java日期处理工具类

本文针对日期处理进行学习使用，主要分为两部分，下面为大家具体介绍一下

第一部分：日期处理基础知识

Date 类
作用：最主要的作用就是获得当前时间
将日期转换为标准格式

Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str = sdf.format(date);
System.out.println(“2015-10-16 14:59:52”);

将String转换为Date类型

String day = "2014-6-5 10:30:30";
SimpleDateFormat d2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date2 = d2.parse(day);
System.out.println(“Thu Jun 05 10:30:30 CST 2014”);

Calendar 类的应用

java.util.Calendar 类是一个抽象类，可以通过调用 getInstance() 静态方法获取一个 Calendar 对象，此对象已由当前日期时间初始化，即默认代表当前时间

Calendar c = Calendar.getInstance();
int year = c.get(Calender.YEAR);
int month= c.get(Calender.MONTH)+1; //获取月份，0表示1月份
int day = c.get(Calender.DAY_OF_MONTH);
int hour= c.get(Calender.HOUR_OF_DAY);
int minute= c.get(Calender.MINUTE);
int second = c.get(Calender.SECOND);

比较2个时间相差的月份

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
DateTime d1 = new DateTime(format.parse("2016-10-31 00:00:00"));
DateTime d2 = new DateTime(format.parse("2015-1-31 00:00:00"));
System.out.println(Math.abs(Months.monthsBetween(d1,d2).getMonths()));

