src/main/java/me/codeboy/common/base/security/CBMd5Sha.java
private static String hex(byte[] arr) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < arr.length; ++i) {
            sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,
                    3));
        }
        return sb.toString();
    }
private static String hex(byte[] arr) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < arr.length; ++i) {
            sb.append(Integer.toHexString((arr[i] & 0xFF) | 0x100).substring(1,
                    3));
        }
        return sb.toString();
    }
字节转换为16进制

@param arr
字节数组
@return 16进制字 串