GCM Mock server code

GcmMockServer.java

package com.dnn.zapbuild.dnn.helper;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

/**

 * A very simple program which pretends to be a "server" in that it sends
 * a notification to the Google Cloud Messaging Server to cause it to send
 * a message to our GCM Client.
 * @author Ian Darwin, http://androidcookbook.com/
 */

public class GcmMockServer {

    /** Confidential Server API key gotten from the Google Dev Console ->
     * Credentials -> Public API Access -> Key for Android Apps */
    final static String AUTH_KEY="";    // set in a static initializer, not shown, key for

    final static String POST_URL = "https://android.googleapis.com/gcm/send";

    public static void main(String[] args) throws Exception {

        final String[][]  MESSAGE_HEADERS = {
                {"Content-Type", "application/json"},
                { "Authorization", "key=" + AUTH_KEY}
        };

        String regIdFromClientApp = ""; // has to be set somehow!

        String jsonMessage =
                "{\n" +
                        "    \"registration_ids\" : [\""+ regIdFromClientApp + "\"],\n" +
                        "    \"data\" : {\n" +
                        "        \"message\": \"hellobrother@;;;@http://www.helpme.com/\"\n" +
                        "    }\n" +
                        "}\n";

        // Dump out the HTTP send for debugging
        for (String[] hed : MESSAGE_HEADERS) {
            System.out.println(hed[0] + "=>" + hed[1]);
        }
        System.out.println(jsonMessage);

        // Actually send it.
        sendMessage(POST_URL, MESSAGE_HEADERS, jsonMessage);
    }

    private static void sendMessage(String postUrl, String[][] messageHeaders,
                                    String jsonMessage) throws IOException {
        HttpURLConnection conn = (HttpURLConnection) new URL(postUrl).openConnection();
        for (String[] h : messageHeaders) {
            conn.setRequestProperty(h[0], h[1]);
        }
        System.out.println("Connected to " + postUrl);
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);       // ensure response always from server

        PrintWriter pw = new PrintWriter(
                new OutputStreamWriter(conn.getOutputStream()));

        pw.print(jsonMessage);
        pw.close();

        System.out.println("Connection status code " + conn.getResponseCode());
    }

}