Java 时间格式化工具类
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalQuery;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
public enum DateTimeUtils {
/** 日期格式 <code>[yyyy-MM-dd]</code> */
DATE("yyyy-MM-dd"),
/** 日期格式 <code>[yyyyMMdd]</code> */
DATE_COMPACT("yyyyMMdd"),
/** 日期格式 <code>[yyyy_MM_dd]</code> */
DATE_UNDERLINE("yyyy_MM_dd"),
/** 时间格式 <code>[HH:mm:ss]</code> */
TIME("HH:mm:ss"),
/** 时间格式 <code>[HHmmss]</code> */
TIME_COMPACT("HHmmss"),
/** 时间格式 <code>[HH_mm_ss]</code> */
TIME_UNDERLINE("HH_mm_ss"),
/** 时间格式 <code>[HH:mm:ss.SSS]</code> */
TIME_MILLI("HH:mm:ss.SSS"),
/** 时间格式 <code>[HHmmssSSS]</code> */
TIME_MILLI_COMPACT("HHmmssSSS"),
/** 时间格式 <code>[HH_mm_ss_SSS]</code> */
TIME_MILLI_UNDERLINE("HH_mm_ss_SSS"),
/** 日期时间格式 <code>[yyyy-MM-dd HH:mm:ss]</code> */
DATE_TIME("yyyy-MM-dd HH:mm:ss"),
/** 日期时间格式 <code>[yyyyMMddHHmmss]</code> */
DATE_TIME_COMPACT("yyyyMMddHHmmss"),
/** 日期时间格式 <code>[yyyy_MM_dd_HH_mm_ss]</code> */
DATE_TIME_UNDERLINE("yyyy_MM_dd_HH_mm_ss"),
/** 日期时间格式 <code>[yyyy-MM-dd HH:mm:ss.SSS]</code> */
DATE_TIME_MILLI("yyyy-MM-dd HH:mm:ss.SSS"),
/** 日期时间格式 <code>[yyyyMMddHHmmssSSS]</code> */
DATE_TIME_MILLI_COMPACT("yyyyMMddHHmmssSSS"),
/** 日期时间格式 <code>[yyyy_MM_dd_HH_mm_ss_SSS]</code> */
DATE_TIME_MILLI_UNDERLINE("yyyy_MM_dd_HH_mm_ss_SSS");
// --------------------------------------------------------------------------------------------
private final DateTimeFormatter formatter;
private DateTimeUtils(String pattern) {
this.formatter = DateTimeFormatter.ofPattern(pattern).withZone(ZoneId.systemDefault());
}
private static class CacheHolder {
private static final int CAPACITY = 8;
private static final Map<String, DateTimeFormatter> CACHE =
new LinkedHashMap<String, DateTimeFormatter>(CAPACITY, 1F, true) {
private static final long serialVersionUID = -2972235912618490882L;
@Override
protected boolean removeEldestEntry(Map.Entry<String, DateTimeFormatter> eldest) {
return size() >= (CAPACITY - 1);
}
};
}
// --------------------------------------------------------------------------------------------
/**
* Formats a date-time object using this formatter.
*
* @param temporal the temporal object to format, not null
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String format(TemporalAccessor temporal) {
return formatter.format(temporal);
}
/**
* Formats a date-time object using this formatter.
*
* @param date the date object to format, not null
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String formatDate(Date date) {
return formatter.format(date.toInstant());
}
/**
* Formats a date-time object using this formatter.
*
* @param epochSecond the epoch seconds to format, not null
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String formatEpochSecond(long epochSecond) {
return formatter.format(Instant.ofEpochSecond(epochSecond));
}
/**
* Formats a date-time object using this formatter.
*
* @param epochMilli the epoch milliseconds to format, not null
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String formatEpochMilli(long epochMilli) {
return formatter.format(Instant.ofEpochMilli(epochMilli));
}
/**
* Formats a date-time object using this formatter.
*
* @return the formatted string, not null
* @throws DateTimeException if an error occurs during formatting
*/
public String now() {
return formatter.format(Instant.now());
}
// --------------------------------------------------------------------------------------------
/**
* Fully parses the text producing an object of the specified type.
*
* @param date the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed date-time, not null
* @throws DateTimeParseException if unable to parse the requested result
*/
public <R> R parse(String date, TemporalQuery<R> query) {
return formatter.parse(date, query);
}
/**
* Fully parses the text producing an object of the specified type.
*
* @param date the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed date-time, not null
* @throws DateTimeException if unable to parse the requested result
*/
public <R> Instant parseInstant(String date, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof Instant) {
return (Instant) temporal;
}
if (temporal instanceof LocalDateTime) {
return ((LocalDateTime) temporal).atZone(ZoneId.systemDefault()).toInstant();
}
if (temporal instanceof LocalDate) {
return ((LocalDate) temporal).atStartOfDay(ZoneId.systemDefault()).toInstant();
}
if (temporal instanceof LocalTime) {
LocalDate epoch = LocalDate.of(1970, 1, 1); // or LocalDate.now() ???
LocalDateTime datetime = LocalDateTime.of(epoch, (LocalTime) temporal);
return datetime.atZone(ZoneId.systemDefault()).toInstant();
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate or LocalTime or Instant ");
}
/**
* Fully parses the text producing an object of the specified type.
