有沒有辦法使用Apache的HttpClient獲取網站的證書？

Question

有沒有辦法使用Apache的HttpClient（v4）獲取網站的證書詳細信息？我可以使用javax.net.ssl.HttpsURLConnection.getServerCertificates()獲得網站證書，但我使用的是Apache的HttpClient用於我的連接，並且希望使用相同的庫。

我需要像證書的頒發者，到期算法等

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()); 

希望這有助於信息。