文件名称：java时间处理工具类--DateUtils
文件大小：2KB
文件格式：RAR
更新时间：2013-02-03 12:23:39
java.date,时间处理,String转Date,Date转String
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); } }
【文件预览】：
DateUtils.java