spring mvc静态资源访问的配置

　　如果我们使用spring mvc来做web访问请求的控制转发，那么默认所有访问都将被DispatcherServlet独裁统治。比如我现在想访问的欢迎页index.html根本无需任何业务逻辑处理，仅仅就展示一句话而已，但spring mvc还是会把访问index.html这件事交给DispatcherServlet处理，而DispatcherServlet会从HandlerMapping去找对应Controller注解，如果找不到就报错了：

No mapping found for HTTP request with URI [/index.html] in DispatcherServlet with name 'service-dispatcher'

　　spring mvc提供的解决方案是在配置文件中加入mvc:resources来专门标识静态资源，比如我的web.xml是这样的：

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Memcache View Application</display-name>

    <servlet>
        <servlet-name>service-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>service-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-core.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

　　那么我的spring-mvc.xml就要是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<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/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd ">

    <context:component-scan base-package="com.wulinfeng.memcache.view" />
    <mvc:annotation-driven />
    <mvc:resources location="/" mapping="/**/*.js"/>
    <mvc:resources location="/" mapping="/**/*.css"/>
    <mvc:resources location="/" mapping="/**/*.png"/>
    <mvc:resources location="/" mapping="/*.html"/>
</beans>

　　这时就可以顺利访问index.html这个欢迎页了。其他js、css或png图片的静态资源也可以直接访问。如果我还要做拦截，比如登陆功能，又不想拦截到静态资源，怎么办呢？最简单的就是配置拦截时过滤静态资源：

    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <mvc:exclude-mapping path="/**/*.css" />
            <mvc:exclude-mapping path="/**/*.js" />
            <mvc:exclude-mapping path="/**/*.png" />
            <mvc:exclude-mapping path="*.html" />
            <mvc:exclude-mapping path="/login**" />
            <mvc:exclude-mapping path="/register**" />
            <mvc:exclude-mapping path="/getVerifyCode**" />
            <mvc:exclude-mapping path="/getMethod/**" />
            <bean class="com.wulinfeng.test.testpilling.util.InterceptorUtil" />
        </mvc:interceptor>
    </mvc:interceptors>