BaseConverter

BaseConverter.java

package com.github.arbing.common.utils;

import org.apache.commons.lang3.StringUtils;

public class BaseConverter {
    private final static String baseMap = "96735ecfd824b1a0";

    /**
     * 从10进制转换
     *
     * @param number 要转换的数字
     * @return 转换后
     */
    public static String convertFromDecimal(long number) {
        int baseTo = baseMap.length();
        StringBuffer sum = new StringBuffer();
        while (number != 0) {
            long remainder = number % baseTo;
            sum.insert(0, baseMap.charAt((int) remainder));
            number /= baseTo;
        }
        return sum.toString();
    }

    /**
     * 转换成10进制
     *
     * @param str 要转换的数字
     * @return 转换后
     */
    public static long convertToDecimal(String str) {
        int baseFrom = baseMap.length();
        long sum = 0;
        str = StringUtils.reverse(str);
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            long val = baseMap.indexOf(ch);
            sum += val * Math.pow(baseFrom, i);
        }
        return sum;
    }
}