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这篇文章将为大家详细讲解有关Java日期操作方法工具类的示例分析，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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本文实例讲述了Java日期操作方法工具类，具体如下：
package com.gcloud.common;
import org.apache.http.util.TextUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.regex.Pattern;
/**
* 日期时间工具类
* Created by charlin on 2017/9/3.
*/
public class DateUtil {
public static final String CHINA_DATE_FORMAT = "yyyy年MM月dd日";
public static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
public static final String DATE_FORMAT = "yyyy-MM-dd";
public static final String TIME_FORMAT = "HH:mm:ss";
//----------------判断-----------------------------------------------
/**
* 是否是润年
* @param yearNum
* @return
*/
public static boolean isLeapYear(int yearNum) {
boolean isLeep = false;
if ((yearNum % 4 == 0) && (yearNum % 100 != 0))
isLeep = true;
else if (yearNum % 400 == 0)
isLeep = true;
else {
isLeep = false;
}
return isLeep;
}
/**
* 判断是否是日期
*
* @param date
* @return
*/
public static boolean isDate(String date) {
//判断年月日的正则表达式，接受输入格式为2010-12-24，可接受平年闰年的日期
String regex = "(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)";
Pattern pattern = Pattern.compile(regex);
return pattern.matcher(date).matches();
}
/**
* 验证是不是生日
*
* @param birthday
* @return
*/
public static boolean verifyBirthDay(String birthday) {
if (TextUtils.isEmpty(birthday)) return false;
if (!birthday.contains("-")) return false;
String[] arr = birthday.split("-");
if (null == arr || arr.length != 3 || arr[0].length() != 4 || arr[1].length() != 2 || arr[2].length() != 2)
return false;
int year = getYear(new Date());
int birthYear = Integer.parseInt(arr[0]);
if (birthYear <= 1900 || birthYear > year) return false;
String curDate = formatDate(new Date(), DATE_FORMAT);
if (birthday.compareTo(curDate) > 0) return false;
return isDate(birthday);
}
//-------------------自动转化--------------------------------------------
/**
* 把字符串自动转化为时间格式
*
* @param dateStr
* @return
*/
public static Date parseDateByAuto(String dateStr) {
if (StringUtil.isEmpty(dateStr)) {
return null;
}
String format = DATE_FORMAT;
if (dateStr.indexOf("/") > -1) {
format = format.replace("-", "/");
}
if (dateStr.indexOf(":") != -1) {
format += " HH:mm";
}
//存在秒
if (dateStr.indexOf(":") != dateStr.lastIndexOf(":")) {
format += ":ss";
}
return parseDate(dateStr, format);
}
/**
* 自动识别格式
* @param date
* @return
*/
public static String formatDateByAuto(Date date){
String format = DATE_FORMAT;
if( !(date instanceof java.sql.Date) && (date.getSeconds()>0||date.getMinutes()>0||date.getHours()>0)){
format = DATETIME_FORMAT;
}
return formatDate(date, format);
}
//------------当前日期与时间 --------------------------------
/**取当前日期*/
public static Date getCurrDate() {return parseDate(formatDate(new Date())); }
/**取当前时间*/
public static Date getCurrDateTime() {return parseDate(formatDate(new Date())); }
/**取当前日期*/
public static String getCurrDateStr() { return formatDate(new Date()); }
/**取当前时间*/
public static String getCurrDateTimeStr() { return formatDate(new Date(), DATETIME_FORMAT);}
public static String formatCurrDate() {return formatDate(new Date(),DATE_FORMAT); }
public static String formatCurrDateTime() {return formatDate(new Date(),DATETIME_FORMAT);}
public static String formatCurrDateToS(String strFormat) {return formatDate(new Date(), strFormat); }
//-----------时间计算--------------------------------------------
/**
* 时间相减
* @param strDateBegin
* @param strDateEnd
* @param iType
* @return
*/
public static int getDiffDate(String strDateBegin, String strDateEnd, int iType) {
Calendar calBegin = Calendar.getInstance();
calBegin.setTime(parseDate(strDateBegin, DATETIME_FORMAT));
Calendar calEnd = Calendar.getInstance();
calBegin.setTime(parseDate(strDateEnd, DATETIME_FORMAT));
long lBegin = calBegin.getTimeInMillis();
long lEnd = calEnd.getTimeInMillis();
if (iType == Calendar.SECOND)
return (int) ((lEnd - lBegin) / 1000L);
if (iType == Calendar.MINUTE)
return (int) ((lEnd - lBegin) / 60000L);
