SpringMVC使用拦截器步骤

applicationContext.xml

<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
  <property name="interceptors">
    <list>
      <bean class="com.interceptor.MyInterceptor" />
    </list>
  </property>
</bean>

interceptor代码:

public class MyInterceptor implements HandlerInterceptor {
  //释放资源
  public void afterCompletion(HttpServletRequest request,
    HttpServletResponse response, Object handler, Exception ex)
      throws Exception {
    System.out.println("MyInterceptor->afterCompletion");
  }
  //控制器执行完成后,生成视图之前执行的动作
  public void postHandle(HttpServletRequest request,
    HttpServletResponse response, Object handler,
      ModelAndView modelAndView) throws Exception {
    System.out.println("MyInterceptor->postHandle");
  }
  //发向控制器之前执行的动作
  public boolean preHandle(HttpServletRequest request,
    HttpServletResponse response, Object handler) throws Exception {
    System.out.println("MyInterceptor->preHandle");
    return true;
  }
}

PS:执行顺序为
MyInterceptor->preHandle
Controller控制器代码
MyInterceptor->postHandle
MyInterceptor->afterCompletion