java获取某个日期区间

根据当前日期，获取某个日期区间

/**
 * 根据当前日期获得最近n周的日期区间（包含本周）
 * @param n
 * @param sdf
 * @return
 */
public static String getNWeekTimeInterval(int n, SimpleDateFormat sdf,SimpleDateFormat sdf1) {
    String beginDate = getFromToDate(sdf, new Date(), n, 0, 0);
    String endDate = getFromToDate(sdf1, new Date(), n, 1, 0);
    return beginDate + "," + endDate;
}

/**
 * 根据当前日期获得最近n周的日期区间（不包含本周）
 * @param n
 * @param sdf
 * @return
 */
public static String getNWeekTimeIntervalTwo(int n, SimpleDateFormat sdf,SimpleDateFormat sdf1) {
    String beginDate = getFromToDate(sdf, new Date(), n, 0, 1);
    String endDate = getFromToDate(sdf1, new Date(), n, 1, 1);
    return beginDate + "," + endDate;
}

/**
 * 根据当前日期获得本周的日期区间（本周周一和周日日期）
 * @param sdf
 * @return
 */
public static String getThisWeekTimeInterval(SimpleDateFormat sdf,SimpleDateFormat sdf1) {
    return getNWeekTimeInterval(1, sdf,sdf1);
}

/**
 * 根据当前日期获得上周的日期区间（上周周一和周日日期）
 * @param sdf
 * @return
 */
public static String getLastWeekTimeInterval(SimpleDateFormat sdf,SimpleDateFormat sdf1) {
    return getNWeekTimeIntervalTwo(1, sdf,sdf1);
}
/**
 * 获取本月的第一天
 */
public static String getThisMonthStart(SimpleDateFormat sdf){
    Calendar calendar = Calendar.getInstance();//日历对象
    calendar.set(Calendar.DAY_OF_MONTH,1);
    String s = sdf.format(calendar.getTime());
    return s;
}
/**
 * 获取本月的最后一天
 */
public static String getThisMonthEnd(SimpleDateFormat sdf){
    Calendar calendar1 = Calendar.getInstance();//日历对象
    calendar1.set(Calendar.DAY_OF_MONTH,calendar1.getActualMaximum(Calendar.DAY_OF_MONTH));
    String s = sdf.format(calendar1.getTime());
    return s;
}
/**
 * 获取上月的第一天
 */
public static String getLastMonthStart(SimpleDateFormat sdf){
    Calendar calendar2 = Calendar.getInstance();
    calendar2.add(Calendar.MONTH, -1);
    calendar2.set(Calendar.DAY_OF_MONTH,1);
    String s = sdf.format(calendar2.getTime());
    return s;
}
/**
 * 获取上月的最后一天
 */
public static String getLastMonthEnd(SimpleDateFormat sdf){
    Calendar calendar3 = Calendar.getInstance();
    calendar3.set(Calendar.DAY_OF_MONTH, 0);
    String s = sdf.format(calendar3.getTime());
    return s;
}
/**
 * 获取当前日期前/后n天
 * @param i 前7天为-7，后1天为1
 * @param simpleDateFormat
 * @return
 */
public static String getDate1(int i,SimpleDateFormat simpleDateFormat) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(new Date());
    //i=-1获取的是前一天  1=1获取的是后一天  1=0获取的是当天
    calendar.add(Calendar.DATE,i);
    return simpleDateFormat.format(calendar.getTime());
}
/**
 * 获取某年第一天日期开始时刻
 * @param year 年份
 * @return Date
 */
public static String getYearFirstDay(int year,SimpleDateFormat simpleDateFormat){
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(Calendar.YEAR, year);
    return simpleDateFormat.format(cal.getTime());
}

/**
 * 获取某年最后一天日期最后时刻
 * @param year 年份
 * @return Date
 */
public static String getYearLastDay(int year,SimpleDateFormat simpleDateFormat){
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(Calendar.YEAR, year);
    cal.roll(Calendar.DAY_OF_YEAR, -1);
    return simpleDateFormat.format(cal.getTime());
}

测试：

    public static void main(String[] args) {
        //System.out.println(DateUtils.getDate()+"%");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();//日历对象
        calendar.set(Calendar.DAY_OF_WEEK,1);
        System.out.println(sdf.format(calendar.getTime()));
        Calendar calendar1 = Calendar.getInstance();//日历对象
        calendar1.set(Calendar.DAY_OF_WEEK,calendar1.getActualMaximum(Calendar.DAY_OF_WEEK));
        System.out.println(sdf1.format(calendar1.getTime()));
        //获取前一个月第一天
        Calendar calendar2 = Calendar.getInstance();
        calendar2.add(Calendar.MONTH, -1);
        calendar2.set(Calendar.DAY_OF_MONTH,1);
        String firstDay = sdf.format(calendar2.getTime());
        System.out.println ("获取前一个月第一天:"+firstDay);
        //获取前一个月最后一天
        Calendar calendar3 = Calendar.getInstance();
        calendar3.set(Calendar.DAY_OF_MONTH, 0);
        String lastDay = sdf1.format(calendar3.getTime());
        System.out.println ("获取前一个月最后一天:"+lastDay);
        String s2 = getNWeekTimeInterval(1,new SimpleDateFormat("yyyy-MM-dd 00:00:00"),new SimpleDateFormat("yyyy-MM-dd 23:59:59"));
        String a = getThisWeekTimeInterval(new SimpleDateFormat("yyyy-MM-dd 00:00:00"),new SimpleDateFormat("yyyy-MM-dd 23:59:59"));
        String[] s = a.split(",");
        System.out.println(s[0]);
        System.out.println(s[1]);

        System.out.println(getThisWeekTimeInterval(new SimpleDateFormat("yyyy-MM-dd"),new SimpleDateFormat("yyyy-MM-dd 23:59:59"))); // 获得本周的日期区间
        System.out.println(getLastWeekTimeInterval(new SimpleDateFormat("yyyy-MM-dd"),new SimpleDateFormat("yyyy-MM-dd 23:59:59"))); // 获得上周的日期区间

        String s3 = getNWeekTimeInterval(1,new SimpleDateFormat("yyyy-MM-dd"),new SimpleDateFormat("yyyy-MM-dd 23:59:59"));
        System.out.println(s3);
        System.out.println(getDate1(-6,new SimpleDateFormat("yyyy-MM-dd")));
        System.out.println(getDate1(0,new SimpleDateFormat("yyyy-MM-dd")));
        SimpleDateFormat sd1f = new SimpleDateFormat("yyyy");
        System.out.println(Integer.parseInt(sd1f.format(new Date()))-1);

        System.out.println(getDate1(-13,new SimpleDateFormat("yyyy-MM-dd")));
        System.out.println(getDate1(-7,new SimpleDateFormat("yyyy-MM-dd")));

        NumberFormat numberFormat = NumberFormat.getInstance();
        System.out.println(100 * (9 / 3) );
        System.out.println(numberFormat.format(100 * (9 / 3)));


}

结果：