从JWT.jks中读取公钥与私钥

最新推荐文章于 2025-03-03 17:14:14 发布

原创最新推荐文章于 2025-03-03 17:14:14 发布 · 1k 阅读

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本文详细讲解如何使用Java从JWT的.jks密钥库文件中提取公钥和私钥，这对于验证JWT令牌和签署新的JWT至关重要。通过Java KeyStore API，你可以轻松地管理和使用这些密钥。



@SpringBootApplication
public class DemojwtApplication {


    // 寻找证书文件
    private static InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("token.jks");
    private static PrivateKey privateKey = null;
    private static PublicKey publicKey = null;

    public static void main(String[] args) {
        SpringApplication.run(DemojwtApplication.class, args);
        System.out.println("hello");


        try {
            KeyStore keyStore = KeyStore.getInstance("JKS");
            keyStore.load(inputStream, "密码".toCharArray());

            privateKey = (PrivateKey) keyStore.getKey("key的别名", "密码".toCharArray());

            System.out.println(encryptBASE64(privateKey.getEncoded()));

            publicKey = keyStore.getCertificate("key的别名").getPublicKey();

            System.out.println(encryptBASE64(publicKey.getEncoded()));

        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    //编码返回字符串
    public static String encryptBASE64(byte[] key) throws Exception {
        return (new BASE64Encoder()).encodeBuffer(key);
    }

}