原码：

public interface HandlerInterceptor {

boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

        throws Exception;

void postHandle(

            HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)

            throws Exception;

void afterCompletion(

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

            throws Exception;

}

使用方法如：

public class ActionLogHandlerInterceptor implements HandlerInterceptor {

public boolean preHandle(HttpServletRequest request,

            HttpServletResponse response, Object handler) throws Exception {

       

　　　log.debug("==============执行顺序: 1、preHandle================");   

　　return true;

}

 

@Override

    public void postHandle(HttpServletRequest request,

            HttpServletResponse response, Object handler,

            ModelAndView modelAndView) throws Exception {

        log.debug("==============执行顺序: 2、postHandle================");

    }

    @Override

    public void afterCompletion(HttpServletRequest request,

            HttpServletResponse response, Object handler, Exception ex)

            throws Exception {

        log.debug("==============执行顺序: 3、afterCompletion================");

    }

}