Java 8 LocalDateTime 简单使用

LocalTime : 只包括时间

LocalDate : 只包括日期

LocalDateTime ： 包括日期和时间

JDBC映射

LocalTime 对应 time

LocalDate 对应 date

LocalDateTime 对应 timestamp

main方法跑起来

public static void main(String[] args) { LocalDateTime time = LocalDateTime.now(); System.out.println(time.toString()); //字符串表示 System.out.println(time.toLocalTime()); //获取时间(LocalTime) System.out.println(time.toLocalDate()); //获取日期(LocalDate) System.out.println(time.getDayOfMonth()); //获取当前时间月份的第几天 System.out.println(time.getDayOfWeek()); //获取当前周的第几天 System.out.println(time.getDayOfYear()); //获取当前时间在该年属于第几天 System.out.println(time.getHour()); System.out.println(time.getMinute()); System.out.println(time.getMonthValue()); System.out.println(time.getMonth()); //格式化输出 DateTimeFormatter formatter = DateTimeFormatter.ofPattern("YYYY/MM/dd HH:mm:ss"); System.out.println(time.format(formatter)); //构造时间 LocalDateTime startTime = LocalDateTime.of(2018, 1, 1, 20, 31, 20); LocalDateTime endTime = LocalDateTime.of(2018, 1, 3, 20, 31, 20); //比较时间 System.out.println(time.isAfter(startTime)); System.out.println(time.isBefore(endTime)); //时间运算，相加相减 System.out.println(time.plusYears(2)); //加2年 System.out.println(time.plusDays(2)); //加两天 System.out.println(time.minusYears(2)); //减两年 System.out.println(time.minusDays(2)); //减两天 //获取毫秒数(使用Instant) System.out.println(time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()); //获取秒数(使用Instant) System.out.println(time.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond()); }

结果：

2020-10-20T16:13:31.947 16:13:31.947 2020-10-20 20 TUESDAY 294 16 13 10 OCTOBER

2020/10/20 16:13:31 true false 2022-10-20T16:13:31.947 2020-10-22T16:13:31.947 2018-10-20T16:13:31.947 2020-10-18T16:13:31.947 1603181611947 1603181611