public class UserTokenInterceptor implements HandlerInterceptor {
 
    /**
     * @description 訪問Controller之前執(zhí)行
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("進入攔截器啦、、");
        return true; // true即可放行，false則不放行
    }
 
    /**
     * @description 請求訪問Controller之后，渲染視圖之前
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
 
    }
 
    /**
     * @description 請求訪問Controller之后，渲染視圖之后
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
 
    }
}

2、配置Web攔截器(WebMvcConfig)并實現(xiàn)Spring的WebMvcConfigurer接口

在Spring Boot 1.5版本都是靠重寫WebMvcConfigurerAdapter的方法來添加自定義攔截器，消息轉(zhuǎn)換器等。SpringBoot 2.0 后，該類被標記為@Deprecated（棄用）。官方推薦直接實現(xiàn)WebMvcConfigurer或者直接繼承WebMvcConfigurationSupport，方式一實現(xiàn)WebMvcConfigurer接口（推薦）

復寫addInterceptors方法，添加自己的攔截器

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 注冊攔截器
        registry.addInterceptor(getUserTokenInterceptor()).addPathPatterns("/index/session");
        // 一定要加
        WebMvcConfigurer.super.addInterceptors(registry);
    }
 
 
    //    @Bean
    public UserTokenInterceptor getUserTokenInterceptor() {
        return new UserTokenInterceptor();
    }
 
}

3、編寫測試Controller

@RestController
@RequestMapping("/index")
public class IndexController {
 
    @Deprecated
    @GetMapping("/session")
    public Object getSession(HttpServletRequest request) {
        HttpSession session = request.getSession();
        session.setAttribute("name", "lequal");
        session.setMaxInactiveInterval(3600);
        String name = (String) session.getAttribute("name");
        System.out.println("獲取的名字是：" + name);
        return name;
    }
}

4、訪問URL地址