Java时间工具类，
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Java时间工具类，
Java时间工具类package com.csair.rost.rcp.internal.util;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 日期工具类
*
* @ClassName: DateUtils
* @Description: 日期工具类
* @author: duwufeng
* @date: Oct 15, 2014
*
*/
public class DateUtils {
/**
* 获取日期中的某数值。如获取月份
*
* @param date
* 日期
* @param dateType
* 日期格式
* @return 数值
*/
public static Integer getInteger(Date date, int dateType) {
Integer integer = null;
try {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
integer = calendar.get(dateType);
if (dateType == Calendar.MONTH) {//如果是月份，Calendar是从0开始的，需要+1
integer++;
}
} catch (Exception e) {
}
return integer;
}
/**
* 获取日期的年份。失败返回null。
*
* @param date
* 日期
* @return 年份
*/
public static Integer getYear(Date date) {
return getInteger(date, Calendar.YEAR);
}
/**
* 获取日期的月份。失败返回null。
*
* @param date
* 日期
* @return 月份
*/
public static Integer getMonth(Date date) {
return getInteger(date, Calendar.MONTH);
}
/**
* 获取日期的天数。失败返回null。
*
* @param date
* 日期
* @return 天
*/
public static Integer getDay(Date date) {
return getInteger(date, Calendar.DATE);
}
/**
* 获取日期的小时。失败返回null。
*
* @param date
* 日期
* @return 小时
*/
public static Integer getHour(Date date) {
return getInteger(date, Calendar.HOUR_OF_DAY);
}
/**
* 获取日期的分钟。失败返回null。
*
* @param date
* 日期
* @return 分钟
*/
public static Integer getMinute(Date date) {
return getInteger(date, Calendar.MINUTE);
}
/**
* 获取日期的秒钟。失败返回null。
*
* @param date
* 日期
* @return 秒钟
*/
public static Integer getSecond(Date date) {
return getInteger(date, Calendar.SECOND);
}
/**
* 创建日期
*
* @param year
* @param month
* @param date
* @return
*/
public static Date createDate(int year, int month, int date) {
Calendar calendar = Calendar.getInstance();
month--;
calendar.set(year, month, date);
return calendar.getTime();
}
/**
* 创建日期
*
* @param year
* @param month
* @param date
* @param hourOfDay
* @param minute
* @return
*/
public static Date createDate(int year, int month, int date, int hourOfDay,
int minute) {
Calendar calendar = Calendar.getInstance();
month--;
calendar.set(year, month, date, hourOfDay, minute);
return calendar.getTime();
}
/**
* 创建日期
*
* @param year
* @param month
* @param date
* @param hourOfDay
* @param minute
* @param second
* @return
*/
public static Date createDate(int year, int month, int date, int hourOfDay,
int minute, int second) {
Calendar calendar = Calendar.getInstance();
month--;
calendar.set(year, month, date, hourOfDay, minute, second);
return calendar.getTime();
}
/**
* 日期转成字符串
*
* @param date
* @return
*/
public static String format(Date date) {
String result = null;
if (date != null) {
SimpleDateFormat format = new SimpleDateFormat(DateStyle.YYYY_MM_DD.getValue());
result = format.format(date);
}
return result;
}
/**
* 日期转成字符串
*
* @param date
* @param pattern
* @return
*/
public static String format(Date date, String pattern) {
String result = null;
if (pattern == null) {
pattern = DateStyle.YYYY_MM_DD.getValue();
}
if (date != null) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
result = format.format(date);
}
return result;
}
/**
* 字符串转成日期
*
* @param dateStr
* @param pattern
* @return
*/
public static Date toDate(String dateStr, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
Date date = null;
try {
date = format.parse(dateStr);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 增加日期的某一个值（如增加一年/一月/一天）
* @param date
* @param dateType
* @param addNum
