在spring boot应用2.0中使用会话超时消息向用户发出警告

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class SessionTimeoutListener implements HttpSessionListener {

    @Override
    public void sessionDestroyed(HttpSessionEvent event) {
        // 获取当前会话的用户ID
        String userId = (String) event.getSession().getAttribute("userId");
        
        // 发送会话超时警告消息
        sendMessage(userId, "Your session is about to timeout. Please refresh the page.");
    }
    
    private void sendMessage(String userId, String message) {
        // 使用消息队列或WebSocket等方式发送消息给用户
        // TODO: 实现发送消息的逻辑
    }
}

import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SessionTimeoutConfig {

    @Bean
    public ServletListenerRegistrationBean<SessionTimeoutListener> sessionTimeoutListener() {
        ServletListenerRegistrationBean<SessionTimeoutListener> listenerRegistrationBean =
                new ServletListenerRegistrationBean<>();
        listenerRegistrationBean.setListener(new SessionTimeoutListener());
        return listenerRegistrationBean;
    }
}