操作日期的基础类

import java.sql.Timestamp;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Locale;import org.apache.commons.logging.Log;/** * 2005-7-26 14:41:31 */public class DateUtility { // private static Log log = LogUtil.getLoger(DateUtility.class); private static final long ONE_DAY = 86400000l; /** * 获取当前日期字符串 格式为YYYY-MM-DD * * @return java.lang.String */ public static String getCurrentDate() { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); String s = df.format(new Date()); return s; } /** * 得到当前年，格式如：2008 * @return */ public static String getCurrentYear() { SimpleDateFormat df = new SimpleDateFormat("yyyy"); String s = df.format(new Date()); return s; } /** * 得到当前月，格式如：02 * @return */ public static String getCurrentMonth() { SimpleDateFormat df = new SimpleDateFormat("MM"); String s = df.format(new Date()); return s; } public static String getDayInWeek(String sDate) { Date date = strToDate(sDate); SimpleDateFormat df = new SimpleDateFormat("EEE"); String s = df.format(date); return s; } /** * 返回日期类型 * @param str * @return */ public static Date strToDate(String str) { Date date = null; if (str != null) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); try { date = df.parse(str); } catch (ParseException e) { //log.error("DateParse Error!"); } } return date; } /** * 返回日期类型 * @param str * @return */ public static Date strToDateTime(String str) { Date date = null; if (str != null) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { date = df.parse(str); } catch (ParseException e) { //log.error("DateParse Error!"); } } return date; } public static String dateTimeToStr(Date date) { String str = null; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); if (date != null) { str = df.format(date); } return str; } public static String dateToStr(Date date) { String str = null; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); if (date != null) { str = df.format(date); } return str; } /** * 转化成中文类型的日期 * @param date * @return */ public static String dateToStrCh(Date date) { String str = null; SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日"); if (date != null) { str = df.format(date); } return str; } /** * 在原有的日期上面加i天 * @param date * @param i * @return */ public static Date add(Date date, int i) { date = new Date(date.getTime() + i * ONE_DAY); return date; } /** * 加1天 * @param date * @return */ public static Date add(Date date) { return add(date, 1); } /** * 减1天 * @param date * @return */ public static Date sub(Date date) { return add(date, -1); } public static String getBeforeDate() { Date date = DateUtility.sub(new Date()); return DateUtility.dateToStr(date); } /** * 得到当前时间，格式：yyyy-MM-dd HH:mm:ss * @return */ public static String getCurrentDateTime() { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String s = df.format(new Date()); return s; } /** * 得到当前时间（星期），格式：yyyy年MM月dd日 EEE * @return */ public static String getCurrentDateWeek() { SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月dd日 EEE"); String s = df.format(new Date()); return s; } /** * 得到当前时间（星期），格式：EEE, d MMM yyyy * @return */ public static String getCurrentDateWeekEn() { SimpleDateFormat df = new SimpleDateFormat("EEE, d MMM yyyy ", new Locale("en")); String s = df.format(new Date()); return s; } /** * 返回月份之间的差。 * @param startYear * @param startMonth * @param endYear * @param endMonth * @return */ public static int compareMonth(String startYear, String startMonth, String endYear, String endMonth) { return (Integer.parseInt(endYear) - Integer.parseInt(startYear)) * 12 + (Integer.parseInt(endMonth) - Integer.parseInt(startMonth)); } /** * * @param sDate * @return */ public static String getYearMonth(String sDate) { Date date1 = null; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); String s = null; try { date1 = df.parse(sDate); df.applyPattern("yyMM"); s = df.format(date1); } catch (ParseException e) { return s; } return s; } /** * * @param date * @return */ public static String getYearMonth(Date date) { SimpleDateFormat df = new SimpleDateFormat("yyMM"); String s = null; s = df.format(date); return s; } public static String getMonthDay(Date date) { SimpleDateFormat df = new SimpleDateFormat("MM月dd日"); String s = null; s = df.format(date); return s; } public static String getYearMonthDay(String sDate) { Date date1 = null; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); String