有没有办法使用Apache的HttpClient获取网站的证书？

Question

有没有办法使用Apache的HttpClient（v4）获取网站的证书详细信息？我可以使用javax.net.ssl.HttpsURLConnection.getServerCertificates()获取网站的证书，但我正在使用Apache的HttpClient进行连接，并希望使用相同的库。

我需要证书的发行者，到期日，算法等信息。

Answer 1

DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.addRequestInterceptor(new HttpRequestInterceptor() {

    public void process(
            HttpRequest request, HttpContext context) throws HttpException, IOException {
        HttpRoutedConnection conn = (HttpRoutedConnection) context.getAttribute(
                ExecutionContext.HTTP_CONNECTION);
        SSLSession sslsession = conn.getSSLSession();
        if (sslsession != null) {
            // Do something useful with the SSL session details
            // and if necessary stick the result to the execution context
            // for further processing
            X509Certificate[] certs = sslsession.getPeerCertificateChain();
            for (X509Certificate cert: certs) {
                System.out.println(cert);
            }
        }
    }
});
HttpResponse response = httpclient.execute(new HttpGet("https://verisign.com/"));
EntityUtils.consume(response.getEntity());

希望这有帮助。