LocalDate的用法

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日期时间转换

• 2023-03-30 14:25:00.000

@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss:sss")

private LocalDateTime requestTimeStamp;

• 2021-06-18T10:46:19.673785+08:00

new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss:sssXXX");

yyyy-MM-dd HH:mm:ss.SSS Z

• 24-May-2023
  dd-MMM-yyyy

比较大小

• isAfter()

• isBefore()

• isEqual()

• LocalDate.now();

• localDate1.plusDays(5);

• localDate2.minusDays(1);

用Stream分组

        Map<String, List<Response>> map =list.stream().collect( Collectors.groupingBy(Response::getId, Collectors.toList()));
用Stream分组后只取日期最新
 ArrayList<Response> groupedList =  new ArrayList<>(list.stream()
                .collect(Collectors.toMap(Response::getId, Function.identity(),
                        (c1, c2) -> c1.getDetails().getCreateDate().isAfter(c2.getDetails().getCreateDate()) ? c1 : c2))
                .values());

用Stream先分组后排序
按日期分组后，按日期倒序排序

  Map<LocalDate, List<Response>> result = new LinkedHashMap<>();
        map.entrySet().stream().sorted(Collections.reverseOrder(Map.Entry.comparingByKey())).forEachOrdered(x -> result.put(x.getKey(), x.getValue()));

按同一订单号分组后，按日期排序 
stream筛选
过期的放进list

List<Response> overdueList = list.stream().filter(response-> response.getDetails().getDueDate().isBefore(LocalDate.now())).collect(Collectors.toList());

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