日期工具类

import cn.hutool.json.JSONUtil;

import java.time.LocalDate;
import java.time.Year;
import java.time.YearMonth;
import java.time.format.DateTimeFormatter;

public class DateUtil {

    /**
     * 获取最近 n 日日期数据
     * @param n
     * @param containCurDay
     * @return
     */
    public static String[] getLastDays(int n, boolean containCurDay) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        LocalDate currentDate = LocalDate.now();// 获取当前日期
        String[] dates = new String[n];
        int temp = n;
        if(containCurDay){
            temp = (n - 1);
        }
        for (int i = 0; i < n; i++) {
            LocalDate localDate = LocalDate.from(currentDate).minusDays(temp-i);
            dates[i] = localDate.format(formatter);
        }
        return dates;
    }

    /**
     * 获取最近 n 月日期数据
     * @param n
     * @param containCurMonth  是否包含当前月
     * @return   ["2024-07","2024-08","2024-09"]
     */
    public static String[] getLastMonths(int n, boolean containCurMonth) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM");
        LocalDate currentDate = LocalDate.now();// 获取当前日期
        String[] months = new String[n];
        int temp = n;
        if(containCurMonth){
            temp = (n - 1);
        }
        for (int i = 0; i < n; i++) {
            YearMonth yearMonth = YearMonth.from(currentDate).minusMonths(temp-i);
            months[i] = yearMonth.format(formatter);
        }
        return months;
    }

    /**
     * 获取最近 n 年日期数据
     * @param n
     * @param containCurYear
     * @return  ["2022","2023","2024"]
     */
    public static String[] getLastYears(int n, boolean containCurYear) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy");
        LocalDate currentDate = LocalDate.now();// 获取当前日期
        String[] years = new String[n];
        int temp = n;
        if(containCurYear){
            temp = (n - 1);
        }
        for (int i = 0; i < n; i++) {
            Year year = Year.from(currentDate).minusYears(temp-i);
            years[i] = year.format(formatter);
        }
        return years;
    }

    public static void main(String[] args) {

        // 获取最近30天日期数据
        String[] last30Days = DateUtil.getLastDays(30, true);
        System.out.println(JSONUtil.toJsonStr(last30Days));

        // 获取最近12个月数据
        String[] last12Months = DateUtil.getLastMonths(2, true);
        System.out.println(JSONUtil.toJsonStr(last12Months));

        // 获取最近3年日期数据
        String[] last3Years = DateUtil.getLastYears(3, true);
        System.out.println(JSONUtil.toJsonStr(last3Years));

    }

}