如何使用 springmvc 拦截器

public class MyFilter implements HandlerInterceptor {

    /**
     * 生成视图之后执行
     */
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object obj, Exception e)
            throws Exception {
        System.out.println("视图已生成。。。");  
    }

    /**
     * 动作交互之后，生成视图之前拦截
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
            Object obj, ModelAndView mav) throws Exception {
        System.out.println("动作交互之后，生成视图之前。。。");
    }

    /**
     * 动作交互之前拦截
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object obj) throws Exception {
        System.out.println("动作交互之前拦截。。。");
        return true;
    }
}

<!-- 全局拦截器 -->
<mvc:interceptors>
　　<bean class="com.erim.web.common.MyFilter" />
</mvc:interceptors>