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Here is the JAVA sample code, 

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JsonFormatter JSON_FORMATTER = new PrettyJsonFormatter();
 String jsonText = JSON_FORMATTER.format(json);
 
 // initialize the POST method
 HttpPost httppost = new HttpPost(szPrimaryServerURL + "/das5/rest/register/queryAgent");
 httppost.setEntity(new StringEntity(jsonText));

// execute the POST
 HttpClient httpclient = prepareHttpClient(szPrimaryServerURL);
 HttpResponse response = httpclient.execute(httppost);
 InputStream is = response.getEntity().getContent();

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 private static HttpClient prepareHttpClient(String szPrimaryServerURL)
 {
 try
 {
 URL url = new URL(szPrimaryServerURL);
 if(url.getProtocol().toLowerCase().equals("https"))
 {
 KeyStore keystore = KeyStore.getInstance("pkcs12");
 InputStream keystoreInput = dshelper.class.getResourceAsStream("/res/regagentpass.pfx");
 // TODO get the keystore as an InputStream from somewhere
 keystore.load(keystoreInput, "changeit".toCharArray());
 
 KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
 keyManagerFactory.init(keystore, "changeit".toCharArray());
 
 SSLContext sslContext = SSLContext.getInstance("SSL");

// set up a TrustManager that trusts everything
 sslContext.init(keyManagerFactory.getKeyManagers(), new TrustManager[] { new X509TrustManager() {
 public X509Certificate[] getAcceptedIssuers() {
// System.out.println("getAcceptedIssuers =============");
 return null;
 }

public void checkClientTrusted(X509Certificate[] certs,
 String authType) {
// System.out.println("checkClientTrusted =============");
 }

public void checkServerTrusted(X509Certificate[] certs,
 String authType) {
// System.out.println("checkServerTrusted =============");
 }
 } }, new SecureRandom());

SSLSocketFactory sf = new SSLSocketFactory(sslContext);
// SSLSocketFactory sf = new SSLSocketFactory(keystore, "changeit");
 
 Scheme httpsScheme = new Scheme("https", url.getPort(), sf);
 SchemeRegistry schemeRegistry = new SchemeRegistry();
 schemeRegistry.register(httpsScheme);

HttpParams params = new BasicHttpParams();
 ClientConnectionManager cm = new SingleClientConnManager(schemeRegistry);
 HttpClient httpclient = new DefaultHttpClient(cm, params); 
 return httpclient;
 }
 else
 {
 HttpClient httpclient = new DefaultHttpClient();
 return httpclient;
 }
 
 } catch (Exception e)
 {
 return null;
 }
 
 }

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If you use HttpsURLConnection, don't forget to set content type as application/json.

URL url = new URL(urlPath);
HttpsURLConnection connect = (HttpsURLConnection)url.openConnection();
connect.setDoInput(true);
connect.setDoOutput(true);
connect.setUseCaches(false);

connect.setRequestMethod("POST");
connect.setRequestProperty("Connection", "Keep-Alive");
connect.setRequestProperty("Content-Type","application/json"); //which is important

JSONObject payload; //compose it in advance
DataOutputStream stream = new DataOutputStream(connect.getOutputStream());
stream.write(payload.toString().getBytes("UTF-8"));
stream.flush();
stream.close();

You may ask where to get the right client certificate? Well, you need to register an API agent in DualShield Management Console,

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For the actual parameter to HttpPost and post data, please see the details in our DualShield REST API Programming Guide.pdf and DualShield REST API Reference.pdf