java 获取月、周几

青旅半醒 2023-02-25 15:26 10阅读 0赞

### java 获取月、周几 ###

*   *   *  获取月、日 （如：7.13）
         *  获取星期几（如：周三）
         *  日期字符串转时间（如：2020-05-20）
         *  获取日期前某天或后某天

### 获取月、日 （如：7.13） ###

/**
         * 获取当前时间月日 7.13
         * @param date
         * @return
         */
        public static String getMonthDay(Date date) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            //month从0开始
            int month = calendar.get(Calendar.MONTH) + 1;
            int day = calendar.get(Calendar.DAY_OF_MONTH);
            return month+"."+day;
        }

### 获取星期几（如：周三） ###

/**
         * 获取周几
         * @param date
         * @return
         */
        public static String getWeek(Date date) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            int weekday = calendar.get(Calendar.DAY_OF_WEEK);
            String week = null;
            if (weekday == 1) {
                week = "周日";
            } else if (weekday == 2) {
                week = "周一";
            } else if (weekday == 3) {
                week = "周二";
            } else if (weekday == 4) {
                week = "周三";
            } else if (weekday == 5) {
                week = "周四";
            } else if (weekday == 6) {
                week = "周五";
            } else if (weekday == 7) {
                week = "周六";
            }
            return week;
        }

### 日期字符串转时间（如：2020-05-20） ###

/**
         * 根据日期字符串获取时间
         * @param str
         * @return
         */
        public static Date getDate(String str) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date parse = null;
            try {
                parse = sdf.parse(str);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return parse;
        }

### 获取日期前某天或后某天 ###

/**
         * 获取当前时间前面某天或者后面某天，date为今天
         * @param amount为-1，表示昨天，amount为1表示明天
         * @param date
         * @return
         */
        public static Date getOtherDay(Date date, int amount) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            calendar.add(Calendar.DAY_OF_MONTH,amount);
            Date time = calendar.getTime();
            return time;
        }