以编程方式获取KeyStore的条目类型

KeyStore ks = KeyStore.getInstance("JKS");
ks.load(new FileInputStream("keystore.jks"), "password".toCharArray());

Enumeration<String> aliases = ks.aliases();

while (aliases.hasMoreElements()) {
    String alias = aliases.nextElement();
    boolean isKeyEntry = ks.entryInstanceOf(alias, KeyStore.PrivateKeyEntry.class);
    boolean isCertEntry = ks.entryInstanceOf(alias, KeyStore.TrustedCertificateEntry.class);
    // 判断条目类型并进行相应处理
    if (isKeyEntry) {
        // 处理私钥条目
    } else if (isCertEntry) {
        // 处理证书条目
    }
}

KeyStore.PrivateKeyEntry privateKeyEntry = (KeyStore.PrivateKeyEntry) ks.getEntry(alias, null);
PrivateKey privateKey = privateKeyEntry.getPrivateKey();