HTTP + SSL

//受信認的憑證方式，加入一行程式碼即可

System.setProperty( "java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol" );

URL url = new URL("https://xxx.xxx.xxx");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

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//非受信認的憑證方式

TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager(){
public java.security.cert.X509Certificate[] getAcceptedIssuers(){
return null;
}
public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType){}
public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType){}
}};

SSLContext sc = SSLContext.getInstance("SSL");
sc.init(null, trustAllCerts, new java.security.SecureRandom());

//不判斷Hostname是否正確

HostnameVerifier hv = new HostnameVerifier(){
public boolean verify(String hostname, SSLSession session) {return true;}
};

HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
HttpsURLConnection.setDefaultHostnameVerifier(hv);

URL url = new URL("https://xxx.xxx.xxx");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();