使用“hh:mm”Java 操作

Question

我有一个表，其范围为小时和分钟，从“07:00”到“14:00”，以及一个获取这些值的 Java Api。 起初我使用秒数（28800 到 50400）。

我想每 5 分钟获取一次介于两者之间的所有值（“07:05”、“07:10”、“07:15”、“07:20”...“08:15”.. . "13:55", "14:00").

但我不知道如何以干净的方式做到这一点。

类方法（在控制台上效果很好，但 api 的输出以纳秒为单位：

@Transient
public List<LocalTime> getHorarios(){

    long initialCapacity = 0;
    List<LocalTime> times = new ArrayList<LocalTime> ( ( int ) initialCapacity );
    while (  ! nextTime.isAfter ( stop ) ) {
        times.add ( nextTime );
        nextTime = nextTime.plusMinutes ( 5 );
    }
    return times;
}

@Transient
public List<LocalTime> getHorariosLibres(List<LocalTime> horariosTomados){

    List<LocalTime> horariosLibres = getHorarios();
    horariosLibres.removeAll(horariosTomados);
    return horariosLibres;
}

到目前为止，这是我的控制器：

@RequestMapping(value = "/horario/{fecha}", method = RequestMethod.GET)
@ResponseBody
public Object queryHorariosLibres(@PathVariable("fecha") @DateTimeFormat(pattern="yyyy-MM-dd") Date fecha) {
    List<LocalTime> horariosTomados = turnoService.getHorariosTomados(fecha);
    Calendar dia = new GregorianCalendar();
    dia.setTime(fecha);
    Horario horario = horarioRepository.findByDia(dia.get(Calendar.DAY_OF_WEEK));  
    List<LocalTime> horariosLibres = horario.getHorariosLibres(horariosTomados);

    return horariosLibres;
}   

通过 API 实际输出：

   [{"hour":7,"minute":0,"second":0,"nano":0},{"hour":7,"minute":5,"second":0,"nano":0},{"hour":7,"minute":10,"second":0,"nano":0},{"hour":7,"minute":15,"second":0,"nano":0},{"hour":7,"minute":20,"second":0,"nano":0},{"hour":7,"minute":25,"second":0,"nano":0},{"hour":7,"minute":30,"second":0,"nano":0},{"hour":7,"minute":35,"second":0,"nano":0},{"hour":7,"minute":40,"second":0,"nano":0},{"hour":7,"minute":45,"second":0,"nano":0},{"hour":7,"minute":50,"second":0,"nano":0},{"hour":7,"minute":55,"second":0,"nano":0},{"hour":8,"minute":0,"second":0,"nano":0},{"hour":8,"minute":5,"second":0,"nano":0},{"hour":8,"minute":10,"second":0,"nano":0},{"hour":8,"minute":15,"second":0,"nano":0},{"hour":8,"minute":20,"second":0,"nano":0},{"hour":8,"minute":25,"second":0,"nano":0},{"hour":8,"minute":30,"second":0,"nano":0},{"hour":8,"minute":35,"second":0,"nano":0},{"hour":8,"minute":40,"second":0,"nano":0},{"hour":8,"minute":45,"second":0,"nano":0},{"hour":8,"minute":50,"second":0,"nano":0},{"hour":8,"minute":55,"second":0,"nano":0},{"hour":9,"minute":0,"second":0,"nano":0},{"hour":9,"minute":5,"second":0,"nano":0},{"hour":9,"minute":10,"second":0,"nano":0},{"hour":9,"minute":15,"second":0,"nano":0},{"hour":9,"minute":20,"second":0,"nano":0},{"hour":9,"minute":25,"second":0,"nano":0},{"hour":9,"minute":30,"second":0,"nano":0},{"hour":9,"minute":35,"second":0,"nano":0},{"hour":9,"minute":40,"second":0,"nano":0},{"hour":9,"minute":45,"second":0,"nano":0},{"hour":9,"minute":50,"second":0,"nano":0},{"hour":9,"minute":55,"second":0,"nano":0},{"hour":10,"minute":0,"second":0,"nano":0},{"hour":10,"minute":5,"second":0,"nano":0},{"hour":10,"minute":10,"second":0,"nano":0},{"hour":10,"minute":15,"second":0,"nano":0},{"hour":10,"minute":20,"second":0,"nano":0},{"hour":10,"minute":25,"second":0,"nano":0},{"hour":10,"minute":30,"second":0,"nano":0},{"hour":10,"minute":35,"second":0,"nano":0},{"hour":10,"minute":40,"second":0,"nano":0},{"hour":10,"minute":45,"second":0,"nano":0},{"hour":10,"minute":50,"second":0,"nano":0},{"hour":10,"minute":55,"second":0,"nano":0},{"hour":11,"minute":0,"second":0,"nano":0},{"hour":11,"minute":5,"second":0,"nano":0},{"hour":11,"minute":10,"second":0,"nano":0},{"hour":11,"minute":15,"second":0,"nano":0},{"hour":11,"minute":20,"second":0,"nano":0},{"hour":11,"minute":25,"second":0,"nano":0},{"hour":11,"minute":30,"second":0,"nano":0},{"hour":11,"minute":35,"second":0,"nano":0},{"hour":11,"minute":40,"second":0,"nano":0},{"hour":11,"minute":45,"second":0,"nano":0},{"hour":11,"minute":50,"second":0,"nano":0},{"hour":11,"minute":55,"second":0,"nano":0},{"hour":12,"minute":0,"second":0,"nano":0},{"hour":12,"minute":5,"second":0,"nano":0},{"hour":12,"minute":10,"second":0,"nano":0},{"hour":12,"minute":15,"second":0,"nano":0},{"hour":12,"minute":20,"second":0,"nano":0},{"hour":12,"minute":25,"second":0,"nano":0},{"hour":12,"minute":30,"second":0,"nano":0},{"hour":12,"minute":35,"second":0,"nano":0},{"hour":12,"minute":40,"second":0,"nano":0},{"hour":12,"minute":45,"second":0,"nano":0},{"hour":12,"minute":50,"second":0,"nano":0},{"hour":12,"minute":55,"second":0,"nano":0},{"hour":13,"minute":0,"second":0,"nano":0},{"hour":13,"minute":5,"second":0,"nano":0},{"hour":13,"minute":10,"second":0,"nano":0},{"hour":13,"minute":15,"second":0,"nano":0},{"hour":13,"minute":20,"second":0,"nano":0},{"hour":13,"minute":25,"second":0,"nano":0},{"hour":13,"minute":30,"second":0,"nano":0},{"hour":13,"minute":35,"second":0,"nano":0},{"hour":13,"minute":40,"second":0,"nano":0},{"hour":13,"minute":45,"second":0,"nano":0},{"hour":13,"minute":50,"second":0,"nano":0},{"hour":13,"minute":55,"second":0,"nano":0},{"hour":14,"minute":0,"second":0,"nano":0}]

