java时间处理工具类--DateUtils

package com.hexiang.utils;/** * @(#)DateUtil.java * * * @author kidd * @version 1.00 2007/8/8 */import java.util.*;import java.text.*;import java.sql.Timestamp;public class DateUtils {/** * 时间范围：年 */public static final int YEAR = 1;/** * 时间范围：季度 */public static final int QUARTER = 2;/** * 时间范围：月 */public static final int MONTH = 3;/** * 时间范围：旬 */public static final int TENDAYS = 4;/** * 时间范围：周 */public static final int WEEK = 5;/** * 时间范围：日 */public static final int DAY = 6;/* 基准时间 */private Date fiducialDate = null;private Calendar cal = null;private DateUtils(Date fiducialDate) {if (fiducialDate != null) {this.fiducialDate = fiducialDate;} else {this.fiducialDate = new Date(System.currentTimeMillis());}this.cal = Calendar.getInstance();this.cal.setTime(this.fiducialDate);this.cal.set(Calendar.HOUR_OF_DAY, 0);this.cal.set(Calendar.MINUTE, 0);this.cal.set(Calendar.SECOND, 0);this.cal.set(Calendar.MILLISECOND, 0);this.fiducialDate = this.cal.getTime();}/** * 获取DateHelper实例 *  * @param fiducialDate *            基准时间 * @return Date */public static DateUtils getInstance(Date fiducialDate) {return new DateUtils(fiducialDate);}/** * 获取DateHelper实例, 使用当前时间作为基准时间 *  * @return Date */public static DateUtils getInstance() {return new DateUtils(null);}/** * 获取年的第一天 *  * @param offset *            偏移量 * @return Date */public Date getFirstDayOfYear(int offset) {cal.setTime(this.fiducialDate);cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset);cal.set(Calendar.MONTH, Calendar.JANUARY);cal.set(Calendar.DAY_OF_MONTH, 1);return cal.getTime();}/** * 获取年的最后一天 *  * @param offset *            偏移量 * @return Date */public Date getLastDayOfYear(int offset) {cal.setTime(this.fiducialDate);cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset);cal.set(Calendar.MONTH, Calendar.DECEMBER);cal.set(Calendar.DAY_OF_MONTH, 31);return cal.getTime();}/** * 获取季度的第一天 *  * @param offset *            偏移量 * @return Date */public Date getFirstDayOfQuarter(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.MONTH, offset * 3);int mon = cal.get(Calendar.MONTH);if (mon >= Calendar.JANUARY && mon <= Calendar.MARCH) {cal.set(Calendar.MONTH, Calendar.JANUARY);cal.set(Calendar.DAY_OF_MONTH, 1);}if (mon >= Calendar.APRIL && mon <= Calendar.JUNE) {cal.set(Calendar.MONTH, Calendar.APRIL);cal.set(Calendar.DAY_OF_MONTH, 1);}if (mon >= Calendar.JULY && mon <= Calendar.SEPTEMBER) {cal.set(Calendar.MONTH, Calendar.JULY);cal.set(Calendar.DAY_OF_MONTH, 1);}if (mon >= Calendar.OCTOBER && mon <= Calendar.DECEMBER) {cal.set(Calendar.MONTH, Calendar.OCTOBER);cal.set(Calendar.DAY_OF_MONTH, 1);}return cal.getTime();}public Date getYesterday() {long time = this.fiducialDate.getTime() - 60 * 60 * 24 * 1000;return new Date(time);}public Date getTomorrow(){long time = this.fiducialDate.getTime() + 60 * 60 * 24 * 1000;return new Date(time);}/** * 获取季度的最后一天 *  * @param offset *            偏移量 * @return Date */public Date getLastDayOfQuarter(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.MONTH, offset * 3);int mon = cal.get(Calendar.MONTH);if (mon >= Calendar.JANUARY && mon <= Calendar.MARCH) {cal.set(Calendar.MONTH, Calendar.MARCH);cal.set(Calendar.DAY_OF_MONTH, 31);}if (mon >= Calendar.APRIL && mon <= Calendar.JUNE) {cal.set(Calendar.MONTH, Calendar.JUNE);cal.set(Calendar.DAY_OF_MONTH, 30);}if (mon >= Calendar.JULY && mon <= Calendar.SEPTEMBER) {cal.set(Calendar.MONTH, Calendar.SEPTEMBER);cal.set(Calendar.DAY_OF_MONTH, 