package cn.xbz;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;
/**
* @title 各种日期/时间对象转时间戳
* @author Xingbz
* @createDate 2018-5-18
*/
public class DateTime2MillisDemo {
private static final String FORMAT_STR = "yyyy-MM-dd HH:mm:ss";
public static void main(String[] args) {
System.out.println("====== JDK7及之前 ======");
Long l1 = getMillis1();
Long l2 = date2Millis(new Date());
Long l3 = calendar2Millis(Calendar.getInstance());
Long l4 = string2Millis(new SimpleDateFormat(FORMAT_STR).format(new Date()) , FORMAT_STR);//为了与以上几个保持一致
System.out.println(l1 + "\n" + l2 + "\n" + l3 + "\n" + l4);//会有几毫秒的差别
System.out.println("====== JDK8 ======");
Long l5 = getMillis2();
Long l6 = localDateTime2Millis(LocalDateTime.now());
Long l7 = localDate2Millis(LocalDate.now());
Long l8 = clock2Millis(Clock.systemUTC());
Long l9 = zoneDateTime2Millis(ZonedDateTime.now());
Long l10 = string2MillisWithJDK8(LocalDateTime.now().format(DateTimeFormatter.ofPattern(FORMAT_STR)) , FORMAT_STR);//为了与以上几个保持一致
System.out.println(l5 + "\n" + l6 + "\n" + l7 + "\n" + l8 + "\n" + l9 + "\n" + l10);//会有几毫秒的差别
}
/* JDK7及之前 */
/** 获取时间戳 */
public static Long getMillis1() {
return System.currentTimeMillis();
}
/** Date转时间戳 */
public static Long date2Millis(Date date) {
return date.getTime();
}
/** Calendar转时间戳 */
public static Long calendar2Millis(Calendar calendar) {
return calendar.getTime().getTime();
}
/** 日期字符串转时间戳 */
public static Long string2Millis(String dateStr, String formatStr) {
try {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(formatStr);
return simpleDateFormat.parse(dateStr).getTime();
} catch (Exception e) {
return 0L;
}
}
/* JDK8 */
/** 获取时间戳 */
public static Long getMillis2() {
return Instant.now().toEpochMilli();
}
/** LocalDateTime转时间戳 */
public static Long localDateTime2Millis(LocalDateTime localDateTime) {
return localDateTime.toInstant(ZoneOffset.ofHours(8)).toEpochMilli();
}
/** LocalDate转时间戳 */
public static Long localDate2Millis(LocalDate localDate) {
return LocalDateTime.of(localDate, LocalTime.MIN).toInstant(ZoneOffset.ofHours(8)).toEpochMilli();
}
/** Clock转时间戳 */
public static Long clock2Millis(Clock clock) {
return clock.millis();
}
/** ZoneDateTIme转时间戳(这个不常用吧~) */
public static Long zoneDateTime2Millis(ZonedDateTime zonedDateTime) {
return zonedDateTime.toLocalDateTime().toInstant(ZoneOffset.ofHours(8)).toEpochMilli();//!!!好费劲
}
/** String转时间戳(JDK8) */
public static Long string2MillisWithJDK8(String dateStr , String formatStr) {
return LocalDateTime.parse(dateStr , DateTimeFormatter.ofPattern(formatStr)).toInstant(ZoneOffset.ofHours(8)).toEpochMilli();
}
}
输出如下 :