第二部分：日期处理工具类

package com.analysys.website.control;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
/**
* 日期处理工具类
* @author dylan_xu
* @date Mar 11, 2012
* @modified by
* @modified date
* @since JDK1.6
* @see com.util.DateUtil
*/
public class DateUtil {
// ~ Static fields/initializers
// =============================================
private static Logger logger = Logger.getLogger(DateUtil.class);
private static String defaultDatePattern = null;
private static String timePattern = "HH:mm";
private static Calendar cale = Calendar.getInstance();
public static final String TS_FORMAT = DateUtil.getDatePattern() + " HH:mm:ss.S";
/** 日期格式yyyy-MM字符串常量 */
private static final String MONTH_FORMAT = "yyyy-MM";
/** 日期格式yyyy-MM-dd字符串常量 */
private static final String DATE_FORMAT = "yyyy-MM-dd";
/** 日期格式HH:mm:ss字符串常量 */
private static final String HOUR_FORMAT = "HH:mm:ss";
/** 日期格式yyyy-MM-dd HH:mm:ss字符串常量 */
private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
/** 某天开始时分秒字符串常量 00:00:00 */
private static final String DAY_BEGIN_STRING_HHMMSS = " 00:00:00";
/** 某天结束时分秒字符串常量 23:59:59 */
public static final String DAY_END_STRING_HHMMSS = " 23:59:59";
private static SimpleDateFormat sdf_date_format = new SimpleDateFormat(DATE_FORMAT);
private static SimpleDateFormat sdf_hour_format = new SimpleDateFormat(HOUR_FORMAT);
private static SimpleDateFormat sdf_datetime_format = new SimpleDateFormat(DATETIME_FORMAT);
// ~ Methods
// ================================================================
public DateUtil() {
}
/**
* 获得服务器当前日期及时间，以格式为：yyyy-MM-dd HH:mm:ss的日期字符串形式返回
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getDateTime() {
try {
return sdf_datetime_format.format(cale.getTime());
} catch (Exception e) {
logger.debug("DateUtil.getDateTime():" + e.getMessage());
return "";
}
}
/**
* 获得服务器当前日期，以格式为：yyyy-MM-dd的日期字符串形式返回
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getDate() {
try {
return sdf_date_format.format(cale.getTime());
} catch (Exception e) {
logger.debug("DateUtil.getDate():" + e.getMessage());
return "";
}
}
/**
* 获得服务器当前时间，以格式为：HH:mm:ss的日期字符串形式返回
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getTime() {
String temp = " ";
try {
temp += sdf_hour_format.format(cale.getTime());
return temp;
} catch (Exception e) {
logger.debug("DateUtil.getTime():" + e.getMessage());
return "";
}
}
/**
* 统计时开始日期的默认值
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getStartDate() {
try {
return getYear() + "-01-01";
} catch (Exception e) {
logger.debug("DateUtil.getStartDate():" + e.getMessage());
return "";
}
}
/**
* 统计时结束日期的默认值
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getEndDate() {
try {
return getDate();
} catch (Exception e) {
logger.debug("DateUtil.getEndDate():" + e.getMessage());
return "";
}
}
/**
* 获得服务器当前日期的年份
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getYear() {
try {
return String.valueOf(cale.get(Calendar.YEAR));
} catch (Exception e) {
logger.debug("DateUtil.getYear():" + e.getMessage());
return "";
}
}
/**
* 获得服务器当前日期的月份
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getMonth() {
try {
java.text.DecimalFormat df = new java.text.DecimalFormat();
df.applyPattern("00;00");
return df.format((cale.get(Calendar.MONTH) + 1));
} catch (Exception e) {
logger.debug("DateUtil.getMonth():" + e.getMessage());
return "";
}
}
/**
* 获得服务器在当前月中天数
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getDay() {
try {
return String.valueOf(cale.get(Calendar.DAY_OF_MONTH));
} catch (Exception e) {
logger.debug("DateUtil.getDay():" + e.getMessage());
return "";
}
}
/**
* 比较两个日期相差的天数
* @author dylan_xu
* @date Mar 11, 2012
* @param date1
* @param date2
* @return
*/
public static int getMargin(String date1, String date2) {
int margin;
try {
ParsePosition pos = new ParsePosition(0);
ParsePosition pos1 = new ParsePosition(0);
Date dt1 = sdf_date_format.parse(date1, pos);
Date dt2 = sdf_date_format.parse(date2, pos1);
long l = dt1.getTime() - dt2.getTime();
margin = (int) (l / (24 * 60 * 60 * 1000));
return margin;
} catch (Exception e) {
logger.debug("DateUtil.getMargin():" + e.toString());
return 0;
}
}
/**
* 比较两个日期相差的天数
* @author dylan_xu
* @date Mar 11, 2012
* @param date1
* @param date2
* @return
*/
public static double getDoubleMargin(String date1, String date2) {
double margin;
try {
ParsePosition pos = new ParsePosition(0);
ParsePosition pos1 = new ParsePosition(0);
Date dt1 = sdf_datetime_format.parse(date1, pos);
Date dt2 = sdf_datetime_format.parse(date2, pos1);
long l = dt1.getTime() - dt2.getTime();
margin = (l / (24 * 60 * 60 * 1000.00));
return margin;
} catch (Exception e) {
logger.debug("DateUtil.getMargin():" + e.toString());
return 0;
}
}
/**
* 比较两个日期相差的月数
* @author dylan_xu
* @date Mar 11, 2012
* @param date1
* @param date2
* @return
*/
public static int getMonthMargin(String date1, String date2) {
int margin;
try {
margin = (Integer.parseInt(date2.substring(0, 4)) - Integer.parseInt(date1.substring(0, 4))) * 12;
