import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.time.LocalDate;
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import java.time.YearMonth;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.ChronoUnit;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.stream.Collectors;
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import java.util.stream.IntStream;
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public class ChineseMD5Util {
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// public static List<Integer> getSelectedIndices(int[] arr) {
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// List<Integer> indices = new ArrayList<>();
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// int index = 0;
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// int step = 3;
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// while (index < arr.length) {
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// indices.add(index);
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// index += step;
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// step = (step == 3) ? 1 : 3;
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// }
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// return indices;
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// }
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//
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// public static Integer getNextSelectedValue(int[] arr, int inputIndex) {
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// List<Integer> selectedIndices = getSelectedIndices(arr);
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// int currentPos = selectedIndices.indexOf(inputIndex);
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// if (currentPos != -1 && currentPos + 1 < selectedIndices.size()) {
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// return arr[selectedIndices.get(currentPos + 1)];
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// }
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// return null; // 或按需处理
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// }
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//
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// public static void main(String[] args) {
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// int[] arr = {2, 5, 8, 10, 15, 20, 25, 30, 35, 40, 45, 50, 15, 40, 32, 48};
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// System.out.println("输入 0，输出: " + getNextSelectedValue(arr, 0)); // 10
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// System.out.println("输入 3，输出: " + getNextSelectedValue(arr, 3)); // 15
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// System.out.println("输入 4，输出: " + getNextSelectedValue(arr, 4)); // 30
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// System.out.println("输入 4，输出: " + getNextSelectedValue(arr, 5)); // 30
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//
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// }
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public static List<String> getFormattedDatesOfPreviousMonth(String pattern) {
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// DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
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// YearMonth previousMonth = YearMonth.now().minusMonths(1);
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//
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// return IntStream.rangeClosed(1, previousMonth.lengthOfMonth())
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// .mapToObj(day -> previousMonth.atDay(day).format(formatter))
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// .collect(Collectors.toList());
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LocalDate today = LocalDate.now().minusDays(1);
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LocalDate oneMonthAgo = today.minusMonths(1);
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
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return IntStream.iterate(0, i -> i + 1)
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.limit(ChronoUnit.DAYS.between(oneMonthAgo, today) + 1)
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.mapToObj(oneMonthAgo::plusDays)
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.map(date -> date.format(formatter))
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.collect(Collectors.toList());
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}
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public static void main(String[] args) {
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List<String> formattedDates = getFormattedDatesOfPreviousMonth("yyyy-MM-dd");
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formattedDates.forEach(System.out::println);
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}
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}
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