if (iType == Calendar.HOUR)
return (int) ((lEnd - lBegin) / 3600000L);
if (iType == Calendar.DAY_OF_MONTH) {
return (int) ((lEnd - lBegin) / 86400000L);
}
return -1;
}
/**
* 添加天数或月份或年得到新的时间
*
* @param strDate
* @param count
* @param dayType Calendar.YEAR
* @return
*/
public static String getAddDateTime(String strDate, int count, int dayType) {
Calendar cal = Calendar.getInstance();
cal.setTime(parseDate(strDate));
cal.add(dayType, count);
SimpleDateFormat sdf = null;
if ((dayType == Calendar.YEAR) || (dayType == Calendar.MONTH) || (dayType == Calendar.DAY_OF_MONTH))
sdf = new SimpleDateFormat(DATE_FORMAT);
else
sdf = new SimpleDateFormat(DATETIME_FORMAT);
return sdf.format(cal.getTime());
}
/**
* 日期增加天数
* @param date
* @param iCount
* @return
*/
public static Date getAddDate(Date date, int iCount) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.DAY_OF_MONTH, iCount);
return cal.getTime();
}
/**
* 比较日期
*
* @param dateStr1
* @param dateStr2
* @return
*/
public static int compareDate(String dateStr1, String dateStr2) {
Date date1 = parseDate(dateStr1);
Date date2 = parseDate(dateStr2);
if (date1.getTime() > date2.getTime())
return -1;
else if (date1.getTime() < date2.getTime())
return 1;
else
return 0;
}
public static int compareDate(Date date1, Date date2) {
if (date1.getTime() > date2.getTime())
return -1;
else if (date1.getTime() < date2.getTime())
return 1;
else
return 0;
}
/**
* 时间差
*
* @param startDate
* @param endDate
* @return
*/
public static int getDiffDays(Date startDate, Date endDate) {
int days = 0;
if (startDate.after(endDate)) {
Date temp = startDate;
startDate = endDate;
endDate = temp;
}
days = (int) (endDate.getTime() - startDate.getTime()) / 1000 * 60 * 60 * 24;
return days;
}
/**
* 当前日期的后几天
*
* @param date
* @param n
* @return
*/
public static Date getAfterDay(Date date, int n) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(Calendar.DATE, n);
return c.getTime();
}
//---------获取时间天数----------------------------------------------
/**
* 获取当前月的最后一天
*
* @param dateStr
* @return
*/
public static String getMonthEnd(String dateStr) {
//当前第一天
Date date = parseDate(getMonthBegin(dateStr));
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(Calendar.MONTH, 1);
c.add(Calendar.DAY_OF_YEAR, -1);
return formatDate(c.getTime());
}
public static String getMonthEnd(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DATE, c.getActualMaximum(Calendar.DATE));
return formatDate(c.getTime());
}
/**
* 获得当前日期的月份第一天
*
* @param dateStr
* @return
*/
public static String getMonthBegin(String dateStr) {
Date date = parseDate(dateStr);
return formatDate(date, "yyyy-MM") + 01;
}
public static String getMonthBegin(Date date) {
return formatDate(date, "yyyy-MM") + 01;
}
//--------------格式化日期-----------------------------------------
/**
* 格式化日期为字符串
*
* @param date
* @param format
* @return
*/
public static String formatDate(Date date, String format) {
return new SimpleDateFormat(format).format(date);
}
public static String formatDate(Date date) {
return formatDate(date, DATE_FORMAT);
}
public static String formateChinaDate(Date date) {
return formatDate(date, CHINA_DATE_FORMAT);
}
public static String formateDateTime(Date date) {
return formatDate(date, DATETIME_FORMAT);
}
public static String formateTime(Date date) {
return formatDate(date, TIME_FORMAT);
}
//-----------------格式化字符串为日期--------------------------------------
/**
* 格式化字符串为日期
*
* @param date
* @param format
* @return
*/
public static Date parseDate(String date, String format) {
try {
return new SimpleDateFormat(format).parse(date);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
public static Date parseDate(String date) { return parseDate(date, DATE_FORMAT);}
public static Date parseChinaDate(String date) {
return parseDate(date, CHINA_DATE_FORMAT);
}
public static Date parseDateTime(String date) {
return parseDate(date, DATETIME_FORMAT);
}
public static Date parseTime(String date) {
return parseDate(date, TIME_FORMAT);
}
//---获取年月日时分秒----------------------------------------------------
/**
* 获取年份
*
* @param date
