java日期处理bean

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java日期处理bean
Java code
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();    }