java 日期工具类

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package app.ck.cuit.web.util;import java.io.Serializable;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * 日期工具类 *  * @author ck *  */public class DateUtils implements Serializable {    /** *  */    private static final long serialVersionUID = -7968262747262488161L;    public final static String YYYYMMDDHHMMSS = "yyyy-MM-dd HH:mm:ss";    public final static String YYYYMMDDHHMM = "yyyy-MM-dd HH:mm";    public final static String YYYYMMDDHHMMSS_CONTINUS = "yyyyMMddHHmmss";    public static final String YYYYMMDD = "yyyy-MM-dd";    public static final String YYYY = "yyyy";    public static final String YYYYMM = "yyyy-MM";    public static final String YYMM = "yyMM";    public static final String HHmm = "HH:mm";    /**     * 将日期转换成字符串，转换后的格式为：yyyy-MM-dd HH:mm:ss，如果日期为null则返回“”     *      * @param date     * @return     */    public static String convertToYYYYMMDDHHMMSS(Date date) {        if (date == null) {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDDHHMMSS);        return sdf.format(date);    }    /**     * 将日期转换成字符串，转换后的格式为：yyyyMMddHHmmss，如果日期为null则返回“”     *      * @param date     * @return     */    public static String convertToYYYYMMDDHHMMSSContinus(Date date) {        if (date == null) {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDDHHMMSS_CONTINUS);        return sdf.format(date);    }    /**     * 将日期转换成字符串，转换后的格式为：yyyy-MM-dd，如果日期为null则返回“”     *      * @param date     * @return     */    public static String convertToYYYYMMDD(Date date) {        if (date == null) {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDD);        return sdf.format(date);    }    /**     * 将日期转换成字符串，转换后的格式为：yyMM，如果日期为null则返回“”     *      * @param date     * @return     */    public static String convertToYYMM(Date date) {        if (date == null) {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat(YYMM);        return sdf.format(date);    }    /**     * 将当前日期转换成字符串，转换后的格式为：yyyy-MM-dd，如果日期为null则返回“”     *      * @return     */    public static String getCurrentDateYYYYMMDD() {        return convertToYYYYMMDD(new Date());    }    /**     * 将当前日期转换成字符串，转换后的格式为：yyyy-MM-dd HH:mm:ss，如果日期为null则返回“”     *      * @return     */    public static String getCurrentDateYYYYMMDDHHMMSS() {        return convertToYYYYMMDDHHMMSS(new Date());    }    /**     * 将当前日期转换成字符串，转换后的格式为：yyyyMMddHHmmss，如果日期为null则返回“”     *      * @return     */    public static String getCurrentDateYYYYMMDDHHMMSSContinus() {        return convertToYYYYMMDDHHMMSSContinus(new Date());    }    /**     * 将当前日期转换成字符串，转换后的格式为：yyMM，如果日期为null则返回“”     *      * @return     */    public static String getCurrentDateYYMM() {        return convertToYYMM(new Date());    }    // public static void main(String[] args){    // String currentDateYYMM = getCurrentDateYYMM();    // System.out.println(currentDateYYMM);    // }    /**     * 将日期转换成字符串，转换后的格式为：HH:mm，如果日期为null则返回“” HH:mm format eg. 10:20     *      * @param date     * @return     */    public static String convertToHHmm(Date date) {        if (date == null) {            return "";        }        SimpleDateFormat sdf = new SimpleDateFormat(HHmm);        return sdf.format(date);    }    /**     * 将字符串（格式：yyyy-MM-dd HH:mm:ss）转化为日期，如果格式不对，则返回null     *      * @param original     * @return     * @throws ParseException     */    public static Date convertToDateyyyyMMddHHmmss(String original) throws ParseException {        Date result = null;        try {            SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDDHHMMSS);            result = sdf.parse(original);        } catch (ParseException e) {            return null;        }        return result;    }    /**     * 将字符串（格式：yyyy-MM-dd HH:mm）转化为日期，如果格式不对，则返回null     *      * @param original     * @return     * @throws ParseException     */    public static Date convertToDateyyyyMMddHHmm(String original) throws ParseException {        Date result = null;        try {            SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDDHHMM);            result = sdf.parse(original);        } catch (ParseException e) {            return null;        }        return result;    }    /**     * 将字符串（格式：yyyy-MM-dd）转化为日期，如果格式不对，则返回null     *      * @param original     * @return     * @throws ParseException     */    public static Date convertToDateyyyyMMdd(String original) throws ParseException {        Date result = null;        try {            SimpleDateFormat sdf = new SimpleDateFormat(YYYYMMDD);            result = sdf.parse(original);        } catch (ParseException e) {            return null;        }        return result;    }    /**     * 将字符串（格式：yyyy-MM）转化为日期，如果格式不对，则返回null     *      * @param original     * @return     * @throws ParseException     */    public static Date convertToDateyyyyMM(String original) throws ParseException {        Date result = null;        try {            SimpleDateFormat sdf = new SimpleDateFormat(YYYYMM);            result = sdf.parse(original);        } catch (ParseException e) {            return null;        }        return result;    }    /**     * 将字符串（格式：yyyy）转化为日期，如果格式不对，则返回null     *      * @param original     * @return     * @throws ParseException     */    public static Date convertToDateyyyy(String original) throws ParseException {        Date result = null;        try {            SimpleDateFormat sdf = new SimpleDateFormat(YYYY);            result = sdf.parse(original);        } catch (ParseException e) {            return null;        }        return result;    }    /**     *      * 得到本月的第一天     */    public static Date getCurrentMonthFirstDay() {        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.DAY_OF_MONTH, calendar        .getActualMinimum(Calendar.DAY_OF_MONTH));        // calendar.set( Calendar.DATE, 1);        return calendar.getTime();    }    /**     *      * 得到本月的最后一天     */    public static Date getCurrentMonthLastDay() {        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.DAY_OF_MONTH, calendar        .getActualMaximum(Calendar.DAY_OF_MONTH));        return calendar.getTime();    }    /**     *      * 得到指定月的最后一天     */    public static Date getMonthLastDay(Long ms) {        Calendar calendar = Calendar.getInstance();        calendar.setTimeInMillis(ms);        // calendar.set(Calendar.DAY_OF_MONTH, 1);        calendar.add(Calendar.MONTH, 1);        calendar.add(Calendar.DAY_OF_MONTH, -1);        return calendar.getTime();    }    /**     *      * 得到指定月的第一天     */    public static Date getMonthFirstDay(Long ms) {        Calendar calendar = Calendar.getInstance();        calendar.setTimeInMillis(ms);        calendar.set(Calendar.DAY_OF_MONTH, 1);        // calendar.add(Calendar.MONTH, 1);        // calendar.add(Calendar.DAY_OF_MONTH, -1);        return calendar.getTime();    }    /**     * 获得明天日期     *      * @param currentday     * @return     */    public static Date getNextDay(Date currentday) {        // 明天日期        Date nextday = new Date();        long nexttime = (currentday.getTime() / 1000) + 60 * 60 * 24;        nextday.setTime(nexttime * 1000);        return nextday;    }    /***     * 时间戳转换为Date     *      * @param date     * @return     */    public static Date getLongDate(Long date) {        Date dd = new Date(date);        return dd;    }    public static void main(String[] args) throws ParseException {        System.out.print(getMonthLastDay(new Date().getTime()));    }}
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