* @return
*/
public static Date add(Date date, int dateType, int addNum) {
Date result = null;
if (date != null) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(dateType, addNum);
result = calendar.getTime();
}
return result;
}
/**
* 将日期往后推addNum天
*
* @param date
* @param addNum
* @return
*/
public static Date addDay(Date date, int addNum) {
return add(date, Calendar.DATE, addNum);
}
/**
* 将日期往后推addNum月
*
* @param date
* @param addNum
* @return
*/
public static Date addMonth(Date date, int addNum) {
return add(date, Calendar.MONTH, addNum);
}
/**
* 将日期往后推addNum年
*
* @param date
* @param addNum
* @return
*/
public static Date addYear(Date date, int addNum) {
return add(date, Calendar.YEAR, addNum);
}
/**
* 判断两个日期前后,只判断到天
*
* @param date1
* @param date2
* @return
*/
public static boolean before(Date date1, Date date2) {
return compare(date1, date2) < 0 ? true : false;
}
/**
* 判断两个日期前后,只判断到天
*
* @param date1
* @param date2
* @return
*/
public static boolean after(Date date1, Date date2) {
return compare(date1, date2) > 0 ? true : false;
}
/**
* 判断两个日期是为同一天
*
* @param date1
* @param date2
* @return
*/
public static boolean equals(Date date1, Date date2) {
return compare(date1, date2) == 0 ? true : false;
}
/**
* 比较两个日期,date1大的返回1
*
* @param date1
* @param date2
* @return
*/
public static int compare(Date date1, Date date2) {
String dateStr1 = format(date1);
String dateStr2 = format(date2);
return dateStr1.compareTo(dateStr2);
}
/**
* 计算两个日期相差天数,1号到3号相差3天,不管小时
*
* @param littleDate
* @param bigDate
* @return
*/
public static int differActualDay(Date littleDate, Date bigDate) {
if (littleDate.after(bigDate)) {
Date tem = littleDate;
littleDate = bigDate;
bigDate = tem;
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(littleDate);
int lastDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);// 小时间的当月的最后一天
int littleNum = calendar.get(Calendar.DAY_OF_MONTH);// 小时间为当月的某一天。例如：当月第25天
calendar.setTime(bigDate);
int firstDay = calendar.getActualMinimum(Calendar.DAY_OF_MONTH);// 大时间的当月的第一天
int bigNum = calendar.get(Calendar.DAY_OF_MONTH);// 大时间为当月的某一天。例如：当月第26天
int dayNum = 0;
if (bigNum < littleNum) {// 跨月（只夸一月）
dayNum = (lastDay - littleNum + bigNum - firstDay + 2);
} else {
dayNum = (bigNum - littleNum + 1);
}
return dayNum;
}
/**
* 计算两个日期间隔天数
*
* @param littleDate
* @param bigDate
* @return
*/
public static double differDay(Date littleDate, Date bigDate) {
return differ(littleDate, bigDate, 1000 * 60 * 60 *24);
}
/**
* 计算两个日期间隔小时数
*
* @param littleDate
* @param bigDate
* @return
*/
public static double differHours(Date littleDate, Date bigDate) {
return differ(littleDate, bigDate, 1000 * 60 * 60);
}
/**
* 计算两个日期间隔分钟数
*
* @param littleDate
* @param bigDate
* @return
*/
public static double differMinute(Date littleDate, Date bigDate) {
return differ(littleDate, bigDate, 1000 * 60);
}
/**
* 计算两个日期间隔秒数
*
* @param littleDate
* @param bigDate
* @return
*/
public static double differSecond(Date littleDate, Date bigDate) {
return differ(littleDate, bigDate, 1000);
}
/**
* 根据计量单位计算计算两个日期间隔秒数(1000)/分钟数(1000*60)/小时数(1000*60*60)/天数(1000*60*60*24)
* @param littleDate
* @param bigDate
* @param divider 计量单位
* @return
*/
private static double differ(Date littleDate, Date bigDate, int divider) {
if (littleDate.after(bigDate)) {
Date tem = littleDate;
littleDate = bigDate;
bigDate = tem;
}
BigDecimal bigDecimal = new BigDecimal(Integer.toString(divider));
