java 日期工具类 DateUtil

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package com.spider.util;import java.sql.Timestamp;import java.text.ParsePosition;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.GregorianCalendar;import java.util.Locale;public class DateUtil {        public static final String CHS_DATETIME_FORMAT_MASK = "yyyy-MM-dd HH:mm:ss";        public static final String CHS_DATE_FORMAT_MASK = "yyyy-MM-dd";        public static int getCurrentYear() {               return Calendar.getInstance().get(Calendar. YEAR);       }        public static java.util.Date getCurrentUtilDate() {               return Calendar.getInstance().getTime();       }        public static java.sql.Date getCurrentSqlDate() {               return new java.sql.Date(getCurrentUtilDate ().getTime());       }        public static java.sql.Timestamp getCurrentTimestamp() {               return new java.sql.Timestamp(getCurrentUtilDate ().getTime());       }        public static java.sql.Timestamp utilDateToTimestamp(java.util.Date date) {               if (date != null) {                      return new java.sql.Timestamp(date.getTime());              }               return null ;       }        public static java.util.Date timestampToUtilDate(java.sql.Timestamp timestamp) {               if (timestamp != null) {                      return new java.util.Date(timestamp.getTime());              }               return null ;       }        public static java.sql.Date utilDateToSqlDate(java.util.Date date) {               if (date != null) {                      return new java.sql.Date(date.getTime());              }               return null ;       }        public static boolean isDateFormat(String strDate, String pattern) {               return strToUtilDate( strDate, pattern) != null;       }        public static java.util.Date strToUtilDate(String strDate) {               return strToUtilDate( strDate, DateUtil. CHS_DATETIME_FORMAT_MASK);       }        public static java.util.Date strToUtilDate(String strDate, String pattern) {               if (!StringUtil.isEmpty( strDate)) {                     SimpleDateFormat smf = new SimpleDateFormat(pattern , Locale.US);                     ParsePosition pos = new ParsePosition(0);                      smf.setLenient( false);                      return smf .parse(strDate , pos );              }               return null ;       }        public static java.sql.Date strToSqlDate(String strDate) {               return utilDateToSqlDate( strToUtilDate(strDate, DateUtil.CHS_DATE_FORMAT_MASK ));       }        public static java.sql.Date strToSqlDate(String strDate, String pattern) {               return utilDateToSqlDate( strToUtilDate(strDate, pattern));       }        public static Timestamp strToTimestamp(String strDate) {              java.util.Date date = strToUtilDate(strDate);               return utilDateToTimestamp( date);       }        public static Timestamp strToTimestamp(String strDate, String pattern) {              java.util.Date date = strToUtilDate(strDate, pattern);               return utilDateToTimestamp( date);       }        public static boolean isWeekEnd(java.util.Date strDate) {               if (strDate == null)                      return false ;               boolean bRtn = false;               int day_of_week = 1;              Calendar cal = Calendar. getInstance();               cal.setTime( strDate);               day_of_week = cal .get(Calendar.DAY_OF_WEEK);               if (day_of_week == Calendar.SUNDAY || day_of_week == Calendar.SATURDAY ) {                      bRtn = true;              }               return bRtn ;       }        public static int getLastDayOfMonth(java.util.Date date) {               int lastDay ;              Calendar cal = Calendar. getInstance();               cal.setTime( date);               int month = cal .get(Calendar.MONTH);        int year = cal .get(Calendar.YEAR);        boolean isLeapYear = ((GregorianCalendar) cal).isLeapYear( year);               if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {                      lastDay = 31;              } else if (month == 4 || month == 6 || month == 9 || month == 11) {                      lastDay = 31;              } else if (month == 2 && isLeapYear) {                      lastDay = 29;              } else {                      lastDay = 28;              }               return lastDay ;       }        public static final Timestamp getTimeAfter(Timestamp date, int field , int amount) {              Calendar cal = Calendar. getInstance();               cal.setTime( date);               cal.add( field, amount);               return utilDateToTimestamp( cal.getTime());       }        public static final Timestamp getTimeBefore(Timestamp date, int field , int amount) {               return getTimeAfter( date, field, - amount);       }        public static final java.sql.Date getDateAfter(java.sql.Date date, int field, int amount ) {              Calendar cal = Calendar. getInstance();               cal.setTime( date);               cal.add( field, amount);               return utilDateToSqlDate( cal.getTime());       }        public static final java.sql.Date getDateBefore(java.sql.Date date, int field, int amount ) {               return getDateAfter( date, field, - amount);       }        public static final java.sql.Date getNextDay(java.sql.Date date) {               return getDateAfter( date, Calendar. DAY_OF_YEAR, 1);       }        public static final java.sql.Date getPreviousDay(java.sql.Date date) {               return getDateBefore( date, Calendar. DAY_OF_YEAR, 1);       }        public static final java.util.Date getDate(java.util.Date date) {              Calendar cal = Calendar. getInstance();               cal.setTime( date);               cal.set(Calendar. AM_PM, Calendar.AM);               cal.set(Calendar. HOUR, 0);               cal.set(Calendar. MINUTE, 0);               cal.set(Calendar. SECOND, 0);               cal.set(Calendar. MILLISECOND, 0);               return cal .getTime();       }        public static final java.sql.Timestamp getDate(java.sql.Timestamp origTs) {              java.sql.Timestamp newTs = null;              Calendar c = Calendar. getInstance();               c.setTime( origTs);               c.set(Calendar. SECOND, 0);               c.set(Calendar. HOUR_OF_DAY, 0);               c.set(Calendar. MINUTE, 0);               c.set(Calendar. MILLISECOND, 0);               newTs = new java.sql.Timestamp(c .getTime().getTime());               return newTs ;       }        public static String toString(java.sql.Timestamp timestamp, String pattern) {               if (StringUtil.isEmpty( pattern))                      pattern = DateUtil. CHS_DATE_FORMAT_MASK;              SimpleDateFormat sdf = new SimpleDateFormat(pattern , Locale.US);              String dateString = null ;               if (timestamp != null)                      dateString = sdf .format(timestamp );               return dateString ;       }        public static String toString(java.util.Date date, String pattern) {               if (StringUtil.isEmpty( pattern))                      pattern = DateUtil. CHS_DATE_FORMAT_MASK;              SimpleDateFormat sdf = new SimpleDateFormat(pattern , Locale.US);              String dateString = null ;               if (date != null)                      dateString = sdf .format(date );               return dateString ;       }}
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