SpringMVC拦截器运行原理及配置详解

 public class MyInterceptor implements HandlerInterceptor {

/**
 * 预处理方法：controller方法执行前
 *return true 放行，执行下一个拦截器，如果没有，就执行controller中的方法
 *return: false 不放行
 * @param request
 * @param response
 * @param handler
 * @return
 * @throws Exception
 */
@Override
public boolean preHandle(HttpServletRequest request,
             HttpServletResponse response,
             Object handler) throws Exception {
  System.out.println("执行前......testInterceptor....");
  return true;
}

/**
 * 后处理方法，controller方法执行后，success.jsp执行之前
 *
 *
 * @param request
 * @param response
 * @param handler
 * @param modelAndView
 * @throws Exception
 */
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
  System.out.println("执行后......testInterceptor....");
}


/**
 *
 *success.jsp页面执行后，该方法会执行
 *
 *
 * @param request
 * @param response
 * @param handler
 * @param ex
 * @throws Exception
 */
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
  System.out.println("success.jsp执行后...");
   }
 }