C# と VB.NET の質問掲示板

■No79894 (初心者 さん) に返信

X509TrustManagerを空で実装してSSLContextに設定して
SSLSocketFactoryを作ってhttpsURLConnectionに設定してって感じで行けるんじゃないかと思います。

public static void main(String[] args) throws NoSuchAlgorithmException, IOException, KeyManagementException {
    TrustManager trustManager = new X509TrustManager() {
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }
    };

    SSLContext sslContext = SSLContext.getInstance("SSL");
    sslContext.init(new KeyManager[0], new TrustManager[] { trustManager }, new SecureRandom());

    URL url = new URL("https://www.google.co.jp/");
    HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url.openConnection();
    httpsURLConnection.setSSLSocketFactory(sslContext.getSocketFactory());

    httpsURLConnection.getHeaderFields().forEach((key, value) -> {
        System.out.printf("%s: %s\n", key, value);
    });
}