使用"hh:mm“Java操作

Question

我有一个时间和分钟范围的表，"07:00“到"14:00”，还有一个获取这些值的Java Api。一开始我用的是秒(28800到50400)。

我想得到每5分钟的所有数值("07:05“、"07:10”、"07:15“、”07:20“)."08:15"..。"13:55“、"14:00")。

但我不太明白该如何干净地做这件事。

类方法(在控制台上工作得很好，但api的输出以纳米秒为单位)：

@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实现的实际输出：

   [{"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

不需要在这里转你自己的数据类型。

java.time.LocalTime

Java8及更高版本有适合这种情况的数据类型：java.time.LocalTime，一个没有日期和没有时区的时间。将此用于您的业务逻辑。从这些对象，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，用于在数据库中或从数据库中传递这些值：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、12:20，12:25，12:30，12:35，12:40，12:45，12:50，12:55，13:05，13:10，13:15，13:20，13:25，13:30，13:35，13:40，13:45，13:50，13:55，14:00 initialCapacity: 85 times.size 85

要输入数据库，请转换为java.sql.Time。

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

时区

重要:请注意，您的原始代码和这个java.time代码示例都只使用假想的一天时间，假设一个虚构的24小时通用日。日照节约时间(DST)等反常现象意味着白天并不总是24小时长。您列出的某些时间在特定时区的特定日期上可能不存在。

如果您关心的是特定日期的真实时刻、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，使用%和/。有点像

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);
}

然后您可以检索分钟数

 storage.get("10:45");