java 时间类的用法

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直接看代码例子：
import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.TimeZone;/** * @author zhuerddong *  */public class DateFormatHelper {public static final String PATTERN_YMD = "yyyyMMdd";public static final String PATTERN_YMDHMS = "yyyyMMddHHmmss";public static final String PATTERN_Y_M_D_HMS = "yyyy-MM-dd HH:mm:ss";public static final String PATTERN_YMDHMSMS = "yyyyMMddHHmm";public static final String PATTERN_YMD_HMS = "yyyyMMdd HH:mm:ss";public static final long DAY_MILLTIMES = 24 * 3600 * 1000;public static final long LOCAL_TIMEZONE_OFFSET = TimeZone.getDefault().getRawOffset();private static final ThreadLocal<Map<String, DateFormat>> dateFormats = new ThreadLocal<Map<String, DateFormat>>() {@Overrideprotected Map<String, DateFormat> initialValue() {return new HashMap<String, DateFormat>();}};private static DateFormat getDateFormat(String pattern) {Map<String, DateFormat> map = dateFormats.get();DateFormat df = map.get(pattern);if (df == null) {df = new SimpleDateFormat(pattern);}map.put(pattern, df);return df;}public static String format(String pattern, long date) {DateFormat df = getDateFormat(pattern);return df.format(new Date(date));}public static String format(String pattern, Date date) {DateFormat df = getDateFormat(pattern);return df.format(date);}public static Date parse(String pattern, String date) throws ParseException {DateFormat df = getDateFormat(pattern);return df.parse(date);}public static long getDayBegin(long time, boolean localTimeZone) {time = time - (time % DAY_MILLTIMES);if (localTimeZone) {time -= LOCAL_TIMEZONE_OFFSET;}return time;}public static long getDayBegin(long time) {return getDayBegin(time, true);}public static long getDayEnd(long time, boolean localTimeZone) {return getDayBegin(time, localTimeZone) + DAY_MILLTIMES - 1;}public static long getDayEnd(long time) {return getDayEnd(time, true);}public static long getDayBegin(Date date) {Calendar c = Calendar.getInstance();c.setTime(date);c.set(Calendar.HOUR_OF_DAY, 0);c.set(Calendar.MINUTE, 0);c.set(Calendar.SECOND, 0);c.set(Calendar.MILLISECOND, 0);return c.getTimeInMillis();}public static long getDayEnd(Date date) {Calendar c = Calendar.getInstance();c.setTime(date);c.set(Calendar.HOUR_OF_DAY, 23);c.set(Calendar.MINUTE, 59);c.set(Calendar.SECOND, 59);c.set(Calendar.MILLISECOND, 999);return c.getTimeInMillis();}public static void main(String[] args) {System.out.print(DateFormatHelper.format(PATTERN_YMDHMSMS, new Date()));}}
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