将毫秒值(currentTimeMillis)转换为(年-月-日 时-分-秒)的形式,只需一行代码
//首先获取当前的毫秒值
long currentTimeMillis = System.currentTimeMillis();
/**
* 转换为年月日时分秒的形式,得到的currentTime就是转换之后的值了
* yyyy-MM-dd HH-mm-ss
* 年-月-日 时-分-秒
*/
String currentTime = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss").format(currentTimeMillis);如果说你只想要"时-分-秒"
String currentTime = new SimpleDateFormat("HH-mm-ss").format(currentTimeMillis);计算获得时间戳后转时分秒格式，附实验结果
/**
* @Author： Be.insighted
* Description：
* @date Create on 2020/7/14 16:35
**/
public class TimeUtils{
/**
* 把时间戳转换为：时分秒
*
* @param millisecond ：毫秒，传入单位为毫秒
*/
public static String getTimeString(final long millisecond) {
if (millisecond < 1000) {
return "0" + "秒";
}
long second = millisecond / 1000;
long seconds = second % 60;
long minutes = second / 60;
long hours = 0;
if (minutes >= 60) {
hours = minutes / 60;
minutes = minutes % 60;
}
String timeString = "";
String secondString = "";
String minuteString = "";
String hourString = "";
if (seconds < 10) {
secondString = "0" + seconds + "秒";
} else {
secondString = seconds + "秒";
}
if (minutes < 10 && hours < 1) {
minuteString = minutes + "分";
} else if (minutes < 10){
minuteString = "0" + minutes + "分";
} else {
minuteString = minutes + "分";
}
if (hours < 10) {
hourString = hours + "时";
} else {
hourString = hours + "" + "时";
}
if (hours != 0) {
timeString = hourString + minuteString + secondString;
} else {
timeString = minuteString + secondString;
}
return timeString;
}
public static Date convertTimeStamp2Date(long timeStamp) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date(timeStamp);
try {
date = df.parse(df.format(date));
} catch (ParseException e) {
log.error("时间格式化错误");
}
return date;
}
public static long dateToStamp(Date date, int hour, int minute, int second) {
LocalDateTime timestamp = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
return timestamp.withHour(hour).withMinute(minute).withSecond(second).atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
}实验结果
时间工具类
public class DateTimeUtils {
public static final String DATE_FORMAT_DATETIME_SIMPLE = "yyMMddHHmmss";
/**
* 年-月-日
*/
public static final String DATE_FORMAT_DATEONLY = "yyyy-MM-dd";
/**
* 年-月-日
*/
public static final String DATE_FORMAT_DATEONLY_MONTH = "yyyyMM";
/**
* 年-月-日 时分秒
*/
public static final String DATETIME_FORMAT_DATEONLY = "yyyy-MM-dd HH:mm:ss";
/**
* 年-月-日 时分
*/
public static final String DATE_FORMAT_DATE = "yyyy-MM-dd HH:mm";
/**
* dateTime formatter
*/
public static final DateTimeFormatter DATETIME_FORMATTER = DateTimeFormatter.ofPattern(DATETIME_FORMAT_DATEONLY);
/**
* date formatter
*/
public static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern(DATE_FORMAT_DATEONLY);
private static final ZoneId ZONE = ZoneId.systemDefault();
public static String formatDateTimeString(long unixTime, String format) {
if (unixTime == 0) {
return "";
}
LocalDateTime dateTime = toLocalDateTime(unixTime);
Date date = date(dateTime);
SimpleDateFormat formator = new SimpleDateFormat(format);
return formator.format(date);
}
public static String formatDateTimeString(long unixTime) {
return formatDateTimeString(unixTime, DATETIME_FORMAT_DATEONLY);
}
/**
* 毫秒转为分
*
* @param second
* @return
*/
public static String getGapTime(long second) {
if (second != 0L) {
second = second / 1000;
}
//转换天数
long days = second / 86400;
//剩余秒数
second = second % 86400;
//转换小时数
long hours = second / 3600;
//剩余秒数
second = second % 3600;
//转换分钟
long minutes = second / 60;
//剩余秒数
second = second % 60;
String s = days + "天" + hours + "时" + minutes + "分" + second + "秒";
if (0 < days) {
return s;
} else {
return hours + "时" + minutes + "分" + second + "秒";
}
}
/**
* 获取String类型时间
*
* @return
*/
public static String convertCalender2String() {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmm");
Calendar calendar = Calendar.getInstance();
return df.format(calendar.getTime());
}
/**
* java.time.LocalDateTime --> java.util.Date
*
* @param localDateTime
* @return
*/
public static Date date(LocalDateTime localDateTime) {
if (localDateTime == null) {
return null;
}
Instant instant = localDateTime.atZone(ZONE).toInstant();
return Date.from(instant);
}
/**
* 将字符串转换成日期，只到年月日
* @param str
* @return
*/
public static Date strToDate(String str, String format) {
try {
if (StringUtils.isBlank(format)) {
format = DATETIME_FORMAT_DATEONLY;
}
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
return simpleDateFormat.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 将Date日期转换成String
*
* @param dateDate
* @return
*/
public static String dateToStr(Date dateDate, String formatter) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(formatter);
String dateString = simpleDateFormat.format(dateDate);
return dateString;
}
/**
* 将Date日期转换成String
*
* @param dateDate
* @return
*/
public static String dateToStr(Date dateDate) {
SimpleDateFormat formatter = new SimpleDateFormat(DATE_FORMAT_DATEONLY);
String dateString = formatter.format(dateDate);
return dateString;
}
public static LocalDateTime toLocalDateTime(Date date){
Instant instant = date.toInstant();
ZoneId zone = ZoneId.systemDefault();
return LocalDateTime.ofInstant(instant, zone);
}
public static LocalDateTime toLocalDateTime(long dateLong){
return toLocalDateTime(new Date(dateLong));
}
public static Date toDate(LocalDateTime localDateTime){
return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
}
public static Date toDate(LocalDate localDate){
return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
}
public static Date toDate(LocalTime localTime) {
LocalDate localDate = LocalDate.now();
LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
ZoneId zone = ZoneId.systemDefault();
Instant instant = localDateTime.atZone(zone).toInstant();
return Date.from(instant);
}
public static long toLong(LocalDateTime localDateTime){
return localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
public static long toLong(LocalTime localTime){
LocalDate localDate = LocalDate.now();
LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
return localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
public static long toLong(LocalDate localDate){
LocalDateTime localDateTime = localDate.atStartOfDay();
return localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
public static boolean isToday(LocalDateTime datetime) {
LocalDateTime now = LocalDateTime.now();
return (now.getYear() == datetime.getYear()) && (now.getMonthValue() == datetime.getMonthValue()) && (now.getDayOfMonth() == datetime.getDayOfMonth());
}
}参考文章：https://blog.csdn.net/Be_insighted/article/details/107341664
