根据前端传的时间查询数据

后端：

实体：AppointmentDto中的 startDate、endDate

/**
 * 开始时间
 */
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime startDate;
/**
 * 结束时间
 */
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime endDate;

appointmentDto作为实体类对象

if (appointmentDto.getStartDate() != null || appointmentDto.getEndDate() != null) {
    QueryWrapper<Appointment> queryWrapper = new QueryWrapper<>();
    queryWrapper.ge("appointment_time", appointmentDto.getStartDate());
    queryWrapper.le("appointment_time", appointmentDto.getEndDate());
}