margin += (Integer.parseInt(date2.substring(4, 7).replaceAll("-0",
"-")) - Integer.parseInt(date1.substring(4, 7).replaceAll("-0", "-")));
return margin;
} catch (Exception e) {
logger.debug("DateUtil.getMargin():" + e.toString());
return 0;
}
}
/**
* 返回日期加X天后的日期
* @author dylan_xu
* @date Mar 11, 2012
* @param date
* @param i
* @return
*/
public static String addDay(String date, int i) {
try {
GregorianCalendar gCal = new GregorianCalendar(
Integer.parseInt(date.substring(0, 4)),
Integer.parseInt(date.substring(5, 7)) - 1,
Integer.parseInt(date.substring(8, 10)));
gCal.add(GregorianCalendar.DATE, i);
return sdf_date_format.format(gCal.getTime());
} catch (Exception e) {
logger.debug("DateUtil.addDay():" + e.toString());
return getDate();
}
}
/**
* 返回日期加X月后的日期
* @author dylan_xu
* @date Mar 11, 2012
* @param date
* @param i
* @return
*/
public static String addMonth(String date, int i) {
try {
GregorianCalendar gCal = new GregorianCalendar(
Integer.parseInt(date.substring(0, 4)),
Integer.parseInt(date.substring(5, 7)) - 1,
Integer.parseInt(date.substring(8, 10)));
gCal.add(GregorianCalendar.MONTH, i);
return sdf_date_format.format(gCal.getTime());
} catch (Exception e) {
logger.debug("DateUtil.addMonth():" + e.toString());
return getDate();
}
}
/**
* 返回日期加X年后的日期
* @author dylan_xu
* @date Mar 11, 2012
* @param date
* @param i
* @return
*/
public static String addYear(String date, int i) {
try {
GregorianCalendar gCal = new GregorianCalendar(
Integer.parseInt(date.substring(0, 4)),
Integer.parseInt(date.substring(5, 7)) - 1,
Integer.parseInt(date.substring(8, 10)));
gCal.add(GregorianCalendar.YEAR, i);
return sdf_date_format.format(gCal.getTime());
} catch (Exception e) {
logger.debug("DateUtil.addYear():" + e.toString());
return "";
}
}
/**
* 返回某年某月中的最大天
* @author dylan_xu
* @date Mar 11, 2012
* @param year
* @param month
* @return
*/
public static int getMaxDay(int iyear, int imonth) {
int day = 0;
try {
if (imonth == 1 || imonth == 3 || imonth == 5 || imonth == 7
|| imonth == 8 || imonth == 10 || imonth == 12) {
day = 31;
} else if (imonth == 4 || imonth == 6 || imonth == 9 || imonth == 11) {
day = 30;
} else if ((0 == (iyear % 4)) && (0 != (iyear % 100)) || (0 == (iyear % 400))) {
day = 29;
} else {
day = 28;
}
return day;
} catch (Exception e) {
logger.debug("DateUtil.getMonthDay():" + e.toString());
return 1;
}
}
/**
* 格式化日期
* @author dylan_xu
* @date Mar 11, 2012
* @param orgDate
* @param Type
* @param Span
* @return
*/
@SuppressWarnings("static-access")
public String rollDate(String orgDate, int Type, int Span) {
try {
String temp = "";
int iyear, imonth, iday;
int iPos = 0;
char seperater = '-';
if (orgDate == null || orgDate.length() < 6) {
return "";
}
iPos = orgDate.indexOf(seperater);
if (iPos > 0) {
iyear = Integer.parseInt(orgDate.substring(0, iPos));
temp = orgDate.substring(iPos + 1);
} else {
iyear = Integer.parseInt(orgDate.substring(0, 4));
temp = orgDate.substring(4);
}
iPos = temp.indexOf(seperater);
if (iPos > 0) {
imonth = Integer.parseInt(temp.substring(0, iPos));
temp = temp.substring(iPos + 1);
} else {
imonth = Integer.parseInt(temp.substring(0, 2));
temp = temp.substring(2);
}
imonth--;
if (imonth < 0 || imonth > 11) {
imonth = 0;
}
iday = Integer.parseInt(temp);
if (iday < 1 || iday > 31)
iday = 1;
Calendar orgcale = Calendar.getInstance();
orgcale.set(iyear, imonth, iday);
temp = this.rollDate(orgcale, Type, Span);
return temp;
} catch (Exception e) {
return "";
}
}
public static String rollDate(Calendar cal, int Type, int Span) {
try {
String temp = "";
Calendar rolcale;
rolcale = cal;
rolcale.add(Type, Span);
temp = sdf_date_format.format(rolcale.getTime());
return temp;
} catch (Exception e) {
return "";
}
}
/**
* 返回默认的日期格式
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static synchronized String getDatePattern() {
defaultDatePattern = "yyyy-MM-dd";
return defaultDatePattern;
}
/**
* 将指定日期按默认格式进行格式代化成字符串后输出如：yyyy-MM-dd
* @author dylan_xu
* @date Mar 11, 2012
* @param aDate
* @return
*/
public static final String getDate(Date aDate) {
SimpleDateFormat df = null;
String returnValue = "";
if (aDate != null) {
df = new SimpleDateFormat(getDatePattern());
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* 取得给定日期的时间字符串，格式为当前默认时间格式
* @author dylan_xu
* @date Mar 11, 2012
* @param theTime
* @return
*/
public static String getTimeNow(Date theTime) {
return getDateTime(timePattern, theTime);
}
/**
* 取得当前时间的Calendar日历对象
* @author dylan_xu
* @date Mar 11, 2012
* @return
* @throws ParseException
*/
public Calendar getToday() throws ParseException {
Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat(getDatePattern());
String todayAsString = df.format(today);
Calendar cal = new GregorianCalendar();
cal.setTime(convertStringToDate(todayAsString));
return cal;
}
/**
* 将日期类转换成指定格式的字符串形式
* @author dylan_xu
* @date Mar 11, 2012
* @param aMask
* @param aDate
* @return
*/
public static final String getDateTime(String aMask, Date aDate) {
