import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
public class TestInterceptor implements HandlerInterceptor {
 /**
  * 返回值说明是否需要将当前的请求拦截下来
  * false：请求将被终止
  * true：请求会被继续运行
  * Object handler 表示的是被拦截的请求的目标对象
  */
 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
   throws Exception {
  System.out.println("TestInterceptor.preHandle()");
  return true;
 }
 /**
  * modelAndView：
  *  可以通过modelAndView参数改变显示的视图，或者修改发往视图的方法
  */
 @Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
   ModelAndView modelAndView) throws Exception {
  System.out.println("TestInterceptor.postHandle()"); 
 }
 /**
  * 在视图加载完毕之后调用
  * 常用于作于资源的销毁，流等
  * 类似于析构函数
  */
 @Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
   throws Exception {
  System.out.println("TestInterceptor.afterCompletion()"); 
 }
}

<!-- 注册拦截器 -->
 <mvc:interceptors>
 <!-- 单个拦截器:设置具体的拦截路径 -->
 <mvc:interceptor>
  <mvc:mapping path="/courses/view2/*">
  <bean class="com.cc.mvcdemo.interceptor.TestInterceptor"></bean>
 </mvc:mapping></mvc:interceptor>
 <!-- 第二种方式：拦截经过当前Dispatcherservlet的所有请求 -->
 <bean class="com.cc.mvcdemo.interceptor.TestInterceptorTwo"></bean>
 </mvc:interceptors>