首先回忆一下springmvc中拦截器的使用：

1.定义一个类 implements HandlerInterceptor,实现HandlerInterceptor接口中的方法

　　preHandler               1

　　postHandler              2

　　afterCompletion        3

2.配置拦截器 springmvc.xml

springboot 中不建议使用xml文件，在使用拦截器的时候springboot框架自动配置

springboot中定义和使用拦截器如下：

1.开发自定义拦截器类

拦截器类 implements HandlerInterceptor

public class MyInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        System.out.println("=======1=======");        return true;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("========2========");    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("==========3========");    }}

 

2.配置拦截器，springboot自动配置（@Configuration）

@Configurationpublic class MyWebConfig extends WebMvcConfigurerAdapter {    @Override    public void addInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(new MyInterceptor())                .addPathPatterns("/user/test")       //拦截项目中的哪些请求                .excludePathPatterns("/user/save");  //对项目中的哪些请求不拦截    }}