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背景

因邮件数据过多，因此采用了分表的方式来进行存储, 支持按照天、周、月来分表以下为设计的方法

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;
import java.util.ArrayList;
import java.util.List;public class IndexSuffixCalculator {// 按天格式化日期的模式private static final DateTimeFormatter DAY_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");// 按周格式化日期的模式private static final DateTimeFormatter WEEK_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");// 按月格式化日期的模式private static final DateTimeFormatter MONTH_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM");/*** 根据时间范围和配置计算索引后缀** @param startDate 开始日期* @param endDate   结束日期* @param mode      配置模式：day, week 或 month* @return 索引后缀列表*/public List<String> calculateIndexSuffixes(LocalDate startDate, LocalDate endDate, String mode) {if ("day".equalsIgnoreCase(mode)) {return calculateDailySuffixes(startDate, endDate);} else if ("week".equalsIgnoreCase(mode)) {return calculateWeeklySuffixes(startDate, endDate);} else if ("month".equalsIgnoreCase(mode)) {return calculateMonthlySuffixes(startDate, endDate);} else {throw new IllegalArgumentException("Unsupported mode: " + mode);}}/*** 按天计算索引后缀** @param startDate 开始日期* @param endDate   结束日期* @return 按天的索引后缀列表*/private List<String> calculateDailySuffixes(LocalDate startDate, LocalDate endDate) {List<String> suffixes = new ArrayList<>();LocalDate currentDate = startDate;while (!currentDate.isAfter(endDate)) {suffixes.add(currentDate.format(DAY_FORMATTER));currentDate = currentDate.plusDays(1); // 移动到下一天}return suffixes;}/*** 按周计算索引后缀** @param startDate 开始日期* @param endDate   结束日期* @return 按周的索引后缀列表*/private List<String> calculateWeeklySuffixes(LocalDate startDate, LocalDate endDate) {List<String> suffixes = new ArrayList<>();LocalDate currentDate = startDate.with(TemporalAdjusters.previousOrSame(java.time.DayOfWeek.MONDAY));while (!currentDate.isAfter(endDate)) {suffixes.add(currentDate.format(WEEK_FORMATTER));currentDate = currentDate.plusWeeks(1); // 移动到下一周的周一}return suffixes;}/*** 按月计算索引后缀** @param startDate 开始日期* @param endDate   结束日期* @return 按月的索引后缀列表*/private List<String> calculateMonthlySuffixes(LocalDate startDate, LocalDate endDate) {List<String> suffixes = new ArrayList<>();LocalDate currentDate = startDate.with(TemporalAdjusters.firstDayOfMonth());while (!currentDate.isAfter(endDate)) {suffixes.add(currentDate.format(MONTH_FORMATTER));currentDate = currentDate.plusMonths(1); // 移动到下一个月的第一天}return suffixes;}public static void main(String[] args) {// 测试用例LocalDate startDate = LocalDate.of(2025, 4, 1);LocalDate endDate = LocalDate.of(2025, 6, 30);IndexSuffixCalculator calculator = new IndexSuffixCalculator();// 按天计算List<String> dailySuffixes = calculator.calculateIndexSuffixes(startDate, endDate, "day");System.out.println("Daily Suffixes: " + dailySuffixes);// 按周计算List<String> weeklySuffixes = calculator.calculateIndexSuffixes(startDate, endDate, "week");System.out.println("Weekly Suffixes: " + weeklySuffixes);// 按月计算List<String> monthlySuffixes = calculator.calculateIndexSuffixes(startDate, endDate, "month");System.out.println("Monthly Suffixes: " + monthlySuffixes);}
}