30);}if (mon >= Calendar.OCTOBER && mon <= Calendar.DECEMBER) {cal.set(Calendar.MONTH, Calendar.DECEMBER);cal.set(Calendar.DAY_OF_MONTH, 31);}return cal.getTime();}/** * 获取月的最后一天 *  * @param offset *            偏移量 * @return Date */public Date getFirstDayOfMonth(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.MONTH, offset);cal.set(Calendar.DAY_OF_MONTH, 1);return cal.getTime();}/** * 获取月的最后一天 *  * @param offset *            偏移量 * @return Date */public Date getLastDayOfMonth(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.MONTH, offset + 1);cal.set(Calendar.DAY_OF_MONTH, 1);cal.add(Calendar.DAY_OF_MONTH, -1);return cal.getTime();}/** * 获取旬的第一天 *  * @param offset *            偏移量 * @return Date */public Date getFirstDayOfTendays(int offset) {cal.setTime(this.fiducialDate);int day = cal.get(Calendar.DAY_OF_MONTH);if (day >= 21) {day = 21;} else if (day >= 11) {day = 11;} else {day = 1;}if (offset > 0) {day = day + 10 * offset;int monOffset = day / 30;day = day % 30;cal.add(Calendar.MONTH, monOffset);cal.set(Calendar.DAY_OF_MONTH, day);} else {int monOffset = 10 * offset / 30;int dayOffset = 10 * offset % 30;if ((day + dayOffset) > 0) {day = day + dayOffset;} else {monOffset = monOffset - 1;day = day - dayOffset - 10;}cal.add(Calendar.MONTH, monOffset);cal.set(Calendar.DAY_OF_MONTH, day);}return cal.getTime();}/** * 获取旬的最后一天 *  * @param offset *            偏移量 * @return Date */public Date getLastDayOfTendays(int offset) {Date date = getFirstDayOfTendays(offset + 1);cal.setTime(date);cal.add(Calendar.DAY_OF_MONTH, -1);return cal.getTime();}/** * 获取周的第一天(MONDAY) *  * @param offset *            偏移量 * @return Date */public Date getFirstDayOfWeek(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.DAY_OF_MONTH, offset * 7);cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);return cal.getTime();}/** * 获取周的最后一天(SUNDAY) *  * @param offset *            偏移量 * @return Date */public Date getLastDayOfWeek(int offset) {cal.setTime(this.fiducialDate);cal.add(Calendar.DAY_OF_MONTH, offset * 7);cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);cal.add(Calendar.DAY_OF_MONTH, 6);return cal.getTime();}/** * 获取指定时间范围的第一天 *  * @param dateRangeType *            时间范围类型 * @param offset *            偏移量 * @return Date */public Date getFirstDate(int dateRangeType, int offset) {return null;}/** * 获取指定时间范围的最后一天 *  * @param dateRangeType *            时间范围类型 * @param offset *            偏移量 * @return Date */public Date getLastDate(int dateRangeType, int offset) {return null;}/** * 根据日历的规则，为基准时间添加指定日历字段的时间量 *  * @param field *            日历字段, 使用Calendar类定义的日历字段常量 * @param offset *            偏移量 * @return Date */public Date add(int field, int offset) {cal.setTime(this.fiducialDate);cal.add(field, offset);return cal.getTime();}/** * 根据日历的规则，为基准时间添加指定日历字段的单个时间单元 *  * @param field *            日历字段, 使用Calendar类定义的日历字段常量 * @param up *            指定日历字段的值的滚动方向。true:向上滚动 / false:向下滚动 * @return Date */public Date roll(int field, boolean up) {cal.setTime(this.fiducialDate);cal.roll(field, up);return cal.getTime();}/** * 把字符串转换为日期 *  * @param dateStr *            日期字符串 * @param format *            日期格式 * @return Date */public static Date strToDate(String dateStr, String format) {Date date = null;if (dateStr != null && (!dateStr.equals(""))) {DateFormat df = new SimpleDateFormat(format);try {date = df.parse(dateStr);} catch (ParseException e) {e.printStackTrace();}}return date;}/** * 