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common utils like IOUtil,StrUtil,HoldProcessor.etc.

There is a newer version: 1.8.5

package top.jfunc.common.utils;

import java.math.BigInteger;

/**
 * 进制转换类
 * @author 熊诗言2017/11/28
 */
public class RadixUtil {
    private RadixUtil(){}

    /**
     * 进制转换
     * @param src 原数字串
     * @param radixFrom 数字串的进制
     * @param radixTo 要转换的进制
     * @return 转换后的字符串
     * @see Character#MIN_RADIX
     * @see Character#MAX_RADIX
     * @see Integer#toString(int, int)
     * @see Integer#parseInt(String, int)
     * @see Integer#valueOf(String, int)
     */
    public static String radix(String src , int radixFrom , int radixTo){
        BigInteger bigInteger = new BigInteger(src, radixFrom);
        return bigInteger.toString(radixTo);
    }

    /**
     * 字节数组转换为16进制字符串, 大写
     * @param b 字节数字
     * @return 十六进制字符串 小写
     */
    public static String toHex(byte[] b){
        return toHexLower(b).toUpperCase();
    }

    /**
     * 字节数组转换为16进制字符串, 小写
     * @param bs 字节数组
     * @return 十六进制字符串 小写
     */
    public static String toHexLower(byte[] bs){
        StringBuilder hexString = new StringBuilder();
        for (byte b : bs) {
            String plainText = Integer.toHexString(0xff & b);
            if(plainText.length() < 2){
                plainText = "0" + plainText;
            }
            hexString.append(plainText);
        }
        return hexString.toString();
    }

    /**
     * 16进制字符串转换为字节数组
     * @param hex 十六进制字符串
     * @return 字节数组
     */
    public static byte[] toBytes(String hex){
        byte[] digest = new byte[hex.length() / 2];
        for(int i = 0; i < digest.length; i++){
            String byteString = hex.substring(2 * i, 2 * i + 2);
            int byteValue = Integer.parseInt(byteString, 16);
            digest[i] = (byte)byteValue;
        }
        return digest;
    }
}