检查X509证书是否已被撤销？

Question

以下代码是我目前拥有的代码。它从服务器获取证书，并检查有效性。但是，我想知道如何添加支票以查看它是否已被撤销？ （我知道如果我得到它，并立即检查它，它不会被撤销，但我会在解决之后修改它，以便稍后检查它。）我最初问过类似的问题，当我不知道自己想做什么时，因为它被写了而删除了它。提前谢谢！

protected boolean testCert() throws Exception
{
    // Get the current environment.

    Environment myTestEnvironment = Environment.valueOf(env);
    URL verificationUrl =  environmentService.getProfile(myTestEnvironment).getConnectUrl();
    boolean result = false;

    HttpsURLConnection conn = (HttpsURLConnection) verificationUrl.openConnection();
    conn.connect();

    Certificate[] certs = conn.getServerCertificates();

    // This is set in order to have a readable output for debugging.
    this.testURL = verificationUrl.toString().replaceFirst("^(https://www\\.|https://|www\\.)","");

    for (Certificate cert : certs) {
        if (cert instanceof X509Certificate) {
            try {
                ((X509Certificate) cert).checkValidity();
                result = true;
            } catch (CertificateExpiredException cee) {
                result = false;}
        }
    }
    return result;
}