Java使用ThreadLocal实现当前登录信息的存取功能

public class BaseContext {
    private static ThreadLocal<Long> threadLocal = new ThreadLocal<>();

    public static void setCurrentId(Long id){
        threadLocal.set(id);
    }

    public static Long getCurrentId(){
        return threadLocal.get();
    }
}

  //4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId =  (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

 @Override
    public void insertFill(MetaObject metaObject) {
        log.info("公共字段自动填充[insert]...");
        log.info(metaObject.toString());
        metaObject.setValue("createTime", LocalDateTime.now());
        metaObject.setValue("updateTime",LocalDateTime.now());
        metaObject.setValue("createUser",BaseContext.getCurrentId());
        metaObject.setValue("updateUser",BaseContext.getCurrentId());
    }