java日期处理bean
import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.regex.Pattern; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class DateUtil { protected static Log logger = LogFactory.getLog(DateUtil.class); // 格式：年－月－日 小时：分钟：秒 public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss"; // 格式：年－月－日 小时：分钟 public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm"; // 格式：年月日 小时分钟秒 public static final String FORMAT_THREE = "yyyyMMdd-HHmmss"; // 格式：年－月－日 public static final String LONG_DATE_FORMAT = "yyyy-MM-dd"; // 格式：月－日 public static final String SHORT_DATE_FORMAT = "MM-dd"; // 格式：小时：分钟：秒 public static final String LONG_TIME_FORMAT = "HH:mm:ss"; //格式：年-月 public static final String MONTG_DATE_FORMAT = "yyyy-MM"; // 年的加减 public static final int SUB_YEAR = Calendar.YEAR; // 月加减 public static final int SUB_MONTH = Calendar.MONTH; // 天的加减 public static final int SUB_DAY = Calendar.DATE; // 小时的加减 public static final int SUB_HOUR = Calendar.HOUR; // 分钟的加减 public static final int SUB_MINUTE = Calendar.MINUTE; // 秒的加减 public static final int SUB_SECOND = Calendar.SECOND; static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; @SuppressWarnings("unused") private static final SimpleDateFormat timeFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); public DateUtil() { } /** * 把符合日期格式的字符串转换为日期类型 */ public static java.util.Date stringtoDate(String dateStr, String format) { Date d = null; SimpleDateFormat formater = new SimpleDateFormat(format); try { formater.setLenient(false); d = formater.parse(dateStr); } catch (Exception e) { // log.error(e); d = null; } return d; } /** * 把符合日期格式的字符串转换为日期类型 */ public static java.util.Date stringtoDate(String dateStr, String format, ParsePosition pos) { Date d = null; SimpleDateFormat formater = new SimpleDateFormat(format); try { formater.setLenient(false); d = formater.parse(dateStr, pos); } catch (Exception e) { d = null; } return d; } /** * 把日期转换为字符串 */ public static String dateToString(java.util.Date date, String format) { String result = ""; SimpleDateFormat formater = new SimpleDateFormat(format); try { result = formater.format(date); } catch (Exception e) { // log.error(e); } return result; } /** * 获取当前时间的指定格式 */ public static String getCurrDate(String format) { return dateToString(new Date(), format); } public static String dateSub(int dateKind, String dateStr, int amount) { Date date = stringtoDate(dateStr, FORMAT_ONE); Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(dateKind, amount); return dateToString(calendar.getTime(), FORMAT_ONE); } /** * 两个日期相减 * @return 相减得到的秒数 */ public static long timeSub(String firstTime, String secTime) { long first = stringtoDate(firstTime, FORMAT_ONE).getTime(); long second = stringtoDate(secTime, FORMAT_ONE).getTime(); return (second - first) / 1000; } /** * 获得某月的天数 */ public static int getDaysOfMonth(String year, String month) { int days = 0; if (month.equals("1") || month.equals("3") || month.equals("5") || month.equals("7") || month.equals("8") || month.equals("10") || month.equals("12")) { days = 31; } else if (month.equals("4") || month.equals("6") || month.equals("9") || month.equals("11")) { days = 30; } else { if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0) || Integer.parseInt(year) % 400 == 0) { days = 29; } else { days = 28; } } return days; } /** * 获取某年某月的天数 */ public static int getDaysOfMonth(int year, int month) { Calendar calendar = Calendar.getInstance(); calendar.set(year, month - 1, 1); return calendar.getActualMaximum(Calendar.DAY_OF_MONTH); } /** * 获得当前日期 */ public static int getToday() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.DATE); } /** * 获得当前月份 */ public static int getToMonth() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.MONTH) + 1; } /** * 获得当前年份 */ public static int getToYear() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.YEAR); } /** * 返回日期的天 */ public static int getDay(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar.get(Calendar.DATE); } /** * 返回日期的年 */ public static int getYear(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar.get(Calendar.YEAR); } /** * 返回日期的月份，1-12 */ public static int getMonth(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar.get(Calendar.MONTH) + 1; } /** * 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数 */ public static long dayDiff(Date date1, Date date2) { return (date2.getTime() - date1.getTime()) / 86400000; } /** * 比较两个日期的年差 */ public static int yearDiff(String before, String after) { Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT); Date afterDay = stringtoDate(after, LONG_DATE_FORMAT); return getYear(afterDay) - getYear(beforeDay); } /** * 比较指定日期与当前日期的差 */ public static int yearDiffCurr(String after) { Date beforeDay = new Date(); Date afterDay = stringtoDate(after, LONG_DATE_FORMAT); return getYear(beforeDay) - getYear(afterDay); } /** * 比较指定日期与当前日期的差 */ public static long dayDiffCurr(String before) { Date currDate = DateUtil.stringtoDate(currDay(), LONG_DATE_FORMAT); Date beforeDate = stringtoDate(before, LONG_DATE_FORMAT); return (currDate.getTime() - beforeDate.getTime()) / 86400000; } /** * 获取每月的第一周 */ public static int getFirstWeekdayOfMonth(int year, int month) { Calendar c = Calendar.getInstance(); c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天 c.set(year, month - 1, 1); return c.get(Calendar.DAY_OF_WEEK); } /** * 获取每月的最后一周 */ public static int getLastWeekdayOfMonth(int year, int month) { Calendar c = Calendar.getInstance(); c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天 c.set(year, month - 1, getDaysOfMonth(year, month)); return c.get(Calendar.DAY_OF_WEEK); } /** * 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss" * * @return */ public static String getCurrent() { Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); int year = cal.get(Calendar.YEAR); int month = cal.get(Calendar.MONTH) + 1; int day = cal.get(Calendar.DAY_OF_MONTH); int hour = cal.get(Calendar.HOUR_OF_DAY); int minute = cal.get(Calendar.MINUTE); int second = cal.get(Calendar.SECOND); StringBuffer sb = new StringBuffer(); sb.append(year).append("_").append(StringUtil.addzero(month, 2)) .append("_").append(StringUtil.addzero(day, 2)).append("_") .append(StringUtil.addzero(hour, 2)).append("_").append( StringUtil.addzero(minute, 2)).append("_").append( StringUtil.addzero(second, 2)); return sb.toString(); } /** * 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss" * * @return */ public static String getNow() { Calendar today = Calendar.getInstance(); return dateToString(today.getTime(), FORMAT_ONE); } /** * 判断日期是否有效,包括闰年的情况 * * @param date * YYYY-mm-dd * @return */ public static boolean isDate(String date) { StringBuffer reg = new StringBuffer( "^((\\d{2}(([02468][048])|([13579][26]))-?((((0?"); reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))"); reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|"); reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12"); reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))"); reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))"); reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?["); reg.append("1-9])|(1[0-9])|(2[0-8]))))))"); Pattern p = Pattern.compile(reg.toString()); return p.matcher(date).matches(); }
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