java日期工具类

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package my.common.utils;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import org.apache.commons.lang.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;/** *日期处理工具类. */public class DateUtil {    private static final transient Log log = LogFactory.getLog(DateUtil.class);    /**     * 缺省的日期格式     */    private static final String DAFAULT_DATE_FORMAT = "yyyy-M-d";    private static final String DATE_FORMAT = "yyyy-MM-dd";    /**     * 默认日期类型格试.     *      * @see DAFAULT_DATE_FORMAT     */    private static SimpleDateFormat dateFormat = new SimpleDateFormat(DAFAULT_DATE_FORMAT);    /**     * 缺省的日期时间格式     */    private static final String DAFAULT_DATETIME_FORMAT = "yyyy-M-d HH:mm:ss";    /**     * 时间格式     */    private static String DATETIME_FORMAT = DAFAULT_DATETIME_FORMAT;    private static SimpleDateFormat datetimeFormat = new SimpleDateFormat(DATETIME_FORMAT);    /**     * 缺省的时间格式     */    private static final String DAFAULT_TIME_FORMAT = "HH:mm:ss";    /**     * 时间格式     */    private static String TIME_FORMAT = DAFAULT_TIME_FORMAT;    private static SimpleDateFormat timeFormat = new SimpleDateFormat(TIME_FORMAT);    private DateUtil()    {        // 私用构造主法.因为此类是工具类.    }    /**     * 获取格式化实例.     *      * @param pattern     *            如果为空使用DAFAULT_DATE_FORMAT     * @return     */    public static SimpleDateFormat getFormatInstance(String pattern) {        if (pattern == null || pattern.length() == 0)        {            pattern = DAFAULT_DATE_FORMAT;        }        return new SimpleDateFormat(pattern);    }    /**     * 格式化Calendar     *      * @param calendar     * @return     */    public static String formatCalendar(Calendar calendar) {        if (calendar == null)        {            return "";        }        return dateFormat.format(calendar.getTime());    }    public static String formatDateTime(Date d) {        if (d == null)        {            return "";        }        return datetimeFormat.format(d);    }    public static String formatDate(Date d) {        if (d == null)        {            return "";        }        return dateFormat.format(d);    }    /**     * 格式化时间     *      * @param calendar     * @return     */    public static String formatTime(Date d) {        if (d == null)        {            return "";        }        return timeFormat.format(d);    }    /**     * 格式化整数型日期     *      * @param intDate     * @return     */    public static String formatIntDate(Integer intDate) {        if (intDate == null)        {            return "";        }        Calendar c = newCalendar(intDate);        return formatCalendar(c);    }    /**     * 根据指定格式化来格式日期.     *      * @param date     *            待格式化的日期.     * @param pattern     *            格式化样式或分格,如yyMMddHHmmss     * @return 字符串型日期.     */    public static String formatDate(Date date, String pattern) {        if (date == null)        {            return "";        }        if (StringUtils.isBlank(pattern))        {            return formatDate(date);        }        SimpleDateFormat simpleDateFormat = null;        try        {            simpleDateFormat = new SimpleDateFormat(pattern);        } catch (Exception e)        {            e.printStackTrace();            return formatDate(date);        }        return simpleDateFormat.format(date);    }    /**     * 取得Integer型的当前日期     *      * @return     */    public static Integer getIntNow() {        return getIntDate(getNow());    }    /**     * 取得Integer型的当前日期     *      * @return     */    public static Integer getIntToday() {        return getIntDate(getNow());    }    /**     * 取得Integer型的当前年份     *      * @return     */    public static Integer getIntYearNow() {        Calendar c = Calendar.getInstance();        int year = c.get(Calendar.YEAR);        return year;    }    /**     * 取得Integer型的当前月份     *      * @return     */    public static Integer getIntMonthNow() {        Calendar c = Calendar.getInstance();        int month = c.get(Calendar.MONTH) + 1;        return month;    }    public static String getStringToday() {        return getIntDate(getNow()) + "";    }    /**     * 根据年月日获取整型日期     *      * @param year     * @param month     * @param day     * @return     */    public static Integer getIntDate(int year, int month, int day) {        return getIntDate(newCalendar(year, month, day));    }    /**     * 某年月的第一天     *      * @param year     * @param month     * @return     */    public static Integer getFirstDayOfMonth(int year, int month) {        return getIntDate(newCalendar(year, month, 1));    }    /**     * 某年月的第一天     *      * @param year     * @param month     * @return     */    public static Integer getFirstDayOfThisMonth() {        Integer year = DateUtil.getIntYearNow();        Integer month = DateUtil.getIntMonthNow();        return getIntDate(newCalendar(year, month, 1));    }    /**     * 某年月的第一天     *      * @param date     * @return     * @time:2008-7-4 上午09:58:55     */    public static Integer getFistDayOfMonth(Date date) {        Integer intDate = getIntDate(date);        int year = intDate / 10000;        int month = intDate % 10000 / 100;        return getIntDate(newCalendar(year, month, 1));    }    /**     * 某年月的最后一天     *      * @param year     * @param month     * @return     */    public static Integer getLastDayOfMonth(int year, int month) {        return intDateSub(getIntDate(newCalendar(year, month + 1, 1)), 1);    }    /**     * 根据Calendar获取整型年份     *      * @param c     * @return     */    public static Integer getIntYear(Calendar c) {        int year = c.get(Calendar.YEAR);        return year;    }    /**     * 根据Calendar获取整型日期     *      * @param c     * @return     */    public static Integer getIntDate(Calendar c) {        int year = c.get(Calendar.YEAR);        int month = c.get(Calendar.MONTH) + 1;        int day = c.get(Calendar.DAY_OF_MONTH);        return year * 10000 + month * 100 + day;    }    /**     * 根据Date获取整型年份     *      * @param d     * @return     */    public static Integer getIntYear(Date d) {        if (d == null)        {            return null;        }        Calendar c = Calendar.getInstance();        c.setTime(d);        return getIntYear(c);    }    /**     * 根据Date获取整型日期     *      * @param d     * @return     */    public static Integer getIntDate(Date d) {        if (d == null)        {            return null;        }        Calendar c = Calendar.getInstance();        c.setTime(d);        return getIntDate(c);    }    /**     * 根据Integer获取Date日期     *      * @param n     * @return     */    public static Date getDate(Integer n) {        if (n == null)        {            return null;        }        Calendar c = Calendar.getInstance();        c.set(n / 10000, n / 100 % 100 - 1, n % 100);        return c.getTime();    }    public static Date getDate(String date) {        if (date == null || date.length() == 0)        {            return null;        }        try        {            if (date.contains("/"))            {                date = date.replaceAll("/", "-");            }            return getFormatInstance(DATE_FORMAT).parse(date);        } catch (ParseException e)        {            log.error("解析[" + date + "]错误！", e);            return null;        }    }    /**     * 根据年份Integer获取Date日期     *      * @param year     * @return     */    public static Date getFirstDayOfYear(Integer year) {        if (year == null)        {            return null;        }        Calendar c = Calendar.getInstance();        c.set(year, 1, 1);        return c.getTime();    }    /**     * 根据年月日生成Calendar     *      * @param year     * @param month     * @param day     * @return     */    public static Calendar newCalendar(int year, int month, int day) {        Calendar ret = Calendar.getInstance();        if (year < 100)        {            year = 2000 + year;        }        ret.set(year, month - 1, day);        return ret;    }    /**     * 根据整型日期生成Calendar     *      * @param date     * @return     */    public static Calendar newCalendar(int date) {        int year = date / 10000;        int month = (date % 10000) / 100;        int day = date % 100;        Calendar ret = Calendar.getInstance();        ret.set(year, month - 1, day);        return ret;    }    /**     * 取得Date型的当前日期     *      * @return     */    public static Date getNow() {        return new Date();    }    /**     * 取得Date型的当前日期     *      * @return     */    public static Date getToday() {        return DateUtil.getDate(DateUtil.getIntToday());    }    /**     * 整数型日期的加法     *      * @param date     * @param days     * @return     */    public static Integer intDateAdd(int date, int days) {        int year = date / 10000;        int month = (date % 10000) / 100;        int day = date % 100;        day += days;        return getIntDate(year, month, day);    }    /**     * 整数型日期的减法     *      * @param date     * @param days     * @return     */    public static Integer intDateSub(int date, int days) {        return intDateAdd(date, -days);    }    /**     * 计算两个整型日期之间的天数     *      * @param startDate     * @param endDate     * @return     */    public static Integer daysBetweenDate(Integer startDate, Integer endDate) {        if (startDate == null || endDate == null)        {            return null;        }        Calendar c1 = newCalendar(startDate);        Calendar c2 = newCalendar(endDate);        Long lg = (c2.getTimeInMillis() - c1.getTimeInMillis()) / 1000 / 60 / 60 / 24;        return lg.intValue();    }    /**     * 计算两个整型日期之间的天数     *      * @param startDate     * @param endDate     * @return     */    public static Integer daysBetweenDate(Date startDate, Date endDate) {        if (startDate == null || endDate == null)        {            return null;        }        Long interval = endDate.getTime() - startDate.getTime();        interval = interval / (24 * 60 * 60 * 1000);        return interval.intValue();    }    /**     * 取得当前日期.     *      * @return 当前日期,字符串类型.     */    public static String getStringDate() {        return getStringDate(DateUtil.getNow());    }    /**     * 根据calendar产生字符串型日期     *      * @param d     * @return eg:20080707     */    public static String getStringDate(Date d) {        if (d == null)        {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");        return sdf.format(d);    }    public static String getFormatStringDate(Date d) {        if (d == null)        {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");        return sdf.format(d);    }    // /**    // * 国际化。    // */    // public static String formatI18nDate(Date date){    // if(date == null){    // return "";    // }    // ActionSupport actionSupport = new ActionSupport();    // SimpleDateFormat sdf = new    // SimpleDateFormat(actionSupport.getText("date.i18n.format"));    // return sdf.format(date);    // }}
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