SimpleDateFormat df = null;
String returnValue = "";
if (aDate == null) {
logger.error("aDate is null!");
} else {
df = new SimpleDateFormat(aMask);
returnValue = df.format(aDate);
}
return (returnValue);
}
/**
* 将指定的日期转换成默认格式的字符串形式
* @author dylan_xu
* @date Mar 11, 2012
* @param aDate
* @return
*/
public static final String convertDateToString(Date aDate) {
return getDateTime(getDatePattern(), aDate);
}
/**
* 将日期字符串按指定格式转换成日期类型
* @author dylan_xu
* @date Mar 11, 2012
* @param aMask 指定的日期格式，如:yyyy-MM-dd
* @param strDate 待转换的日期字符串
* @return
* @throws ParseException
*/
public static final Date convertStringToDate(String aMask, String strDate)
throws ParseException {
SimpleDateFormat df = null;
Date date = null;
df = new SimpleDateFormat(aMask);
if (logger.isDebugEnabled()) {
logger.debug("converting '" + strDate + "' to date with mask '" + aMask + "'");
}
try {
date = df.parse(strDate);
} catch (ParseException pe) {
logger.error("ParseException: " + pe);
throw pe;
}
return (date);
}
/**
* 将日期字符串按默认格式转换成日期类型
* @author dylan_xu
* @date Mar 11, 2012
* @param strDate
* @return
* @throws ParseException
*/
public static Date convertStringToDate(String strDate)
throws ParseException {
Date aDate = null;
try {
if (logger.isDebugEnabled()) {
logger.debug("converting date with pattern: " + getDatePattern());
}
aDate = convertStringToDate(getDatePattern(), strDate);
} catch (ParseException pe) {
logger.error("Could not convert '" + strDate + "' to a date, throwing exception");
throw new ParseException(pe.getMessage(), pe.getErrorOffset());
}
return aDate;
}
/**
* 返回一个JAVA简单类型的日期字符串
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
public static String getSimpleDateFormat() {
SimpleDateFormat formatter = new SimpleDateFormat();
String NDateTime = formatter.format(new Date());
return NDateTime;
}
/**
* 将指定字符串格式的日期与当前时间比较
* @author DYLAN
* @date Feb 17, 2012
* @param strDate 需要比较时间
* @return
*   <p>
*   int code
*   <ul>
*   <li>-1 当前时间 < 比较时间 </li>
*   <li> 0 当前时间 = 比较时间 </li>
*   <li>>=1当前时间 > 比较时间 </li>
*   </ul>
*   </p>
*/
public static int compareToCurTime (String strDate) {
if (StringUtils.isBlank(strDate)) {
return -1;
}
Date curTime = cale.getTime();
String strCurTime = null;
try {
strCurTime = sdf_datetime_format.format(curTime);
} catch (Exception e) {
if (logger.isDebugEnabled()) {
logger.debug("[Could not format '" + strDate + "' to a date, throwing exception:" + e.getLocalizedMessage() + "]");
}
}
if (StringUtils.isNotBlank(strCurTime)) {
return strCurTime.compareTo(strDate);
}
return -1;
}
/**
* 为查询日期添加最小时间
*
* @param 目标类型Date
* @param 转换参数Date
* @return
*/
@SuppressWarnings("deprecation")
public static Date addStartTime(Date param) {
Date date = param;
try {
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
return date;
} catch (Exception ex) {
return date;
}
}
/**
* 为查询日期添加最大时间
*
* @param 目标类型Date
* @param 转换参数Date
* @return
*/
@SuppressWarnings("deprecation")
public static Date addEndTime(Date param) {
Date date = param;
try {
date.setHours(23);
date.setMinutes(59);
date.setSeconds(0);
return date;
} catch (Exception ex) {
return date;
}
}
/**
* 返回系统现在年份中指定月份的天数
*
* @param 月份month
* @return 指定月的总天数
*/
@SuppressWarnings("deprecation")
public static String getMonthLastDay(int month) {
Date date = new Date();
int[][] day = { { 0, 30, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } };
int year = date.getYear() + 1900;
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
return day[1][month] + "";
} else {
return day[0][month] + "";
}
}
/**
* 返回指定年份中指定月份的天数
*
* @param 年份year
* @param 月份month
* @return 指定月的总天数
*/
public static String getMonthLastDay(int year, int month) {
int[][] day = { { 0, 30, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } };
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
return day[1][month] + "";
} else {
return day[0][month] + "";
}
}
/**
* 判断是平年还是闰年
* @author dylan_xu
* @date Mar 11, 2012
* @param year
* @return
*/
public static boolean isLeapyear(int year) {
if ((year % 4 == 0 && year % 100 != 0) || (year % 400) == 0) {
return true;
} else {
return false;
}
}
/**
* 取得当前时间的日戳
* @author dylan_xu
* @date Mar 11, 2012
* @return
*/
@SuppressWarnings("deprecation")
public static String getTimestamp() {
Date date = cale.getTime();
String timestamp = "" + (date.getYear() + 1900) + date.getMonth()
+ date.getDate() + date.getMinutes() + date.getSeconds()
+ date.getTime();
return timestamp;
}
/**
* 取得指定时间的日戳
*
* @return
*/
@SuppressWarnings("deprecation")
public static String getTimestamp(Date date) {
String timestamp = "" + (date.getYear() + 1900) + date.getMonth()
+ date.getDate() + date.getMinutes() + date.getSeconds()
+ date.getTime();
return timestamp;
}
public static void main(String[] args) {
System.out.println(getYear() + "|" + getMonth() + "|" + getDate());
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助。

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