正則匹配數字逗號字符串，並轉爲Integer數組

        RecordMould recordMould = buildRecordMould();
        //獲得逗號字符串
        String sheetIds = CastUtil.toNotNullString(aims_recordmould_info.get("sheetList"));
        List<Integer> ids = null;
        //是否是逗號字符串
        if(Pattern.matches("-?\\d+(,-?\\d+)*", sheetIds)) {//也要匹配負數
            //轉爲數字數組
            Integer[] arr = (Integer[]) ConvertUtils.convert(sheetIds, Integer[].class);
            Arrays.sort(arr);
            ids = new ArrayList<Integer>(Arrays.asList(arr));
        }else {
            ids = new ArrayList<Integer>();
        }

將List<String> 轉爲逗號字符串

org.apache.commons.lang3.StringUtils.join(applyNameList, ",");