1. 创建一个SpringBoot Web项目

server.port=9013
server.servlet.context-path=/013-springboot-interceptor

2. 实现一个登录拦截器

 

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("------preHandle-----");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

​​​​​​​​​​​​​​3. 通过配置类注册拦截器

在项目中创建一个config包，创建一个配置类InterceptorConfig，并实现WebMvcConfigurer接口， 覆盖接口中的addInterceptors方法，并为该配置类添加@Configuration注解，标注此类为一个配置类，让Spring Boot 扫描到，这里的操作就相当于SpringMVC的注册拦截器 ，@Configuration就相当于一个applicationContext-mvc.xml

配置类等同于.xml配置

@Configuration //注册一个拦截器,相当于applicationContext-mvc.xml配置
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //定义需要拦截的路径
        String[] addPathPatterns = {
                "/springBoot/**"
        };

        //定义不需要拦截的路径
        String[] excludePathPatterns = {
                "/springBoot/login",
                "/springBoot/register"
        };

        //链式编程
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns(addPathPatterns).excludePathPatterns(excludePathPatterns);

    }
}

4. ​​​​​​​​​​​​​​浏览器访问测试是否拦截成功