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); } }