Answer 1

这里不需要滚动你自己的数据类型。

java.time.LocalTime

Java 8 及更高版本具有适合这种情况的数据类型：java.time.LocalTime，即没有日期和时区的时间。将此用于您的业务逻辑。从这些对象中，您可以生成一个字符串表示以显示给用户。

java.sql.Time

JDBC 有一种数据类型用于将此类值传入和传出数据库：java.sql.Time。

String inputStart = "07:00";
String inputStop = "14:00";

LocalTime start = LocalTime.parse ( inputStart );
LocalTime stop = LocalTime.parse ( inputStop );
LocalTime nextTime = start;

Duration duration = Duration.ofMinutes ( 5 );

long initialCapacity = ( Duration.between ( start , stop ).toMinutes () / duration.toMinutes () ) + 1;  // Optional line of code.  Could be omitted.
List<LocalTime> times = new ArrayList ( ( int ) initialCapacity );
while (  ! nextTime.isAfter ( stop ) ) {
    times.add ( nextTime );
    nextTime = nextTime.plus ( duration );  //  Or call .plusMinutes( int ) and pass a number of minutes.
}

转储到控制台。

System.out.println ( "times: " + times + " initialCapacity: " + initialCapacity + " times.size " + times.size () );

时间：[07:00, 07:05, 07:10, 07:15, 07:20, 07:25, 07:30, 07:35, 07:40, 07:45, 07:50, 07:55, 08:00, 08:05, 08:10, 08:15, 08:20, 08:25, 08:30, 08:35, 08:40, 08:45, 08:50, 08: 55, 09:00, 09:05, 09:10, 09:15, 09:20, 09:25, 09:30, 09:35, 09:40, 09:45, 09:50, 09:55, 10:00, 10:05, 10:10, 10:15, 10:20, 10:25, 10:30, 10:35, 10:40, 10:45, 10:50, 10:55, 11: 00、11:05、11:10、11:15、11:20、11:25、11:30、11:35、11:40、11:45、11:50、11:55、12:00、 12:05, 12:10, 12:15, 12:20, 12:25, 12:30, 12:35, 12:40, 12:45, 12:50, 12:55, 13:00, 13: 05、13:10、13:15、13:20、13:25、13:30、13:35、13:40、13:45、13:50、13:55、14:00]初始容量：85次.size 85

对于数据库的输入，转换为java.sql.Time。

java.sql.Time sqlTime = java.sql.Time.valueOf( myLocalTime );

时区

重要提示：请注意，您的原始代码和此 java.time 代码示例都只使用了假设虚构的 24 小时通用日 的虚构时间>。夏令时 (DST) 等异常情况意味着日子并不总是 24 小时长。您列出的某些时间可能在特定时区的特定日期不存在。

如果您关心真实时刻、特定日期的有效时间，请使用java.time.ZonedDateTime（或.OffsetDateTime）。对于数据库传输，请使用java.sql.Timestamp。

Answer 2

我会以分钟为单位并使用 % 和 /。类似的东西

Map<String,Integer> storage = new HashMap<String,Integer>();
for (int i=420; i< 840; i+=5)
{
     int hours = (i / 60);
     int minutes = (i % 60);
     String hourMinuteString = String.format("%02d", hours) + ":" 
                                      + String.format("%02d", minutes);
     storage.put(hourMinuteString, i);
}

然后你可以通过

来检索分钟数

 storage.get("10:45");