SpringMVC的学习例子(包含以下学习例子)

• Servlet,Listener,Filter,Interceptor.
• JavaMail,排序(冒泡,快速).
• 整合Spring.

###Filter

<filter>
        <filter-name>helloFilter</filter-name>
        <filter-class>com.springmvc.filter.HelloFilter</filter-class>
</filter>

<filter-mapping>
        <filter-name>helloFilter</filter-name>
        <url-pattern>/*</url-pattern>
        <dispatcher>REQUEST</dispatcher>
        <!--default is REQUEST-->
</filter-mapping>

The dispatcher has four legal values: FORWARD, REQUEST, INCLUDE, and ERROR. A value of FORWARD means the Filter will be applied under RequestDispatcher.forward() calls. A value of REQUEST means the Filter will be applied under ordinary client calls to the path or servlet. A value of INCLUDE means the Filter will be applied under RequestDispatcher.include() calls. A value of ERROR means the Filter will be applied under the error page mechanism. The absence of any dispatcher elements in a filter-mapping indicates a default of applying filters only under ordinary client calls to the path or servlet.

1. ContextLoadListener的作用:①创建IOC容器对象;②将其放入application域对象中.
2. Thread.currentThread().getStackTrace() 找到当前代码的调用路径