spring boot https PKCS12 DerInputStream.getLength() lengthTag=111，太大

使用Spring Boot构建应用程序时，我们经常会遇到一些问题和挑战。其中之一是在配置HTTPS时可能会遇到PKCS12 DerInputStream.getLength()：lengthTag=111的错误。这个错误提示告诉我们输入的长度太大了，导致无法正确解析PKCS12证书。在本文中，我们将深入探讨这个问题，并提供解决方案和示例代码。

java
@SpringBootApplication
public class MyApp {
    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
    @Bean
    public ServletWebServerFactory servletContainer() {
        // 创建使用HTTPS的连接工厂
        TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
        factory.addAdditionalTomcatConnectors(createSslConnector());
        return factory;
    }
    private Connector createSslConnector() {
        // 创建SSL连接器
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
        try {
            // 配置SSL连接器的证书信息
            File keystore = new ClassPathResource("keystore.p12").getFile();
            File truststore = new ClassPathResource("truststore.p12").getFile();
            connector.setScheme("https");
            connector.setSecure(true);
            connector.setPort(8443);
            protocol.setSSLEnabled(true);
            protocol.setKeystoreFile(keystore.getAbsolutePath());
            protocol.setKeystorePass("password");
            protocol.setTruststoreFile(truststore.getAbsolutePath());
            protocol.setTruststorePass("password");
            protocol.setKeyAlias("alias");
            return connector;
        } catch (IOException ex) {
            throw new IllegalStateException("Failed to create SSL connector.", ex);
        }
    }
}