Java 8 日期时间 API 使用示例

public class DateAPI {
    static final String SEP = "#################################################################";

    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss:SSS");
        // 获取当前的日期时间
        LocalDateTime currentTime = LocalDateTime.now();
        currentTimeOpt(currentTime);
        System.out.println(SEP);

        transDateTime(currentTime);
        System.out.println(SEP);

        zoneDateTime();
        System.out.println(SEP);

        System.out.println("format date: " + LocalDateTime.now().format(formatter));
    }

    public static void dateStr2Date() {
        // 获得当前时间
        LocalDateTime ldt = LocalDateTime.now();
        System.out.println(ldt);
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH:mm:ss");
        String format = ldt.format(dtf);
        System.out.println(format);

        String str1="2019-11-13 11:11:29";
        DateTimeFormatter dtf1 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime parse = LocalDateTime.parse(str1, dtf1);
        System.out.println(parse);
    }

    /**
     * currentTime operate
     * */
    public static void currentTimeOpt(LocalDateTime currentTime) {
        System.out.println("current time is: " + currentTime);

        System.out.println("current date: " + currentTime.toLocalDate());
        System.out.println("current time: " + currentTime.toLocalTime());

        System.out.println("current year: " + currentTime.getYear());
        System.out.println("current month: " + currentTime.getMonth());
        System.out.println("current month value: " + currentTime.getMonthValue());
        System.out.println("current day: " + currentTime.getDayOfMonth());

        System.out.println("current hour: " + currentTime.getHour());
        System.out.println("current minute: " + currentTime.getMinute());
        System.out.println("current second: " + currentTime.getSecond());

        System.out.println("current day of year: " + currentTime.getDayOfYear());
        System.out.println("current day of week: " + currentTime.getDayOfWeek());
    }

    public static void transDateTime(LocalDateTime currentTime) {
        LocalDateTime localDateTime = currentTime.withDayOfMonth(10).withYear(2012);
        System.out.println(currentTime + " -> " + localDateTime);

        LocalDate localDate = LocalDate.of(2018, Month.DECEMBER, 12);
        System.out.println(localDate);
        // 加12个月
        System.out.println(localDate.plusMonths(12));
        // 减1个月
        System.out.println(localDate.plusMonths(-1));
        localDate = LocalDate.of(2018, 12, 12);
        System.out.println(localDate);
        localDate = LocalDate.parse("2018-01-01");
        System.out.println(localDate);

        LocalTime localTime = LocalTime.of(18, 30, 01);
        System.out.println(localTime);

        localTime = LocalTime.parse("20:13:14");
        System.out.println(localTime);
    }

    public static void zoneDateTime() {
        // 获取当前时间日期
        ZonedDateTime zonedDateTime = ZonedDateTime.parse("2015-12-03T10:15:30+05:30[Asia/Shanghai]");
        System.out.println("zonedDateTime: " + zonedDateTime);

        ZoneId zoneId = ZoneId.of("Europe/Paris");
        System.out.println("ZoneId: " + zoneId);

        ZoneId currentZone = ZoneId.systemDefault();
        System.out.println("当期时区: " + currentZone);
    }

}