String、StringHex和byte[]之间的转换

1. 将普通字符串转换为16进制字符串

/**
 * 将普通字符串转换为16进制字符串
 * @param str 普通字符串
 * @param charset 编码格式，一般传UTF-8
 * @return
 * @throws UnsupportedEncodingException
 */
public static String str2HexStr(String str,String charset) throws UnsupportedEncodingException {
    return Hex.encodeHexString(str.getBytes(charset));
}

2.将16进制字符串转换为普通字符串

/**
 * 将16进制字符串转换为普通字符串
 * @param hexStr 16进制字符串
 * @param charset 编码格式
 * @return
 * @throws DecoderException
 * @throws UnsupportedEncodingException
 */
public static String hexStr2Str(String hexStr,String charset) throws DecoderException, UnsupportedEncodingException {
    byte[] bytes = Hex.decodeHex(hexStr);
    return new String(bytes,charset);
}
3.16进制字符转数组

/**
 * 16进制字符转数组
 * @param hex16Str
 * @return
 */
public static byte[] conver16HexToByte(String hex16Str){
    char[] chars = hex16Str.toCharArray();
    byte[] b = new byte[chars.length/2];
    for (int i = 0; i < b.length; i++) {
        int pos = i * 2;
        b[i] = (byte) ("0123456789ABCDEF".indexOf(chars[pos]) << 4 | "0123456789ABCDEF".indexOf(chars[pos+1]));
    }
    return b;
}

4.数组转16进制字符

/**
 * 数组转16进制字符
 * @param bytes
 * @return
 */
public static String bytesToHex(byte[] bytes){
    StringBuffer sb =new StringBuffer();
    for (int i = 0; i < bytes.length; i++) {
        String hex = Integer.toHexString(bytes[i] & 0xFF);
        if(hex.length() < 2){
            sb.append(0);
        }
        sb.append(hex);
    }
    return sb.toString().toUpperCase();
}