public class UserIdThreadLocal {

    private static final ThreadLocal<Long>LOCAL=new ThreadLocal<>();

    private UserIdThreadLocal(){}

    /**

     * 将对象放入到ThreadLocal

     *

     * @param userId

     */

    public static void set(Long userId){

        LOCAL.set(userId);

    }

    /**

     * 返回当前线程中的userId

     *

     * @return

     */

    public static Long get(){

        return LOCAL.get();

    }

    /**

     * 删除当前线程中的userId

     */

    public static void remove(){

        LOCAL.remove();

    }

}