本文实例主要是关于Java8中的新特性，时间日期api的相关实例，具体如下：
package com.effective.common.base.date;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;
/**
* 日期工具类
* @author yanweiqi
* @since 2016-5-6
*
*/
public class LocalDateUtils {
private static ZoneId zone = ZoneId.systemDefault();
/**
* 字符串转Date
* @param date
* @return
* @throws Exception
*/
public static Date convertToDate(String date) throws Exception{
LocalDate localDate = null;
if(null == date){
throw new NullPointerException("date isn't null");
} else {
localDate = LocalDate.parse(date);
return convertToDate(localDate);
}
}
/**
* 字符串转LocalDateTime
* @param date
* @return localDateTime
*/
public static LocalDateTime convertToLocalDateTime(String date){
LocalDateTime localDateTime = null;
if(null == date){
throw new NullPointerException("date isn't null");
} else {
localDateTime = LocalDateTime.parse(date);
return localDateTime;
}
}
/**
* LocalDate转Date
* @param localDate
* @return Date
*/
public static Date convertToDate(LocalDate localDate){
Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
return Date.from(instant);
}
/**
* LocalDate转Date
* @param localDateTime
* @return Date
*/
public static Date convertToDate(LocalDateTime localDateTime){
Instant instant = localDateTime.atZone(zone).toInstant();
return Date.from(instant);
}
/**
* Date转LocalDate
* @param date
* @return localDate
*/
public static LocalDate convertToLocalDate(Date date){
Instant instant = date.toInstant();
return convertToLocalDateTime(instant).toLocalDate();
}
/**
* Date转LocalTime
* @param date
* @return localDate
*/
public static LocalTime convertToLocalTime(Date date){
Instant instant = date.toInstant();
return convertToLocalDateTime(instant).toLocalTime();
}
/**
* Date转LocalDatetime
* @param date
* @return localDate
*/
public static LocalDateTime convertToLocalDateTime(Date date){
Instant instant = date.toInstant();
return convertToLocalDateTime(instant);
}
/**
* Instant转LocalDateTime
* @param instant
* @return
*/
public static LocalDateTime convertToLocalDateTime(Instant instant){
return LocalDateTime.ofInstant(instant, zone);
}
/**
* LocalDateTime转Instant
* @param localDateTime
* @return
*/
public static Instant convertToInstant(LocalDateTime localDateTime){
return localDateTime.atZone(zone).toInstant();
}
/**
* LocalDate转Instant
* @param localDate
* @return
*/
public static Instant convertToInstant(LocalDate localDate){
return localDate.atStartOfDay(zone).toInstant();
}
/**
* LocalDate转LocalDateTime
* @param localDate
* @return LocalDateTime
*/
public static LocalDateTime convertToLocalDateTime(LocalDate localDate){
return localDate.atStartOfDay();
}
/**
* 日周期格式化
* @param localDateTime
* @param formatStyle
* @return
*/
public static String formatter(LocalDateTime localDateTime, String formatStyle){
return DateTimeFormatter.ofPattern(formatStyle).format(localDateTime);
}
/**
* 设置年
* @param sourceDate
* @param year
* @return LocalDateTime
*/
public static LocalDateTime setYear(LocalDateTime sourceDate, Integer year){
return sourceDate.withYear(year);
}
/**
* 设置月
* @param sourceDate
* @param month
* @return LocalDateTime
*/
public static LocalDateTime setMonth(LocalDateTime sourceDate, Integer month){
return sourceDate.withMonth(month);
}
/**
* 设置天
* @param sourceDate
* @param month
* @return LocalDateTime
*/
public static LocalDateTime setDayOfMonth(LocalDateTime sourceDate, Integer dayOfMonth){
return sourceDate.withDayOfMonth(dayOfMonth);
}
/**
* 设置小时
* @param sourceDate
* @param hour
* @return
*/
public static LocalDateTime setHour(LocalDateTime sourceDate,Integer hour){
return sourceDate.withHour(hour);
}
/**
* 设置分钟
* @param sourceDate
* @param minute
* @return
*/
public static LocalDateTime setMinute(LocalDateTime sourceDate,Integer minute){
return sourceDate.withMinute(minute);
}
/**
* 设置秒
* @param sourceDate
* @param second
* @return
*/
public static LocalDateTime setSecond(LocalDateTime sourceDate,Integer second){
return sourceDate.withSecond(second);
}
/**
* 修改年月日
* @param sourceDate
* @param year
* @param month
* @param dayOfMonth
* @return
*/
public static LocalDateTime setYMD(LocalDateTime sourceDate, Integer year, Integer month, Integer dayOfMonth) {
return sourceDate.withYear(year).withMonth(month).withDayOfMonth(dayOfMonth);
}
/**
* 修改时分秒
* @param sourceDate
* @param hour
* @param minute
* @param second
* @return
*/
public static LocalDateTime setHMS(LocalDateTime sourceDate,Integer hour, Integer minute, Integer second) {
return sourceDate.withHour(hour).withMinute(minute).withSecond(second);
}
/**
* 计算相差的天数
* @param beginDate
* @param endDate
* @return
*/
public static int getInteverDays(LocalDate beginDate,LocalDate endDate){
Period period = Period.between(beginDate, endDate);
return period.getDays();
}
/**
* 日期加减
* @param num 数量
* @param unit 单位
* @param LocalDate 原日期
* @return LocalDate 增加后的日期
*/
@SuppressWarnings("static-access")
public static LocalDate addLocalDate(long num,ChronoUnit unit,final LocalDate localDate){
LocalDate resultDate;
if(num > 0){
resultDate = localDate.now().plus(num, unit);
} else {
resultDate = localDate.now().minus(Math.abs(num), unit);
}
return resultDate;
}
/**
* 日期时分秒加
* @param num 数量
* @param unit 单位
* @param localDateTime 原日期
* @return LocalDateTime 增加后的日期
*/
@SuppressWarnings("static-access")
public static LocalDateTime addLocalDateTime(long num,ChronoUnit unit,LocalDateTime localDateTime){
LocalDateTime resultDateTime;
if(num > 0){
resultDateTime = localDateTime.now().plus(num, unit);
} else {
resultDateTime = localDateTime.now().minus(Math.abs(num),unit);
}
return resultDateTime;
}
/**
* 时分秒加减
* @param num 数量
* @param unit 单位
* @param localTime 原日期
* @return LocalDateTime 增加后的日期
*/
@SuppressWarnings("static-access")
public static LocalTime addLocalTime(long num,ChronoUnit unit,LocalTime localTime){
LocalTime resultTime;
if(num > 0){
resultTime = localTime.now().plus(num, unit);
} else {
resultTime = localTime.now().minus(Math.abs(num), unit);
}
return resultTime;
}
public static void main(String[] args){
LocalDateTime time = LocalDateTime.now();
String rr = formatter(time, "yyyy-MM-dd HH:mm:ss");
System.out.println(rr);
LocalDateTime time2 = addLocalDateTime(-2, ChronoUnit.HOURS, time);
String yy = formatter(time2, "yyyy-MM-dd HH:mm:ss");
System.out.println(yy);
}
代码涉及时间日期类的使用等内容，具有简单注释，大家可自行参考。
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