Springboot 项目一启动就获取HttpSession的两种方法

@Component
public class MySessionListener implements HttpSessionListener {

    @Override
    public void sessionCreated(HttpSessionEvent se) {
        // 当 session 被创建时执行
        System.out.println("Session created: " + se.getSession().getId());
        se.getSession().setAttribute("initData", "some value");
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent se) {
        // 当 session 销毁时执行
    }
}

@Component
public class SessionInitInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        HttpSession session = request.getSession();
        if (session.getAttribute("initData") == null) {
            session.setAttribute("initData", "initialized on first request");
        }
        return true;
    }
}

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    private SessionInitInterceptor sessionInitInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(sessionInitInterceptor);
    }
}