学步园

1、springmvc的DispatcherServlet过滤器：

问题是这样的：在SpringMVC项目中，如果web.xml中配置为这样：

<servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>
                       org.springframework.web.servlet.DispatcherServlet
                </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
  
    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

那静态资源，如js文件、css文件、图片等，都会经过org.springframework.web.servlet.DispatcherServlet过滤，DispatcherServlet当然处理不了这些文件，所以这些文件就发送不到客户端了。

SpringMVC从3.0.4版本开始，新增了一种配置可以解决这个问题，具体配置如下：

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="

http://www.springframework.org/schema/mvc


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


http://www.springframework.org/schema/beans


http://www.springframework.org/schema/beans/spring-beans-3.2.xsd


http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-3.2.xsd">
  
    <context:component-scan base-package="com.XXX.XXX" />
  
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/pages/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
     
    <mvc:resources location="/r/" mapping="/r/**" />
    <mvc:annotation-driven /> 
</beans>

新增的是<mvc:resources location="/r/" mapping="/r/**" />这个配置，相当于告诉SpringMVC，凡是请求路径为 /r/ 开始的，都自动映射到 r目录 下面相同文件名的文件去，而不经过DispatcherServlet过滤，这样就已经搞定了。

<mvc:interceptors>
		<!-- 用户的session拦截器-->
		<mvc:interceptor>
			<mvc:mapping path="/**"/>
			<bean id="sessionInterceptor" class="com.ifeng.iis.common.interceptors.SessionInterceptor"></bean>
		</mvc:interceptor>
</mvc:interceptors>

<mvc:interceptors>
		<!-- 用户的session拦截器-->
		<mvc:interceptor>
			<mvc:mapping path="/**"/>
			<mvc:exclude-mapping path="/css/**"/>
			<mvc:exclude-mapping path="/js/**"/>
			<mvc:exclude-mapping path="/images/**"/>
			<bean id="sessionInterceptor" class="com.ifeng.iis.common.interceptors.SessionInterceptor"></bean>
		</mvc:interceptor>
</mvc:interceptors>

<servlet-mapping>  
    <servlet-name>default</servlet-name>  
    <url-pattern>/js/*</url-pattern>  
    <url-pattern>/css/*</url-pattern>  
    <url-pattern>/images/*</url-pattern>  
    <url-pattern>/fonts/*</url-pattern>  
</servlet-mapping>

tomcat,jboss,glassfish,jetty : defaut;  
weblogic : FileServlet;  
websphere : SimpleFileServlet;  
resin : resin-file;  
GAE : _ah_default