Java 获取从当前时间往前推12月 “年-月” 的时间统计

java代码：

/**
     * 获取当前系统时间最近12月的年月（含当月）
     */
    public static String[] getLast12Months(Date timeDay){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        String time = sdf.format(timeDay);
        //处理月份输入条件
        if(time.length()==7){
            time=time+"-01 00:00:00";
        }else if(time.length()==110){
            time=time.substring(0,7)+"-01 00:00:00";
        }
        Date date = new Date();
        SimpleDateFormat sdp = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        try {
            date= sdp.parse(time);
        } catch (Exception e) {
            return null;
        }
        String[] last12Months = new String[12];
        Calendar cal = Calendar.getInstance();
        //设置输入条件时间
        cal.setTime(date);
        //要先+1,才能把本月的算进去
        cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)+1);
        for(int i=0; i<12; i++){
            //逐次往前推1个月
            cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)-1);
            last12Months[11-i] = cal.get(Calendar.YEAR)+ "-" + addZeroForNum(String.valueOf(cal.get(Calendar.MONTH)+1), 2);
            System.out.println(cal.get(Calendar.MONTH));
            System.out.println(last12Months[i]);
        }
        return last12Months;
    }
    public static String addZeroForNum(String str, int strLength) {
        int strLen = str.length();
        if (strLen < strLength) {
            while (strLen < strLength) {
                StringBuffer sb = new StringBuffer();
                // 左补0
                sb.append("0").append(str);
                // sb.append(str).append("0");//右补0
                str = sb.toString();
                strLen = str.length();
            }
        }
        return str;
    }

 在Controller层直接调用：

 获取到的是String类型的数组

可以通过以下方法转换为List

List last12MonthsList= Arrays.asList(last12Months);