Spring MVC 拦截器实现代码

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importorg.springframework.web.servlet.HandlerInterceptor;

importorg.springframework.web.servlet.ModelAndView;

publicclassTestInterceptorimplementsHandlerInterceptor {

  /**

   * 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

  publicbooleanpreHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

      throwsException {

    System.out.println("TestInterceptor.preHandle()");

    returntrue;

  }

  /**

   * 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

  publicvoidpostHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

      ModelAndView modelAndView)throwsException {

    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

  publicvoidafterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

      throwsException {

    System.out.println("TestInterceptor.afterCompletion()");  

  }

}