SSM项目引入文件失败

  
        <mvc:resources mapping="/styles/**"  
        location="/css/"/>   
        <mvc:resources mapping="/images/**"  
        location="/images/"/>   
<mvc:resources mapping="/js/**" location="/js/"/>
        <mvc:default-servlet-handler />   

或者

<servlet-mapping> 
        <servlet-name>default</servlet-name> 
        <url-pattern>*.css</url-pattern> 
    </servlet-mapping> 
 
    <servlet-mapping> 
        <servlet-name>default</servlet-name> 
        <url-pattern>*.gif</url-pattern> 
    </servlet-mapping> 
 
    <servlet-mapping> 
        <servlet-name>default</servlet-name> 
        <url-pattern>*.jpg</url-pattern> 
    </servlet-mapping> 
 
    <servlet-mapping> 
        <servlet-name>default</servlet-name> 
        <url-pattern>*.js</url-pattern> 
    </servlet-mapping>