file>
</welcome-file-list>

<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
             config/viewer.xml,
             config/controllers.xml
</param-value>
</context-param>

<servlet>
<servlet-name>dispatch</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>config/applicationContext.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatch</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
</web-app>

viewer.xml: 指定ViewResolver.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">


<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>    
</bean>

</beans>

controllers.xml: 指定数据源的定义

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
">
<bean id="sessionFactory"
  class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<description>Proxool Description</description>
<property name="packagesToScan">
<value>com.baidu.model</value>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.proxool.xml">proxool.xml</prop>
<prop key="hibernate.proxool.pool_alias">dbpool</prop>
<prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
<prop key="hibernate.connection.release_mode">auto</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.connection.provider_class">org.hibernate.connection.ProxoolConnectionProvider</prop>
</props>
</property>  
</bean>  
</beans>

Finally: 在controllers通过contexLoaderListener进行加载时，其默认并不加载@Controller，而在通过Servlet进行加载时，@Controller作为Component的子集，也是加载如入该子集的行为，而在controller.xml中只执行其母集Component的行为，所以会照成NO Mapping的现象发生。

解决方法：

 1. 将加载Mapping的行为放入servlet加载的xml

 2. 在Context-param，也就是Listener加载的xml的文件中加入如下的定义：

xml:ns="http://www.springframwork.org/schema/mvc"
xml:schemaLocation="http://www.springframwork.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
<mvc:annotation-driven />

转载于:https://www.cnblogs.com/papertigerv5/archive/2011/11/04/2236467.html