java日期处理工具类

时间：2020-11-03 13:51:32|栏目：JAVA代码|点击：次

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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