long result = bigDate.getTime() - littleDate.getTime();
BigDecimal bigDecimal2 = new BigDecimal(Long.toString(result));
BigDecimal decimal = bigDecimal2.divide(bigDecimal, 5, BigDecimal.ROUND_HALF_UP);
return decimal.doubleValue();
}
/**
* 获取日期的星期。失败返回null。
*
* @param date
* 日期
* @return 星期
*/
private static Week getWeek(Date date) {
Week week = null;
try {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int weekNumber = calendar.get(Calendar.DAY_OF_WEEK) - 1;
week = Week.getWeek(weekNumber);
} catch (Exception e) {
}
return week;
}
/**
* 获取中文的星期
* @param date
* @return
*/
public static String getWeekCN(Date date) {
if(date == null) {
return null;
}
Week week = getWeek(date);
return week.getChineseName();
}
/**
* 获取英文的星期
* @param date
* @return
*/
public static String getWeekEn(Date date) {
return getWeekEn(date, false);
}
/**
* 获取英文的星期
* @param date
* @param isShort 是否简写
* @return
*/
public static String getWeekEn(Date date, boolean isShort) {
if(date == null) {
return null;
}
Week week = getWeek(date);
if(isShort) {
return week.getEnShortName();
}
return week.getEnName();
}
/**
* 获取星期的序号。星期日 为7
* @param date
* @return
*/
public static int getWeekNum(Date date) {
try {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int weekNumber = calendar.get(Calendar.DAY_OF_WEEK) - 1;
return Week.getWeek(weekNumber).getNumber();
} catch (Exception e) {
}
return -1;
}
}
enum Week {
MONDAY("星期一", "Monday", "Mon", 1),
TUESDAY("星期二", "Tuesday", "Tues", 2),
WEDNESDAY("星期三", "Wednesday", "Wed", 3),
THURSDAY("星期四", "Thursday", "Thur", 4),
FRIDAY("星期五", "Friday", "Fri", 5),
SATURDAY("星期六", "Saturday", "Sat", 6),
SUNDAY("星期日", "Sunday", "Sun", 7);
private String name_cn;
private String name_en;
private String name_enShort;
private int number;
private Week(String name_cn, String name_en, String name_enShort, int number) {
this.name_cn = name_cn;
this.name_en = name_en;
this.name_enShort = name_enShort;
this.number = number;
}
public static Week getWeek(int index) {
while (index > 7) {
index -= 7;
}
while (index < 1) {
index += 7;
}
Week week = null;
switch (index) {
case 1:
week = Week.MONDAY;
break;
case 2:
week = Week.TUESDAY;
break;
case 3:
week = Week.WEDNESDAY;
break;
case 4:
week = Week.THURSDAY;
break;
case 5:
week = Week.FRIDAY;
break;
case 6:
week = Week.SATURDAY;
break;
case 7:
week = Week.SUNDAY;
break;
}
return week;
}
public String getChineseName() {
return name_cn;
}
public String getEnName() {
return name_en;
}
public String getEnShortName() {
return name_enShort;
}
public int getNumber() {
return number;
}
}
enum DateStyle {
MM_DD("MM-dd"),
YYYY_MM("yyyy-MM"),
YYYY_MM_DD("yyyy-MM-dd"),
MM_DD_HH_MM("MM-dd HH:mm"),
MM_DD_HH_MM_SS("MM-dd HH:mm:ss"),
YYYY_MM_DD_HH_MM("yyyy-MM-dd HH:mm"),
YYYY_MM_DD_HH_MM_SS("yyyy-MM-dd HH:mm:ss"),
MM_DD_EN("MM/dd"),
YYYY_MM_EN("yyyy/MM"),
YYYY_MM_DD_EN("yyyy/MM/dd"),
MM_DD_HH_MM_EN("MM/dd HH:mm"),
MM_DD_HH_MM_SS_EN("MM/dd HH:mm:ss"),
YYYY_MM_DD_HH_MM_EN("yyyy/MM/dd HH:mm"),
YYYY_MM_DD_HH_MM_SS_EN("yyyy/MM/dd HH:mm:ss"),
MM_DD_CN("MM月dd日"),
YYYY_MM_CN("yyyy年MM月"),
YYYY_MM_DD_CN("yyyy年MM月dd日"),
MM_DD_HH_MM_CN("MM月dd日 HH:mm"),
MM_DD_HH_MM_SS_CN("MM月dd日 HH:mm:ss"),
YYYY_MM_DD_HH_MM_CN("yyyy年MM月dd日 HH:mm"),
YYYY_MM_DD_HH_MM_SS_CN("yyyy年MM月dd日 HH:mm:ss"),
HH_MM("HH:mm"),
HH_MM_SS("HH:mm:ss");
private String value;
DateStyle(String value) {
this.value = value;
}
public String getValue() {
return value;
}
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