数字前面填充0工具类

曾经终败给现在 2024-03-16 09:48 14阅读 0赞

工具类

public class ParamUtil {
        
    
        //检查是否为数字
        private static final Pattern pattern = Pattern.compile("[0-9]*");
        //检查是否为01-99之间的数字
        private static final Pattern pattern2 = Pattern.compile("^([1-9]|0[1-9]|[1-9][0-9])$");
        //检查是否大于0小于等于100的整数
        private static final Pattern pattern1 = Pattern.compile("^100$|^([1-9]|[1-9]\\d)$");
    
        public static <T> ReqBody<T> checkRequest(ReqBody<T> reqBody) {
        
            if (reqBody == null) {
        
                throw new GlobalErrorInfoException(StockErrorInfoEnum.REQBODY_EMPTY);
            }
            if (reqBody.getParam() == null) {
        
                throw new GlobalErrorInfoException(StockErrorInfoEnum.PARAM_EMPTY);
            }
            return reqBody;
        }
    
        /**
         * 填充0
         *
         * @param number      需要填充的数
         * @param totalDigits 填充的总位数
         * @return
         */
        public static String filling(String number, Integer totalDigits) {
        
            boolean flag = StringUtils.isEmpty(number) && (null == totalDigits || totalDigits < 2);
            if (flag) {
        
                return null;
            }
            String newNumBer = number;
            int length = newNumBer.length();
            if (length < totalDigits) {
        
                for (int i = 1; i <= totalDigits - length; i++) {
        
                    newNumBer = "0".concat(newNumBer);
                }
            }
            return newNumBer;
        }
    
        /**
         * 检查字符串是否为数字
         *
         * @param str
         * @return
         */
        public static boolean checkStrIsNum(String str) {
        
    
            if(StringUtils.isBlank(str)){
        
                return true;
            }
    
            Matcher isNum = pattern2.matcher(str);
            return isNum.matches();
        }
    
        /**
         * 检查字符是否为大于0小于等于100
         *
         * @param smartPi
         * @return
         */
        public static boolean checkSmartPi(String smartPi) {
        
    
            if(StringUtils.isBlank(smartPi)){
        
                return true;
            }
            Matcher isNum = pattern1.matcher(smartPi);
            return isNum.matches();
        }
    }

调用示例：

/* 前面补0，凑成2位数。如：9补0后是：09 */
    String department = ParamUtil.filling(department2, 2);