根据日期字符串判断当月第几周

朴灿烈づ我的快乐病毒、 2023-02-14 15:36 20阅读 0赞

package com.emg.matchs.utils;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    /**
     * @Auther: sss
     * @Date: 2020/6/3 14:41
     * @Description:
     * 注意问题:
     * 在Calendar中每周是从我们中国人的周日(星期七)开始计算的.
     * 所以Calendar的周一实际为我们中国人的上周的星期七.
     * 在此需要特殊处理一下.
     */
    public class Test {
        /**
         * 根据日期字符串判断当月第几周
         *
         * @param str
         * @return
         * @throws Exception
         */
        public static int getWeek(String str) throws Exception {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date date = sdf.parse(str);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
            //第几周
            int week = calendar.get(Calendar.WEEK_OF_MONTH);
            //第几天，从周日开始
            int day = calendar.get(Calendar.DAY_OF_WEEK);
            if (day == 1) {
                day = 7;
                week = week - 1;
            } else {
                day = day - 1;
            }
            return week;
        }
    }

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