日期工具类，获取今天明天，最近七天，每月，每年第一天和最后一天的日期

我会带着你远行 2024-03-24 09:09 21阅读 0赞

/**
     * 日期工具类
     */
    public class DateUtils2 {
    
        /**
         * 获取今天
         *
         * @return String
         */
        public static String getToday() {
            return new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        }
    
        /**
         * 获取昨天
         *
         * @return String
         */
        public static String getYestoday() {
            Calendar cal = Calendar.getInstance();
            cal.add(Calendar.DATE, -1);
            Date time = cal.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(time);
        }
    
    
        /**
         * 获取本月开始日期
         *
         * @return String
         **/
        public static String getMonthStart() {
            Calendar cal = Calendar.getInstance();
            cal.add(Calendar.MONTH, 0);
            cal.set(Calendar.DAY_OF_MONTH, 1);
            Date time = cal.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(time) + " 00:00:00";
        }
        /** 
        * @Description: 得到七天的日期，包括今天
        * @return: java.util.List<java.lang.String>
        */
        public static List<String> getSevenDate() {
    
            List<String> dateList = new ArrayList<>();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    
            for (int i = 0; i < 7; i++) {
    
                Date date = DateUtils.addDays(new Date(), -i);
                String formatDate = sdf.format(date);
                dateList.add(formatDate);
            }
            return dateList;
        }
        /**
         * 获取本月最后一天
         *
         * @return String
         **/
        public static String getMonthEnd() {
            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
            Date time = cal.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(time) + " 23:59:59";
        }
    
        /**
         * 获取本周的第一天
         *
         * @return String
         **/
        public static String getWeekStart() {
            Calendar cal = Calendar.getInstance();
            cal.add(Calendar.WEEK_OF_MONTH, 0);
            cal.set(Calendar.DAY_OF_WEEK, 2);
            Date time = cal.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(time) + " 00:00:00";
        }
    
        /**
         * 获取本周的最后一天
         *
         * @return String
         **/
        public static String getWeekEnd() {
            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));
            cal.add(Calendar.DAY_OF_WEEK, 1);
            Date time = cal.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(time) + " 23:59:59";
        }
    
        /**
         * 获取本年的第一天
         *
         * @return String
         **/
        public static String getYearStart() {
            return new SimpleDateFormat("yyyy").format(new Date()) + "-01-01 00:00:00";
        }
    
        /**
         * 获取本年的最后一天
         *
         * @return String
         **/
        public static String getYearEnd() {
            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.MONTH, calendar.getActualMaximum(Calendar.MONTH));
            calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
            Date currYearLast = calendar.getTime();
            return new SimpleDateFormat("yyyy-MM-dd").format(currYearLast) + " 23:59:59";
        }
    
           /*获取前一个小时*/
        public static String getLastHour() {
            //getInstance()将返回一个Calendar的对象。
            Calendar calendar = Calendar.getInstance();
            //设置小时
            calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) - 1);
            //格式化时间
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH");
            //打印出时间
            System.out.println("一个小时前的时间：" + df.format(calendar.getTime()));
            System.out.println("当前的时间：" + df.format(new Date()));
            return df.format(calendar.getTime());
        }
    
    
    
    
        public static void main(String[] args) {
            System.out.println("获取今天:" + getToday());
            System.out.println("获取昨天:" + getYestoday());
            System.out.println("获取最近七天:" + getSevenDate);
            System.out.println("获取本月开始日期:" + getMonthStart());
            System.out.println("获取本月最后一天:" + getMonthEnd());
            System.out.println("获取本周的第一天:" + getWeekStart());
            System.out.println("获取本周的最后一天:" + getWeekEnd());
            System.out.println("获取本年的第一天:" + getYearStart());
            System.out.println("获取本年的最后一天:" + getYearEnd());
            System.out.println("获取前一个小时:" + getLastHour());
        }
    
    }

获取最近七天的方法需要加入一个依赖

<dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
            </dependency>