把字符串转换为日期，日期的格式为yyyy-MM-dd HH:ss *  * @param dateStr *            日期字符串 * @return Date */public static Date strToDate(String dateStr) {Date date = null;if (dateStr != null && (!dateStr.equals(""))) {if (dateStr.matches("\\d{4}-\\d{1,2}-\\d{1,2}")) {dateStr = dateStr + " 00:00";} else if (dateStr.matches("\\d{4}-\\d{1,2}-\\d{1,2} \\d{1,2}")) {dateStr = dateStr + ":00";} else {System.out.println(dateStr + " 格式不正确");return null;}DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:ss");try {date = df.parse(dateStr);} catch (ParseException e) {e.printStackTrace();}}return date;}/** * 把日期转换为字符串 *  * @param date *            日期实例 * @param format *            日期格式 * @return Date */public static String dateToStr(Date date, String format) {return (date == null) ? "" : new SimpleDateFormat(format).format(date);}public static String dateToStr(Date date) {return (date == null) ? "": new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(date);}/** * 取得当前日期 年-月-日 *  * @return Date */public static String getCurrentDate() {DateFormat f = new SimpleDateFormat("yyyy-MM-dd");return f.format(Calendar.getInstance().getTime());}public static void main(String[] args) {DateUtils dateHelper = DateUtils.getInstance();/* Year */for (int i = -5; i <= 5; i++) {System.out.println("FirstDayOfYear(" + i + ") = "+ dateHelper.getFirstDayOfYear(i));System.out.println("LastDayOfYear(" + i + ") = "+ dateHelper.getLastDayOfYear(i));}/* Quarter */for (int i = -5; i <= 5; i++) {System.out.println("FirstDayOfQuarter(" + i + ") = "+ dateHelper.getFirstDayOfQuarter(i));System.out.println("LastDayOfQuarter(" + i + ") = "+ dateHelper.getLastDayOfQuarter(i));}/* Month */for (int i = -5; i <= 5; i++) {System.out.println("FirstDayOfMonth(" + i + ") = "+ dateHelper.getFirstDayOfMonth(i));System.out.println("LastDayOfMonth(" + i + ") = "+ dateHelper.getLastDayOfMonth(i));}/* Week */for (int i = -5; i <= 5; i++) {System.out.println("FirstDayOfWeek(" + i + ") = "+ dateHelper.getFirstDayOfWeek(i));System.out.println("LastDayOfWeek(" + i + ") = "+ dateHelper.getLastDayOfWeek(i));}/* Tendays */for (int i = -5; i <= 5; i++) {System.out.println("FirstDayOfTendays(" + i + ") = "+ dateHelper.getFirstDayOfTendays(i));System.out.println("LastDayOfTendays(" + i + ") = "+ dateHelper.getLastDayOfTendays(i));}}/** * 取当前日期的字符串形式,"XXXX年XX月XX日" *  * @return java.lang.String */public static String getPrintDate() {String printDate = "";Calendar calendar = Calendar.getInstance();calendar.setTime(new Date());printDate += calendar.get(Calendar.YEAR) + "年";printDate += (calendar.get(Calendar.MONTH) + 1) + "月";printDate += calendar.get(Calendar.DATE) + "日";return printDate;}/** * 将指定的日期字符串转化为日期对象 *  * @param dateStr *            日期字符串 * @return java.util.Date */public static Date getDate(String dateStr, String format) {if (dateStr == null) {return new Date();}if (format == null) {format = "yyyy-MM-dd";}SimpleDateFormat sdf = new SimpleDateFormat(format);try {Date date = sdf.parse(dateStr);return date;} catch (Exception e) {return null;}}/** * 从指定Timestamp中得到相应的日期的字符串形式 日期"XXXX-XX-XX" *  * @param dateTime * @return 、String */public static String getDateFromDateTime(Timestamp dateTime) {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");return sdf.format(dateTime).toString();}/** * 得到当前时间 return java.sql.Timestamp *  * @return Timestamp */public static Timestamp getNowTimestamp() {long curTime = System.currentTimeMillis();return new Timestamp(curTime);}}