在調用控制器之前或之后會調用攔截器 1.preHandle 在調用控制器之前 2.postHandle 在調用控制器之后 3.afterCompletion 在視圖渲染結束后 **1.自定義攔截器** ~~~ package com.nobb.controller.interceptor; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //自定義的攔截器，需要繼承 HandlerInterceptor public class MyInterceptor implements HandlerInterceptor { @Override //執行Controller方法之前調用 // 可以通過返回值,選擇是否阻止Controller方法調用 // true:不阻止 false:阻止 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("public boolean preHandle!"); return true; } @Override //執行Controller方法之后調用 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("public void postHandle!"); } @Override //視圖渲染結束后調用 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("public void afterCompletion"); } } ~~~ **2.spring-mvc.xml 配置攔截器** ~~~ <!--指定包及子包的文件，交給了spring管理--> <context:component-scan base-package="com.nobb.controller"/> <!--啟用注解配置SpringMVC--> <mvc:annotation-driven/> <mvc:interceptors> <mvc:interceptor> <!--攔截hello下的所有路徑--> <mvc:mapping path="/hello/**"/> <bean class="com.nobb.controller.interceptor.MyInterceptor"/> </mvc:interceptor> </mvc:interceptors> ~~~