拦截器interceptor
作者:互联网
拦截器interceptor
配置
<mvc:interceptors> <mvc:interceptor> <!--/**回处理/后面的所有请求--> <mvc:mapping path="/**"/> <bean class="cn.pinked.config.MyInterceptor"/> </mvc:interceptor> </mvc:interceptors>
拦截器
public class MyInterceptor implements HandlerInterceptor { //return true; 执行下一个拦截器 //return false; 不执行下一个拦截器 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("==========preHandle=========="); return true; } public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("==========postHandle=========="); } public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("==========afterCompletion=========="); } }
输出
==========preHandle========== controller===test()执行 ==========postHandle========== ==========afterCompletion==========
总结
preHandle
调用时间:Controller方法处理之前
若返回false,则中断执行,注意:不会进入afterCompletionpostHandle
调用前提:preHandle返回true
调用时间:Controller方法处理完之后,DispatcherServlet进行视图的渲染之前,也就是说在这个方法中你可以对ModelAndView进行操作
备注:postHandle虽然post打头,但post、get方法都能处理afterCompletion
调用前提:preHandle返回true
调用时间:DispatcherServlet进行视图的渲染之后
多用于清理资源
标签:Exception,拦截器,preHandle,postHandle,interceptor,public,afterCompletion 来源: https://www.cnblogs.com/pinked/p/12234515.html