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Pure Java implementation for JSON Web Token (JWT)

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package com.rongjih.jwt;

import javax.json.Json;
import javax.json.JsonObject;
import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * The base class for JWT Header and Payload
 *
 * @author RJ
 * @since JDK1.8
 */
abstract class Base {
	/**
	 * Convert this instance to JsonObject.
	 * @return this instance JsonObject
	 */
	abstract JsonObject toJson();

	private String base64;

	/**
	 * Encode this instance to base64url-string with 'UTF-8' charset.
	 * attention: This method's result would be cache by first invoked.
	 * So each time you invoked, you get the same result.
	 *
	 * @return The encoded base64url-string.
	 */
	public String encode() {
		// System.out.println(toJson());
		if (base64 == null)
			base64 = new String(
					Base64.getUrlEncoder().encode(toJson().toString().getBytes(StandardCharsets.UTF_8)),
					StandardCharsets.UTF_8
			);
		return base64;
	}

	static JsonObject decodeToJson(String base64) {
		return Json.createReader(new ByteArrayInputStream(Base64.getUrlDecoder().decode(base64)))
				.readObject();
	}
}