Advanced Services - SMS Connectivity JAVA Sample application using HTTP

The following sample application written in Java sends an SMS message to a single mobile telephone. The application uses HTTP to communicate with HSL's systems and is run from the command line.

package com.haysystems.examples;

import java.net.*;
import java.io.*;
import java.security.*;

/**
 * A simple example class that sends some text via the HSL HTTP gateway.
 *
 * @see HSL ADVANCED SERVICES SMS GATEWAY - HTTP INTERFACE (revision 4)
 */
public class HTTPExample {
    public static void main(String[] args) {
        // Storage for the data that will be extracted from the command-line.
        String clientIdentifier = null;
        String text = null;
        String GSMNumber = null;
        String secret = null;

        // Process command-line parameters.
        for(int i = 0; i < args.length; i++) {
            if(args[i].startsWith("clientid="))
                clientIdentifier = args[i].substring(args[i].indexOf("=") + 1);
            else if(args[i].startsWith("text="))
                text = args[i].substring(args[i].indexOf("=") + 1);
            else if(args[i].startsWith("number="))
                GSMNumber = args[i].substring(args[i].indexOf("=") + 1);
            else if(args[i].startsWith("secret="))
                secret = args[i].substring(args[i].indexOf("=") + 1);
            else {
                printUsage();
                return;
            }
        }

        // Check that we've actually got all 4 parameters.
        if(clientIdentifier == null || text == null || GSMNumber == null || secret == null) {
            printUsage();
            return;
        }

        // Compute the MD5 digest for the message
        String MD5Digest = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");

            md.update(secret.getBytes());
            md.update(text.getBytes());
            byte[] digest = md.digest(GSMNumber.getBytes());
            for(int i = 0; i < digest.length; i++)
                MD5Digest += Integer.toString(Math.abs(digest[i]), 16);
        } catch(NoSuchAlgorithmException nsae) {
            System.err.println("HTTPExample: NoSuchAlgorithmException; " + nsae.getMessage());
            return;
        }

        try {
            // Set up the connection.
            URL url = new URL("http://sms.hsl.uk.com/sendtxt/");
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoOutput(true);
            connection.setDoInput(true);

            // Get the output stream and write the parameters
            PrintStream out = new PrintStream(connection.getOutputStream());
            out.print("clientid=" + clientIdentifier + "&text=" + text
                + "&gsmno=" + GSMNumber + "&key=" + MD5Digest);
            out.close();

            // Read the response
            BufferedReader in = new BufferedReader(
                new InputStreamReader(
                    connection.getInputStream()));
            String response = in.readLine();
            in.close();

            // Process the result.
            if(response.equals("FAIL"))
                System.err.println("HTTPExample: Send failed.");
            else if(response.equals("FAIL AUTH"))
                System.err.println("HTTPExample: Send failed due to authentication failure.");
            else if(response.startsWith("SUCCESS"))
                System.out.println("HTTPExample: Send succeeded.\n  (" + response + ")");

        } catch(MalformedURLException mue) {
            System.err.println("HTTPExample: MalformedURLException; " + mue.getMessage());
        } catch(ProtocolException pe) {
            System.err.println("HTTPExample: ProtocolException; " + pe.getMessage());
        } catch(IOException ioe) {
            System.err.println("HTTPExample: IOException; " + ioe.getMessage());
        }
    }

    private static void printUsage() {
        System.err.println("com.haysystems.examples.HTTPExample: usage...");
        System.err.println("  client ID, text and gsm number required in format \"key=value\"");
        System.err.println("  e.g. clientid=foo");
        System.err.println("  valid keys are: secret, clientid, text and number");
        System.err.println("  note: key ordering is unimportant");
    }
}

Copyright © Hay Systems Ltd 2001-2007

Owner: support@haysystems.com 25 June 2007