How to use

DateUtil

in

cn.jiangzeyin

/**
 * 获取当前指定格式时间
 *
 * @param pattern 格式
 * @return 结果
 */
public static String getCurrentFormatTime(String pattern) {
  return formatTime(pattern, getCurrentTimeMillis());
}

/**
 * 字符串时间转date
 *
 * @param time    字符串时间
 * @param pattern 时间格式
 * @return date
 * @throws ParseException 装换异常
 */
public static Date parseTime(String time, String pattern) throws ParseException {
  SimpleDateFormat sdf = getDateFormat(pattern);
  return sdf.parse(time);
}

public static Date formatTimeStamp(int date) {
  return formatTime(date * 1000L);
}

/**
 * @return 当前10位时间戳
 */
public static int getCurrentShortTimeMillis() {
  return (int) (getCurrentTimeMillis() / 1000L);
}

/**
 * 获取当前日期相关int
 *
 * @param pattern 需要的格式
 * @return int
 */
public static int getCurrentFormatTimeInt(String pattern) {
  return StringUtil.parseInt(getCurrentFormatTime(pattern), -1);
}

  @Override
  public JSONObject parseInfo(String id) {
    id = Long.toBinaryString(Long.parseLong(id));
    int len = id.length();
    JSONObject jsonObject = new JSONObject();
    int sequenceStart = len < workerIdShift ? 0 : len - workerIdShift;
    int workerStart = len < dataCenterIdShift ? 0 : len - dataCenterIdShift;
    int timeStart = len < timestampLeftShift ? 0 : len - timestampLeftShift;
    String sequence = id.substring(sequenceStart, len);
    String workerId = sequenceStart == 0 ? "0" : id.substring(workerStart, sequenceStart);
    String dataCenterId = workerStart == 0 ? "0" : id.substring(timeStart, workerStart);
    String time = timeStart == 0 ? "0" : id.substring(0, timeStart);
    int sequenceInt = Integer.valueOf(sequence, 2);
    jsonObject.put("sequence", sequenceInt);
    int workerIdInt = Integer.valueOf(workerId, 2);
    jsonObject.put("workerId", workerIdInt);
    int dataCenterIdInt = Integer.valueOf(dataCenterId, 2);
    jsonObject.put("dataCenter", dataCenterIdInt);
    long diffTime = Long.parseLong(time, 2);
    long timeLong = diffTime + startTime;
    String date = DateUtil.formatTime(null, timeLong);
    jsonObject.put("date", date);
    return jsonObject;
  }
}

@Override
public synchronized String nextId() {
  //获取当前毫秒数
  long timestamp = timeGen();
  //如果服务器时间有问题(时钟后退) 报错。
  if (timestamp < lastTimestamp) {
    throw new RuntimeException(String.format(
        "Clock moved backwards.  Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
  }
  //如果上次生成时间和当前时间相同,在同一毫秒内
  if (lastTimestamp == timestamp) {
    //sequence自增，因为sequence只有12bit，所以和sequenceMask相与一下，去掉高位
    sequence = (sequence + 1) & sequenceMask;
    //判断是否溢出,也就是每毫秒内超过4095，当为4096时，与sequenceMask相与，sequence就等于0
    if (sequence == 0) {
      //自旋等待到下一毫秒
      timestamp = tilNextMillis(lastTimestamp);
    }
  } else {
    //如果和上次生成时间不同,重置sequence，就是下一毫秒开始，sequence计数重新从0开始累加
    sequence = 0L;
  }
  lastTimestamp = timestamp;
  long suffix = (dataCenterId << dataCenterIdShift) | (workerId << workerIdShift) | sequence;
  String datePrefix = DateUtil.formatTime("yyyyMMddHHmmssSSS", timestamp);
  return datePrefix + suffix;
}

  /**
   * 根据日期 找到对应日期的 星期
   */
  public static String getDayOfWeekByDate(String date) throws ParseException {
    SimpleDateFormat myFormatter = getDateFormat("yyyy-MM-dd");// new SimpleDateFormat("yyyy-MM-dd");
    Date myDate = myFormatter.parse(date);
    SimpleDateFormat formatter = getDateFormat("E");// new SimpleDateFormat("E");
    return formatter.format(myDate);
  }
}

/**
 * 格式化13位时间戳
 *
 * @param pattern    格式
 * @param timeMillis 13位时间戳
 * @return 结果
 * @author jiangzeyin
 */
public static String formatTime(String pattern, long timeMillis) {
  if (pattern == null || pattern.length() == 0)
    pattern = "yyyy-MM-dd HH:mm:ss";
  SimpleDateFormat sdf = getDateFormat(pattern);
  return sdf.format(timeMillis);
}

/**
 * 格式化10位时间戳
 *
 * @param pattern    格式
 * @param timeMillis 10位时间戳
 * @return 结果
 * @author jiangzeyin
 */
public static String formatTimeStamp(String pattern, int timeMillis) {
  if (pattern == null || pattern.length() == 0)
    pattern = "yyyy-MM-dd HH:mm:ss";
  Calendar nowDate = new GregorianCalendar();
  nowDate.setTimeInMillis(timeMillis * 1000L);
  SimpleDateFormat df = getDateFormat(pattern);
  return df.format(nowDate.getTime());
}