*
* @param date the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed date-time, not null
* @throws DateTimeException if unable to parse the requested result
*/
public <R> Date parseDate(String date, TemporalQuery<R> query) {
return Date.from(parseInstant(date, query));
}
/**
* Fully parses the text producing an object of the specified type.
*
* @param date the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed time-stamp
* @throws DateTimeException if unable to parse the requested result
*/
public <R> long parseEpochSecond(String date, TemporalQuery<R> query) {
return parseInstant(date, query).getEpochSecond();
}
/**
* Fully parses the text producing an object of the specified type.
*
* @param date the text to parse, not null
* @param query the query defining the type to parse to, not null
* @return the parsed time-stamp
* @throws DateTimeException if unable to parse the requested result
*/
public <R> long parseEpochMilli(String date, TemporalQuery<R> query) {
return parseInstant(date, query).toEpochMilli();
}
// --------------------------------------------------------------------------------------------
/**
* Returns a copy of this <tt>date</tt> with the specified number of years added.
*
* @param date date of the String type
* @param years the years to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusYears(String date, long years, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusYears(years));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).plusYears(years));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of months added.
*
* @param date date of the String type
* @param months the months to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusMonths(String date, long months, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusMonths(months));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).plusMonths(months));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of weeks added.
*
* @param date date of the String type
* @param weeks the weeks to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusWeeks(String date, long weeks, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusWeeks(weeks));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).plusWeeks(weeks));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of days added.
*
* @param date date of the String type
* @param days the days to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusDays(String date, long days, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusDays(days));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).plusDays(days));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of hours added.
*
* @param date date of the String type
* @param hours the hours to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusHours(String date, long hours, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusHours(hours));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).plusHours(hours));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of minutes added.
*
* @param date date of the String type
* @param minutes the minutes to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusMinutes(String date, long minutes, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusMinutes(minutes));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).plusMinutes(minutes));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of seconds added.
*
* @param date date of the String type
* @param seconds the seconds to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusSeconds(String date, long seconds, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusSeconds(seconds));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).plusSeconds(seconds));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of milliseconds added.
*
* @param date date of the String type
* @param milliseconds the milliseconds to add, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String plusMilliseconds(String date, long milliseconds, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).plusNanos(milliseconds * 1000000L));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).plusNanos(milliseconds * 1000000L));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
// --------------------------------------------------------------------------------------------
/**
* Returns a copy of this <tt>date</tt> with the specified number of years subtracted.
*
* @param date date of the String type
* @param years the years to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusYears(String date, long years, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusYears(years));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).minusYears(years));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of months subtracted.
*
* @param date date of the String type
* @param months the months to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusMonths(String date, long months, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusMonths(months));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).minusMonths(months));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of weeks subtracted.
*
* @param date date of the String type
* @param weeks the weeks to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusWeeks(String date, long weeks, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusWeeks(weeks));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).minusWeeks(weeks));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of days subtracted.
*
* @param date date of the String type
* @param days the days to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusDays(String date, long days, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusDays(days));
}
if (temporal instanceof LocalDate) {
return formatter.format(((LocalDate) temporal).minusDays(days));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalDate ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of hours subtracted.
*
* @param date date of the String type
* @param hours the hours to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusHours(String date, long hours, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusHours(hours));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).minusHours(hours));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of minutes subtracted.
*
* @param date date of the String type
* @param minutes the minutes to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusMinutes(String date, long minutes, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusMinutes(minutes));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).minusMinutes(minutes));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of seconds subtracted.
*
* @param date date of the String type
* @param seconds the seconds to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusSeconds(String date, long seconds, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusSeconds(seconds));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).minusSeconds(seconds));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
/**
* Returns a copy of this <tt>date</tt> with the specified number of milliseconds subtracted.
*
* @param date date of the String type
* @param milliseconds the milliseconds to subtract, may be negative
* @param query the query defining the type to parse to, not null
* @return based on this date-time with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
public <R> String minusMilliseconds(String date, long milliseconds, TemporalQuery<R> query) {
R temporal = parse(date, query);
if (temporal instanceof LocalDateTime) {
return formatter.format(((LocalDateTime) temporal).minusNanos(milliseconds * 1000000L));
}
if (temporal instanceof LocalTime) {
return formatter.format(((LocalTime) temporal).minusNanos(milliseconds * 1000000L));
}
throw new DateTimeException(" Type parameter must be LocalDateTime or LocalTime ");
}
// --------------------------------------------------------------------------------------------
/**
* Change the format of the date display
*
* @param date date of the String type
* @param pattern the format of the date display
* @param query the query defining the type to parse to, not null
* @return
* @throws DateTimeException if unable to parse the requested result
*/
public String transform(String date, String pattern, TemporalQuery<?> query) {
synchronized (CacheHolder.CACHE) {
if (CacheHolder.CACHE.containsKey(pattern)) {
return CacheHolder.CACHE.get(pattern).format((TemporalAccessor) formatter.parse(date, query));
}
DateTimeFormatter dtf = DateTimeFormatter.ofPattern(pattern).withZone(ZoneId.systemDefault());
String result = dtf.format((TemporalAccessor) formatter.parse(date, query));
if (pattern.length() == result.length()) {
CacheHolder.CACHE.putIfAbsent(pattern, dtf);
}
return result;
}
}
}