* @return
*/
public static int getYear(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.YEAR);
}
/**
* 获取月份
*
* @param date
* @return
*/
public static int getMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MONTH) + 1;
}
/**
* 获取日
*
* @param date
* @return
*/
public static int getDay(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_MONTH);
}
/**
* 获取星期
*
* @param date
* @return
*/
public static int getWeek(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_WEEK);
}
/**
* 获取时间
*
* @param date
* @return
*/
public static int getHour(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.HOUR_OF_DAY);
}
/**
* 获取分种
*
* @param date
* @return
*/
public static int getMinute(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MINUTE);
}
/**
* 获取秒
*
* @param date
* @return
*/
public static int getSecond(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.SECOND);
}
//--------------获取星期几---------------------------------------------------
/**
* 获取星期几
*
* @param strDate
* @return
*/
public static String getWeekDayName(String strDate) {
String[] mName = {"日", "一", "二", "三", "四", "五", "六"};
Date date = parseDate(strDate);
int week = getWeek(date);
return "星期" + mName[week];
}
public static String getWeekDayName(Date date) {
String[] mName = {"日", "一", "二", "三", "四", "五", "六"};
int week = getWeek(date);
return "星期" + mName[week];
}
/**
* 一年中的星期几
* @return
*/
public static int getWeekNumOfYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.WEEK_OF_YEAR);
}
public static int getWeekNumOfYear(String date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(parseDate(date, DATE_FORMAT));
return calendar.get(Calendar.WEEK_OF_YEAR);
}
/**
* 获取本周星期一的日期
* @param yearNum
* @param weekNum
* @return
* @throws ParseException
*/
public static String getYearWeekFirstDay(int yearNum, int weekNum) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, yearNum);
cal.set(Calendar.WEEK_OF_YEAR, weekNum);
cal.set(Calendar.DAY_OF_WEEK, 2);
String tempYear = Integer.toString(yearNum);
String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1);
String tempDay = Integer.toString(cal.get(Calendar.DAY_OF_MONTH)-1);
return tempYear + "-" + tempMonth + "-" + tempDay;
}
/**
* 获取本周星期天的日期
* @param yearNum
* @param weekNum
* @return
* @throws ParseException
*/
public static String getYearWeekEndDay(int yearNum, int weekNum) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, yearNum);
cal.set(Calendar.WEEK_OF_YEAR, weekNum + 1);
cal.set(Calendar.DAY_OF_WEEK, 1);
String tempYear = Integer.toString(yearNum);
String tempMonth = Integer.toString(cal.get(Calendar.MONTH) + 1);
String tempDay = Integer.toString(cal.get(Calendar.DAY_OF_MONTH)-1);
return tempYear + "-" + tempMonth + "-" + tempDay;
}
//--------------获取天数---------------------------------------------------
/**
* 获取某年某月的第一天
* @param yearNum
* @param monthNum
* @return
*/
public static Date getYearMonthFirstDay(int yearNum, int monthNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, monthNum - 1, 1, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取某年下个月的第一天
* @param yearNum
* @param monthNum
* @return
*/
public static Date getNextYearMonthFirstDay(int yearNum, int monthNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, monthNum, 1, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取某年某月的最后一天
* @param yearNum
* @param monthNum
* @return
*/
public static Date getYearMonthEndDay(int yearNum, int monthNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, monthNum, 0, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取某月的第一天
* @param date
* @return
*/
public static Date getYearMonthFirstDay(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(5, 1);
cal.set(11, 0);
cal.set(12, 0);
cal.set(13, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取下一年的第一天
* @param date
* @return
*/
public static Date getNextYearMonthFirstDay(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(2, 1);
cal.set(5, 1);
cal.set(11, 0);
cal.set(12, 0);
cal.set(13, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取当前月的最后一天
* @param date
