1、创建自定义拦截器类(UserTokenInterceptor)并实现HandlerInterceptor 接口，再重写方法，代码如下：
public class UserTokenInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { log.info("进入拦截器啦、、"); return true; // true即可放行，false则不放行 } @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 { }}
2、配置Web拦截器(WebMvcConfig)并实现Spring的WebMvcConfigurer接口
在Spring Boot 1.5版本都是靠重写WebMvcConfigurerAdapter的方法来添加自定义拦截器，消息转换器等。SpringBoot 2.0 后，该类被标记为@Deprecated（弃用）。官方推荐直接实现WebMvcConfigurer或者直接继承WebMvcConfigurationSupport，方式一实现WebMvcConfigurer接口（推荐）
复写addInterceptors方法，添加自己的拦截器
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configurationpublic class WebMvcConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { // 注册拦截器 registry.addInterceptor(getUserTokenInterceptor()).addPathPatterns("/index/session"); // 一定要加 WebMvcConfigurer.super.addInterceptors(registry); } // @Bean public UserTokenInterceptor getUserTokenInterceptor() { return new UserTokenInterceptor(); }}
3、编写测试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("获取的名字是：" + name); return name; }}
4、访问URL地址
如果preHandle方法中return false的话浏览器访问是看不到返回的内容的，因为被拦截住了，就相当于卡在那里了。