Java线程安全的日期格式化工具类

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/** * 日期格式化辅助类 *  * @author hkb <br> */public final class DateUtil {    /** 线程安全的日期格式对象 */    private static final ThreadLocal<DateFormat> DATE_FORMAT = new ThreadLocal<DateFormat>() {        @Override        protected DateFormat initialValue() {            // 完整日期            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        }    };    /** 线程安全的日期格式对象 */    private static final ThreadLocal<DateFormat> YMD = new ThreadLocal<DateFormat>() {        @Override        protected DateFormat initialValue() {            // 年月日            return new SimpleDateFormat("yyyy-MM-dd");        }    };    /**     * 格式化完整日期     *      * @param date     * @return yyyy-MM-dd HH:mm:ss格式的字符串     */    public static final String formatDate(Date date) {        return DATE_FORMAT.get().format(date);    }    /**     * 格式化年月日     *      * @param date     * @return yyyy-MM-dd格式的字符串     */    public static final String formatYMD(Date date) {        return YMD.get().format(date);    }    /**     * 获取指定日期0点的字符串     *      * @param date     * @return 返回示例:2017-12-23 00:00:00     */    public static final String getZeroPointStr(Date date) {        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.set(Calendar.HOUR_OF_DAY, 0);        calendar.set(Calendar.MINUTE, 0);        calendar.set(Calendar.SECOND, 0);        calendar.set(Calendar.MILLISECOND, 0);        return formatDate(calendar.getTime());    }    /**     * 获取指定日期末点的字符串     *      * @param date     * @return 返回示例:2017-12-23 23:59:59     */    public static final String getLastPointStr(Date date) {        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.set(Calendar.HOUR_OF_DAY, 23);        calendar.set(Calendar.MINUTE, 59);        calendar.set(Calendar.SECOND, 59);        calendar.set(Calendar.MILLISECOND, 999);        return formatDate(calendar.getTime());    }    /**     * 获取指定日期的0点的毫秒数     *      * @param date     * @return     */    public static final long getZeroPointMillisecond(Date date) {        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.set(Calendar.HOUR_OF_DAY, 0);        calendar.set(Calendar.MINUTE, 0);        calendar.set(Calendar.SECOND, 0);        calendar.set(Calendar.MILLISECOND, 0);        return calendar.getTime().getTime();    }    /**     * 获取指定日期的末点的毫秒数     *      * @param date     * @return     */    public static final long getLastPointMillisecond(Date date) {        Calendar calendar = Calendar.getInstance();        calendar.setTime(date);        calendar.set(Calendar.HOUR_OF_DAY, 23);        calendar.set(Calendar.MINUTE, 59);        calendar.set(Calendar.SECOND, 59);        calendar.set(Calendar.MILLISECOND, 999);        return calendar.getTime().getTime();    }    /**     * 测试     *      * @param args     */    public static void main(String[] args) {        Date now = new Date();        System.out.println(formatDate(now));        System.out.println(formatYMD(now));        System.out.println(getZeroPointStr(now));        System.out.println(getLastPointStr(now));        System.out.println(getZeroPointMillisecond(now));        System.out.println(getLastPointMillisecond(now));    }}
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