Interceptor(拦截器) 类似于Filter(过滤器),都是AOP思想的体现，能够实现日志，过滤等处理.
1.拦截器的实现: 方法一: ①导入spring相关的包，实现HandlerInterceptor接口. ②在springmvc.xml中注册Interceptor(注意拦截的mapping要写在拦截器bean之前，不然xml一直报错)
Interceptor1.java
package com.wantao.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import lombok.extern.slf4j.Slf4j; /** * @author wantao * @date 2019-05-23 4:28:29 PM * @description talk is cheap,show me your code */ @Slf4j public class Interceptor1 implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { log.info("interceptor1 preHandle"); return true;//这里如果不return true则不会执行其余两个方法 } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { log.info("interceptor1 postHandle"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { log.info("interceptor1 afterCompletion"); } } ```xml <font color="red">springmvc.xml</font> ```<context:component-scan base-package="com.wantao.controller"></context:component-scan> <mvc:interceptors> <mvc:interceptor> <!-- 这里注意一定要先定义mapping再定义bean --> <mvc:mapping path="/hello" /> <mvc:exclude-mapping path="/hello1"/> <bean class="com.wantao.interceptor.Interceptor1" /> </mvc:interceptor> <mvc:interceptor> <!-- 这里注意一定要先定义mapping再定义bean,不然xml文件一直报错--> <mvc:mapping path="/hello" /> <mvc:exclude-mapping path="/hello1"/> <!--排除不要拦截的路径--> <bean class="com.wantao.interceptor.Interceptor2" /> </mvc:interceptor> </mvc:interceptors>方法二(Springboot): ①导入spring相关的包，实现HandlerInterceptor接口. ②配置类实现WebMvcConfigurerAdapter接口
2.拦截器的拦截过程
3.Interceptor和Filter的一些区别(https://blog.csdn.net/qq_34971162/article/details/80969836)
