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1. ??????

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• ?????dateToString
• ???
  • date?????
  • type????????????yyyy-MM-dd???yyyy-MM-dd HH:mm:ss?
• ??????????????

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public static String dateToString(Object date, String type) {    if (date != null) {        try {            SimpleDateFormat sdf = new SimpleDateFormat(type);            return sdf.format(date);        } catch (Exception e) {            e.printStackTrace();        }    }    return "";}

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• ?????date?String?????????Date????????IllegalArgumentException???
• ??SimpleDateFormat???????????????????

2. ??????

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• ?????StringToDate
• ???
  • dateStr??????
  • type????????????yyyy-MM-dd???yyyy-MM-dd HH:mm:ss?
• ????Date??

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public static Date StringToDate(String date, String type) {    try {        SimpleDateFormat sdf = new SimpleDateFormat(type);        return sdf.parse(date);    } catch (Exception e) {        e.printStackTrace();    }    return null;}

3. ?????

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• ??StringToDate?dateToString???????????????

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public static void main(String[] args) {    String type = "yyyy-MM-dd HH:mm:ss"; // ????    long date = 1559014035000L; // ???    Date riqi = StringToDate(date, type);    System.out.println(riqi);    String shiJian = dateToString(riqi, type);    System.out.println(shiJian);}

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