编码和解码

public static String toBase64String(String value) throws UnsupportedEncodingException {
    if (value == null || value.isEmpty()) {
        return "";
    }
    byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
    return java.net.URLEncoder.encode(new String(Base64.getEncoder().encode(bytes)), "UTF-8");
}

public static String UnBase64String(String value) throws UnsupportedEncodingException {
    if (value == null || value.isEmpty()) {
        return "";
    }
    String decodeValue= java.net.URLDecoder.decode(value, "UTF-8");
    byte[] decodedBytes = Base64.getDecoder().decode(decodeValue);
    return new String(decodedBytes,StandardCharsets.UTF_8);
}