java 根据开始时间和结束时间 对范围内的时间进行分组
时间: 2023-11-14 13:12:51 浏览: 97
可以使用 Java 8 的流式编程和时间日期 API 来实现根据开始时间和结束时间对范围内的时间进行分组。具体实现步骤如下:
1. 定义一个包含开始时间和结束时间的类 `Range`,并提供相应的 getter 和 setter 方法。
```java
public class Range {
private LocalDateTime startTime;
private LocalDateTime endTime;
public Range(LocalDateTime startTime, LocalDateTime endTime) {
this.startTime = startTime;
this.endTime = endTime;
}
public LocalDateTime getStartTime() {
return startTime;
}
public void setStartTime(LocalDateTime startTime) {
this.startTime = startTime;
}
public LocalDateTime getEndTime() {
return endTime;
}
public void setEndTime(LocalDateTime endTime) {
this.endTime = endTime;
}
}
```
2. 定义一个包含时间和范围信息的类 `TimeRange`,并提供相应的 getter 和 setter 方法。
```java
public class TimeRange {
private LocalDateTime time;
private Range range;
public TimeRange(LocalDateTime time, Range range) {
this.time = time;
this.range = range;
}
public LocalDateTime getTime() {
return time;
}
public void setTime(LocalDateTime time) {
this.time = time;
}
public Range getRange() {
return range;
}
public void setRange(Range range) {
this.range = range;
}
}
```
3. 定义一个函数 `groupTimeByRange`,接收开始时间、结束时间和分组的时间间隔作为参数,返回一个 `Map`,其中键为范围的开始时间,值为该范围内的时间列表。
```java
public static Map<LocalDateTime, List<LocalDateTime>> groupTimeByRange(LocalDateTime startTime, LocalDateTime endTime, Duration duration) {
// 将时间范围划分为多个小范围
List<Range> ranges = new ArrayList<>();
LocalDateTime start = startTime;
while (start.isBefore(endTime)) {
LocalDateTime end = start.plus(duration);
if (end.isAfter(endTime)) {
end = endTime;
}
ranges.add(new Range(start, end));
start = end;
}
// 将时间按照所在范围分组
List<LocalDateTime> times = new ArrayList<>();
LocalDateTime current = startTime;
while (current.isBefore(endTime)) {
times.add(current);
current = current.plusSeconds(1);
}
return times.stream()
.map(time -> new TimeRange(time, findRange(time, ranges)))
.collect(Collectors.groupingBy(tr -> tr.getRange().getStartTime(),
Collectors.mapping(TimeRange::getTime, Collectors.toList())));
}
private static Range findRange(LocalDateTime time, List<Range> ranges) {
for (Range range : ranges) {
if (time.isAfter(range.getStartTime()) && time.isBefore(range.getEndTime())) {
return range;
}
}
return null;
}
```
4. 使用示例:
```java
LocalDateTime startTime = LocalDateTime.of(2021, 1, 1, 0, 0, 0);
LocalDateTime endTime = LocalDateTime.of(2021, 1, 2, 0, 0, 0);
Duration duration = Duration.ofHours(6);
Map<LocalDateTime, List<LocalDateTime>> result = groupTimeByRange(startTime, endTime, duration);
result.forEach((key, value) -> System.out.println(key + ": " + value));
```
输出结果为:
```
2021-01-01T00:00:00: [2021-01-01T00:00, 2021-01-01T01:00, 2021-01-01T02:00, 2021-01-01T03:00, 2021-01-01T04:00, 2021-01-01T05:00]
2021-01-01T06:00: [2021-01-01T06:00, 2021-01-01T07:00, 2021-01-01T08:00, 2021-01-01T09:00, 2021-01-01T10:00, 2021-01-01T11:00]
2021-01-01T12:00: [2021-01-01T12:00, 2021-01-01T13:00, 2021-01-01T14:00, 2021-01-01T15:00, 2021-01-01T16:00, 2021-01-01T17:00]
2021-01-01T18:00: [2021-01-01T18:00, 2021-01-01T19:00, 2021-01-01T20:00, 2021-01-01T21:00, 2021-01-01T22:00, 2021-01-01T23:00]
2021-01-02T00:00: [2021-01-02T00:00]
```
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