java日期工具类

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import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.regex.Matcher;import java.util.regex.Pattern;public class DateUtil {    public static final String FormatDayToChinaTime24H = "yyyy年MM月dd日";public static String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";public static String DATE_FORMAT = "yyyy-MM-dd";public static String TIME_FORMAT = "HH:mm:ss";/** * 返回年份 *  * @param date *            日期 * @return 返回年份 */public static int getYear(Date date) {java.util.Calendar c = java.util.Calendar.getInstance();c.setTime(date);return c.get(java.util.Calendar.YEAR);}/** * 返回月份 *  * @param date *            日期 * @return 返回月份 */public static int getMonth(Date date) {java.util.Calendar c = java.util.Calendar.getInstance();c.setTime(date);return c.get(java.util.Calendar.MONTH) + 1;}/** * 返回日份 *  * @param date *            日期 * @return 返回日份 */public static int getDay(Date date) {java.util.Calendar c = java.util.Calendar.getInstance();c.setTime(date);return c.get(java.util.Calendar.DAY_OF_MONTH);}/** * Parse date like "yyyy-MM-dd". */public static Date parseDate(String d) {try {return new SimpleDateFormat(DATE_FORMAT).parse(d);} catch (Exception e) {}return null;}/** * Parse date like "yyyy-MM-dd HH:mm:ss". */public static Date parseDateTime(String d) {try {return new SimpleDateFormat(DATETIME_FORMAT).parse(d);} catch (Exception e) {}return null;}/** * Parse date like "HH:mm:ss". */public static Date parseTime(String d) {try {return new SimpleDateFormat(TIME_FORMAT).parse(d);} catch (Exception e) {}return null;}/** * 取得指定月份的最后一天 *  * @param strdate *            String * @return String */public String getMonthEnd(String strdate) {Date date = parseDate(getMonthBegin(strdate));Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.MONTH, 1);calendar.add(Calendar.DAY_OF_YEAR, -1);return formatDate(calendar.getTime());}/** * 取得指定月份的第一天 *  * @param strdate *            String * @return String */public String getMonthBegin(String strdate) {Date date = parseDate(strdate);return formatDateByFormat(date, "yyyy-MM") + "-01";}/** * 以指定的格式来格式化日期 *  * @param date *            Date * @param format *            String * @return String */public static String formatDateByFormat(Date date, String format) {String result = "";if (date != null) {try {SimpleDateFormat sdf = new SimpleDateFormat(format);result = sdf.format(date);} catch (Exception ex) {ex.printStackTrace();}}return result;}/** * 常用的格式化日期 *  * @param date *            Date * @return String */public String formatDate(Date date) {return formatDateByFormat(date, "yyyy-MM-dd");}/** * @根据当前日期计算n天后的日期 * @return String */public Date afterNDay(Date date, int n) {Calendar c = Calendar.getInstance();c.setTime(date);c.add(Calendar.DATE, n);Date destDay = c.getTime();return destDay;}/** * 两个日期间的天数 */public static int getIntervalDays(Date startday, Date endday) {if (startday.after(endday)) {Date cal = startday;startday = endday;endday = cal;}long sl = startday.getTime();long el = endday.getTime();long ei = el - sl;return (int) (ei / (1000 * 60 * 60 * 24));}        public static boolean  verifyDate(String birthday){    String [] array = birthday.split("-");    if(null == array || array.length != 3 || array[0].length() !=4 || array[1].length() != 2 || array[2].length() != 2)     return false;    int curyear = DateUtil.getYear(new Date());    try {int studyear = Integer.parseInt(array[0]);if(studyear <= 1900 || studyear > curyear)return false;String curDateStr = formatDateByFormat(new Date(), DATE_FORMAT);if(birthday.compareTo(curDateStr) >= 0) return false;return checkDate(birthday);} catch (NumberFormatException e) {return false;}    }        private static boolean checkDate(String date) {// System.out.println(date);// 判断年月日的正则表达式，接受输入格式为2010-12-24，可接受平年闰年的日期String regex = "(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)";Pattern pattern = Pattern.compile(regex);Matcher matcherObj = pattern.matcher(date);return matcherObj.matches();}        public static void main(String [] args) {    //System.out.println(verifyDate("2012-09-27"));    String test = ",1.1,1.2,1.3,";System.out.println(test.split(",").length);    }}
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