* @return
*/
public static Date getYearMonthEndDay(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(5, cal.getActualMaximum(5));
cal.set(11, 0);
cal.set(12, 0);
cal.set(13, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取当年的第一天
* @param yearNum
* @return
*/
public static Date getYearFirstDay(int yearNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, 0, 1, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取下一年的第一天
* @param yearNum
* @return
*/
public static Date getNextYearFirstDay(int yearNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, 12, 1, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取当年的最后一天
* @param yearNum
* @return
*/
public static Date getYearEndDay(int yearNum) {
Calendar cal = Calendar.getInstance();
cal.set(yearNum, 12, 0, 0, 0, 0);
cal.set(14, 0);
return cal.getTime();
}
/**
* 获取当前星期
* @param strDate
* @param weekNum
* @return
*/
public static String getWeek(String strDate, int weekNum) {
Calendar c = Calendar.getInstance();
c.setTime(parseDate(strDate));
if (weekNum == 1)
c.set(7, 2);
else if (weekNum == 2)
c.set(7, 3);
else if (weekNum == 3)
c.set(7, 4);
else if (weekNum == 4)
c.set(7, 5);
else if (weekNum == 5)
c.set(7, 6);
else if (weekNum == 6)
c.set(7, 7);
else if (weekNum == 0)
c.set(7, 1);
return formatDate(c.getTime());
}
public static Date getWeek(Date date, int weekNum) {
Calendar c = Calendar.getInstance();
c.setTime(date);
if (weekNum == 1)
c.set(7, 2);
else if (weekNum == 2)
c.set(7, 3);
else if (weekNum == 3)
c.set(7, 4);
else if (weekNum == 4)
c.set(7, 5);
else if (weekNum == 5)
c.set(7, 6);
else if (weekNum == 6)
c.set(7, 7);
else if (weekNum == 0)
c.set(7, 1);
return c.getTime();
}
/**
* 下个月日期
* @param date
* @return
*/
public static Date getNextMonday(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
do
c.add(Calendar.DAY_OF_MONTH, 1);
while (c.get(Calendar.DAY_OF_WEEK) != 2);
return c.getTime();
}
/**
* 获得某一日期的前一天
*
*/
public static Date getPreviousDate(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DATE, -1);
calendar.set(Calendar.HOUR, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.MILLISECOND, 0);
return getSqlDate(calendar.getTime());
}
/**
* 获得某年某月最后一天的日期
*
*/
public static Date getLastDayOfMonth(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH, month);
calendar.set(Calendar.DATE, 1);
return getPreviousDate(getSqlDate(calendar.getTime()));
}
/**
* 获取一个月的天数
* @param year
* @param month
* @return
*/
public static int getDaysInMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month - 1);// Java月份才0开始算
return cal.getActualMaximum(Calendar.DATE);
}
//----------------根据用户生日计算年龄-------------------------------------------------
/**
* 根据用户生日计算年龄
*/
public static int getAgeByBirthday(Date birthday) {
Calendar cal = Calendar.getInstance();
if (cal.before(birthday)) {
throw new IllegalArgumentException("The birthDay is before Now.It's unbelievable!");
}
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH) + 1;
int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
cal.setTime(birthday);
int yearBirth = cal.get(Calendar.YEAR);
int monthBirth = cal.get(Calendar.MONTH) + 1;
int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);
int age = yearNow - yearBirth;
if (monthNow <= monthBirth) {
if (monthNow == monthBirth) {
if (dayOfMonthNow < dayOfMonthBirth) {
age--;
}
} else {
age--;
}
}
return age;
}
/**
* 由java.util.Date到java.sql.Date的类型转换
*
*/
public static Date getSqlDate(java.util.Date date) {
return new Date(date.getTime());
}
public static void main(String[] args) {
//dd
System.out.println("创新互联测试结果：");
System.out.println("2017年 2月最后一天日期为："+getLastDayOfMonth(2017, 2));
System.out.println("2017年第一天日期为："+getYearFirstDay(2017));
System.out.println("2017年最后一天日期为："+getYearEndDay(2017)); }
}运行结果：
1. 简单，只需理解基本的概念，就可以编写适合于各种情况的应用程序；2. 面向对象；3. 分布性，Java是面向网络的语言；4. 鲁棒性，java提供自动垃圾收集来进行内存管理，防止程序员在管理内存时容易产生的错误。；5. 安全性，用于网络、分布环境下的Java必须防止病毒的入侵。6. 体系结构中立，只要安装了Java运行时系统，就可在任意处理器上运行。7. 可移植性，Java可以方便地移植到网络上的不同机器。8.解释执行，Java解释器直接对Java字节码进行解释执行。
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