Java获取 当前日期 之后 或 之前 多少天 日期工具类

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;/* 获取 当前日期 之后 或 之前 7天 日期工具类 @author xiwh*/
public class DateUtil {/* 获取未来任意天内的日期数组 @param intervals intervals天内* @return 日期数组*/public static ArrayList<String> futureDate(int intervals) {ArrayList<String> futureDaysList = new ArrayList<>();for (int i = 0; i < intervals; i++) {futureDaysList.add(getFutureDate(i));}return futureDaysList;}/* 获取未来第几天的日期 @param past* @return*/public static String getFutureDate(int past) {Calendar calendar = Calendar.getInstance();calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + past);Date today = calendar.getTime();SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");String result = format.format(today);return result;}/* 获取过去任意天内的日期数组 @param intervals intervals天内* @return 日期数组*/public static ArrayList<String> pastDate(int intervals) {ArrayList<String> pastDaysList = new ArrayList<>();for (int i = 0; i < intervals; i++) {pastDaysList.add(getPastDate(i));}return pastDaysList;}/* 获取过去第几天的日期 @param past* @return*/public static String getPastDate(int past) {Calendar calendar = Calendar.getInstance();calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) - past);Date today = calendar.getTime();SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");String result = format.format(today);return result;}public static void main(String[] args) {//过去System.out.println(pastDate(7));//未来System.out.println(futureDate(7));}}

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