common_helper/src/main/java/com/xiongyingqi/util/DateHelper.java
public static String getSeqWeek() {
        Calendar c = Calendar.getInstance(Locale.CHINA);
        String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
        if (week.length() == 1)
            week = "0" + week;
        String year = Integer.toString(c.get(Calendar.YEAR));
        return year + week;
    }
public static String getSeqWeek() {
        Calendar c = Calendar.getInstance(Locale.CHINA);
        String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
        if (week.length() == 1)
            week = "0" + week;
        String year = Integer.toString(c.get(Calendar.YEAR));
        return year + week;
    }
产生周序列,即得到当前时间所在的年度是第几周

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