java app显示数字格式化以万、亿为单位转换，如1.7万

阳光穿透心脏的1/2处 2023-10-02 16:41 9阅读 0赞

/**
         * 数字格式化显示
         *
         * <p>小于万默认显示 大于万以1.7万方式显示最大是9999.9万
         *
         * <p>大于亿以1.1亿方式显示最大没有限制都是亿单位
         *
         * @param num
         *     <p>格式化的数字
         * @param kBool
         *     <p>是否格式化千,为true,并且num大于999就显示999+,小于等于999就正常显示
         * @return
         */
        public static String formatNum(String num, Boolean kBool) {
            StringBuffer sb = new StringBuffer();
    
            if (!StringUtils.isNumeric(num)) {
                return "0";
            }
    
            if (kBool == null) {
                kBool = false;
            }
    
            BigDecimal b0 = new BigDecimal("1000");
    
            BigDecimal b1 = new BigDecimal("10000");
    
            BigDecimal b2 = new BigDecimal("100000000");
    
            BigDecimal b3 = new BigDecimal(num);
    
            String formatNumStr = "";
    
            String nuit = "";
    
            // 以千为单位处理
    
            if (kBool) {
                if (b3.compareTo(b0) == 0 || b3.compareTo(b0) == 1) {
                    return "999+";
                }
    
                return num;
            }
    
            // 以万为单位处理
    
            if (b3.compareTo(b1) == -1) {
                sb.append(b3.toString());
    
            } else if ((b3.compareTo(b1) == 0 && b3.compareTo(b1) == 1) || b3.compareTo(b2) == -1) {
    
                formatNumStr = b3.divide(b1).toString();
    
                nuit = "万";
    
            } else if (b3.compareTo(b2) == 0 || b3.compareTo(b2) == 1) {
                formatNumStr = b3.divide(b2).toString();
    
                nuit = "亿";
            }
    
            if (!"".equals(formatNumStr)) {
                int i = formatNumStr.indexOf(".");
    
                if (i == -1) {
                    sb.append(formatNumStr).append(nuit);
    
                } else {
                    i = i + 1;
    
                    String v = formatNumStr.substring(i, i + 1);
    
                    if (!v.equals("0")) {
                        sb.append(formatNumStr.substring(0, i + 1)).append(nuit);
    
                    } else {
                        sb.append(formatNumStr.substring(0, i - 1)).append(nuit);
                    }
                }
            }
    
            if (sb.length() == 0) {
                return "0";
            }
    
            return sb.toString();
        }

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