jwt使用rsa加密时报错（main方法测试始终正确，一使用web运行就报错）

错误信息

java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=13, too big.

原因：多线程引起的并发问题（更具体的原因不清楚）。

解决：使用synchronized （或者Lock，我懒得用Lock了）

	/**
	 * 从文件中获取公钥
	 * 
	 * @param publicKeyFilePath
	 *            文件路径
	 * @return
	 */
	public synchronized static PublicKey getPublicKey(String publicKeyFilePath) throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
		return getPublicKey(new FileInputStream(publicKeyFilePath));
	}

	/**
	 * 从文件中获取公钥
	 * 
	 * @param publicKeyFilePath
	 *            classpath中的文件相对路径（只有文件名都行，ClassLoader.getResourceAsStream会自行搜索）
	 * @return
	 */
	public synchronized static PublicKey getPublicKeyClasspath(String publicKeyFilePath) throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
		return getPublicKey(RsaKeyUtil.class.getClassLoader().getResourceAsStream(publicKeyFilePath));
	}

	/**
	 * 从字节输入流中获取公钥
	 * 
	 * @param publicKeyInput
	 * @return
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 * @throws InvalidKeySpecException
	 */
	public synchronized static PublicKey getPublicKey(InputStream publicKeyInput) throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
		try (InputStream input = publicKeyInput; DataInputStream dis = new DataInputStream(input)) {
			byte[] keyBytes = new byte[input.available()];
			dis.readFully(keyBytes);
			X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
			KeyFactory kf = KeyFactory.getInstance("RSA");
			return kf.generatePublic(spec);
		}
	}

	public synchronized static PublicKey getPublicKey64(String publicKeyFilePath) throws Exception {
		return getPublicKey64(new FileInputStream(publicKeyFilePath));
	}

	public synchronized static PublicKey getPublicKey64Classpath(String publicKeyFilePath) throws Exception {
		return getPublicKey64(RsaKeyUtil.class.getClassLoader().getResourceAsStream(publicKeyFilePath));
	}

	public synchronized static PublicKey getPublicKey64(InputStream publicKeyInput) throws Exception {
		try (InputStream input = publicKeyInput) {
			String key64 = FileUtil.readAllString(input);
			byte[] keyByte = Base64Util.decodeBase64(key64);
			X509EncodedKeySpec spec = new X509EncodedKeySpec(keyByte);
			KeyFactory kf = KeyFactory.getInstance("RSA");
			return kf.generatePublic(spec);
		}
	}