s = null; try { date1 = df.parse(sDate); df.applyPattern("yyMMdd"); s = df.format(date1); } catch (ParseException e) { return s; } return s; } public static String getStartQueryTime(String date) { return DateUtility.dateToStr(DateUtility.strToDate(date)) + " 00:00:00"; } public static String getEndQueryTime(String date) { return DateUtility.dateToStr(DateUtility.strToDate(date)) + " 23:59:59"; } /** * * @param sDate * @return */ public static String getMonth(String sDate) { Date date1 = null; SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd"); String s = null; try { date1 = df.parse(sDate); df.applyPattern("MM"); s = df.format(date1); } catch (ParseException e) { return s; } return s; } /** * * @param sDate1 * @param sDate2 * @return */ public static int compareDate(String sDate1, String sDate2) { Date date1 = null; Date date2 = null; SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); try { date1 = dateFormat.parse(sDate1); date2 = dateFormat.parse(sDate2); } catch (ParseException e) { } long dif = 0; if (date2.after(date1)) dif = (date2.getTime() - date1.getTime()) / 1000 / 60 / 60 / 24; else dif = (date1.getTime() - date2.getTime()) / 1000 / 60 / 60 / 24; return (int) dif; } public static int getDate(String sDate, String sTag) { int iSecondMinusPos = sDate.lastIndexOf('-'); if (sTag.equalsIgnoreCase("y")) { return Integer.parseInt(sDate.substring(0, 4)); } else if (sTag.equalsIgnoreCase("m")) { return Integer.parseInt(sDate.substring(5, iSecondMinusPos)); } else return Integer.parseInt(sDate.substring(iSecondMinusPos + 1)); } public static int getDayOfWeek() { Calendar toDay = Calendar.getInstance(); toDay.setFirstDayOfWeek(Calendar.MONDAY); int ret = toDay.get(Calendar.DAY_OF_WEEK) - 1; if (ret == 0) { ret = 7; } return ret; } public static String getFirstDayOfMonth() { Calendar ca = Calendar.getInstance(); ca.setTime(new Date()); // someDate 为你要获取的那个月的时间 ca.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = ca.getTime(); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(firstDate); } public static String getFirstDayOfMonth(java.util.Calendar ca) { // Calendar ca = Calendar.getInstance(); // ca.setTime(new Date()); // someDate 为你要获取的那个月的时间 ca.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = ca.getTime(); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(firstDate); } /** * @author 包忠华 * @description 获取当前时间的下一年 * @return String */ public static String getNextYearDate() { Calendar ca = Calendar.getInstance(); ca.setTime(new Date()); // someDate 为你要获取的那个月的时间 ca.set(Calendar.DAY_OF_MONTH, 1); ca.add(Calendar.YEAR, 1); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(lastDate); } public static String getNextYearDateBystr(String str) { Date d=DateUtility.strToDate(str); Calendar ca = Calendar.getInstance(); ca.setTime(d); ca.set(Calendar.DAY_OF_MONTH, 1); ca.add(Calendar.YEAR, 1); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(lastDate); } public static String getLastDayOfMonth() { Calendar ca = Calendar.getInstance(); ca.setTime(new Date()); // someDate 为你要获取的那个月的时间 ca.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = ca.getTime(); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(lastDate); } public static String getLastDayOfMonth(Calendar ca) {// Calendar ca = Calendar.getInstance(); // ca.setTime(new Date()); // someDate 为你要获取的那个月的时间 ca.set(Calendar.DAY_OF_MONTH, 1); Date firstDate = ca.getTime(); ca.add(Calendar.MONTH, 1); ca.add(Calendar.DAY_OF_MONTH, -1); Date lastDate = ca.getTime(); return dateToStr(lastDate); } public static String getDayInWeek() { Calendar ca = Calendar.getInstance(); ca.setTime(new Date()); String ret = String.valueOf(ca.get(Calendar.DAY_OF_WEEK) - 1); return ret; } public static String getYearAndMonths(Date date) { SimpleDateFormat df = new SimpleDateFormat("yy-MM"); String s = null; s = df.format(date); return s; } public static String getYearAndMonth(Date date) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM"); String s = null; s = df.format(date); return s; } public final static Timestamp getTimeOfStr ( String dateStr ) { DateFormat df = new SimpleDateFormat ( "yyyy-MM" ); Timestamp time = null; try { java.util.Date da = df.parse ( dateStr ); time = new Timestamp ( da.getTime () ); } catch ( Exception e ) { e.printStackTrace (); } return time; }}