Send FREE SMS in Java - Receive FREE SMS in Java

Description

Send FREE SMS in Java - Receive FREE SMS in Java using your android mobile device as GSM Modem device or SMS Gateway. You will find great guide and easy steps to learn; How to send or Receive FREE SMS in your Java project.

In this video tutorial we will go step by step to write sample code for sending or receiving FREE SMS in your Java project. Before getting started you must have installed GSM Modem android application in your device so that you could send or receive SMS from your mobile device.

Prerequisites

Before getting started you must have prerequisites.

You must have an android device.
GSM Modem Application must be installed on your device.
GSM Helper Tool must be installed on your device.
In GSM Modem Application both Servers are started (first for sending sms, second for receiving sms).
Following Java Jars must be added in your project, comm-2.0, http-2.2.1 and mysql-connector-java-5.1.45-bin.

Code for Sending SMS

Let's write code for sending SMS in Java first. In following Java code you will find message, phone, username, password, address and port of your android device where GSM modem application is listening for input. Create URL from the variable and hit the GET request to device. In the response you see status of the message.

Filename: SMSSender.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

public class SMSSender {

	public static void main(String[] args) throws Exception{
		// TODO Auto-generated method stub
		String message = "Junk characters? method sendMultipartTextMessage only send text message. If you want to send non text message, you should look to method sendDataMessage. Below is the code excerpt from android cts. It has example on how to send long messages.";		
		String phone = "03008083466";
		String username = "abcd";
		String password = "1234";
		String address = "http://192.168.1.101";
		String port = "8090";
		
		URL url = new URL(
				address+":"+port+"/SendSMS?username="+username+"&password="+password+
				"&phone="+phone+"&message="+URLEncoder.encode(message,"UTF-8"));
		
		URLConnection connection = url.openConnection();
		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String inputLine;
		while((inputLine = bufferedReader.readLine()) !=null){
			System.out.println(inputLine);
		}
		bufferedReader.close();
		

	}

}

Code for Receiving SMS

In receiving SMS code, We have made HttpServer our own for listening on particular address and port. The above Jars are required for this Java program. In this program we are making complete header request and hostname and port for the use. The listening address and port number must be entered in your device for forward message from your device to Java project.

Filename: MyHttpServer.java

import java.io.UnsupportedEncodingException;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpServer;

public class MyHttpServer {
    private static final String HOSTNAME = "192.168.1.109";
    private static final int PORT = 8080;
    private static final int BACKLOG = 1;

    private static final String HEADER_ALLOW = "Allow";
    private static final String HEADER_CONTENT_TYPE = "Content-Type";

    private static final Charset CHARSET = StandardCharsets.UTF_8;

    private static final int STATUS_OK = 200;
    private static final int STATUS_METHOD_NOT_ALLOWED = 405;

    private static final int NO_RESPONSE_LENGTH = -1;

    private static final String METHOD_GET = "GET";
    private static final String METHOD_OPTIONS = "OPTIONS";
    private static final String ALLOWED_METHODS = METHOD_GET + "," + METHOD_OPTIONS;
    
    public static void main(final String... args) throws Exception {
        final HttpServer server = HttpServer.create(new InetSocketAddress(HOSTNAME, PORT), BACKLOG);
        server.createContext("/receiveSMS", he -> {
            try {
            	            	
                final Headers headers = he.getResponseHeaders();
                final String requestMethod = he.getRequestMethod().toUpperCase();
                switch (requestMethod) {
                    case METHOD_GET:
                        final Map<String, List<String>> requestParameters = getRequestParameters(he.getRequestURI());
                        // do something with the request parameters      
                        String phoneNumber = null;
                        String message = null;
                        
                        for(Map.Entry<String, List<String>> entry : requestParameters.entrySet()){                        	
                        	if ("phoneNumber".equals(entry.getKey())){
                        		phoneNumber = entry.getValue().get(0);
                        	}else if ("message".equals(entry.getKey())){
                        		message = entry.getValue().get(0);
                        	}
                        }
                        
                        System.out.println("Phone: "+ phoneNumber);
                        System.out.println("Message: "+ message);

                                                                                           
                        final String responseBody = "{status:200,message:successfully added}";
                        headers.set(HEADER_CONTENT_TYPE, String.format("application/json; charset=%s", CHARSET));
                        final byte[] rawResponseBody = responseBody.getBytes(CHARSET);
                        he.sendResponseHeaders(STATUS_OK, rawResponseBody.length);
                        he.getResponseBody().write(rawResponseBody);
                        break;
                    case METHOD_OPTIONS:
                        headers.set(HEADER_ALLOW, ALLOWED_METHODS);
                        he.sendResponseHeaders(STATUS_OK, NO_RESPONSE_LENGTH);
                        break;
                    default:
                        headers.set(HEADER_ALLOW, ALLOWED_METHODS);
                        he.sendResponseHeaders(STATUS_METHOD_NOT_ALLOWED, NO_RESPONSE_LENGTH);
                        break;
                }
            }catch(Exception ex){ex.printStackTrace();}         
            finally {
                he.close();                
            }
        });
        server.start();
        System.out.println("Server is started!");
        
    }

    private static Map<String, List<String>> getRequestParameters(final URI requestUri) {
        final Map<String, List<String>> requestParameters = new LinkedHashMap<>();
        final String requestQuery = requestUri.getRawQuery();
        if (requestQuery != null) {
            final String[] rawRequestParameters = requestQuery.split("[&;]", -1);
            for (final String rawRequestParameter : rawRequestParameters) {
                final String[] requestParameter = rawRequestParameter.split("=", 2);
                final String requestParameterName = decodeUrlComponent(requestParameter[0]);
                requestParameters.putIfAbsent(requestParameterName, new ArrayList<>());
                final String requestParameterValue = requestParameter.length > 1 ? decodeUrlComponent(requestParameter[1]) : null;
                requestParameters.get(requestParameterName).add(requestParameterValue);
            }
        }
        return requestParameters;
    }

    private static String decodeUrlComponent(final String urlComponent) {
        try {
            return URLDecoder.decode(urlComponent, CHARSET.name());
        } catch (final UnsupportedEncodingException ex) {
            throw new InternalError(ex);
        }
    }
}

Send FREE SMS in Java - Receive FREE SMS in Java

Prerequisites

Code for Sending SMS

Code for Receiving SMS

Latest Tutorials

Latest Video Tutorials

Latest MCQs