The Java SMS

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.util.EncodingUtil;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;

/**
*    Parameters:
*
*    - accessToken (required)
*    - message (required)
*    - destinataires (required): Receivers separated by a comma
*    - emetteur (optional): Allows to deal with the sms sender
*    - optionStop (optional): Deal with the STOP sms when marketing send (cf. API HTTP documentation)
*    - batchFilePath (required for batch mode): The path of CSV file for sms in Batch Mode
*/

public class ExempleClientHttpAPI {

 private static final String URL = "https://api.smsmode.com/http/1.6/";
 private static final String PATH_SEND_SMS = "sendSMS.do";
 private static final String PATH_SEND_SMS_BATCH = "sendSMSBatch.do";
 private static final String ERROR_FILE = "The specified file does not exist";

 // send SMS with GET method
 public String sendSmsGet(String accessToken, String message, String destinataires, String emetteur, String optionStop) throws IOException {

     HttpClient httpClient = new HttpClient();
     String finalUrl = URL + PATH_SEND_SMS;
     GetMethod httpMethod = new GetMethod(finalUrl);
     httpMethod.addRequestHeader("Content-Type", "plain/text; charset=ISO-8859-15");

     NameValuePair[] params = {
         new NameValuePair("accessToken", accessToken),
         new NameValuePair("message", message),
         new NameValuePair("numero", destinataires),
         new NameValuePair("emetteur", emetteur),
         new NameValuePair("stop", optionStop)
     };

     httpMethod.setQueryString(EncodingUtil.formUrlEncode(params, "ISO-8859-15"));
     httpClient.executeMethod(httpMethod);
     return convertToString(httpMethod.getResponseBodyAsStream()); 
 }

 // send SMS with POST method
 public String sendSmsPost(String accessToken, String message, String destinataires, String emetteur, String optionStop) throws IOException {
     HttpClient httpClient = new HttpClient();
     String finalUrl = URL + PATH_SEND_SMS;
     PostMethod httpMethod = new PostMethod(finalUrl);
     httpMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=ISO-8859-15");

     NameValuePair[] params = {
         new NameValuePair("accessToken", accessToken),
         new NameValuePair("message", message),
         new NameValuePair("numero", destinataires),
         new NameValuePair("emetteur", emetteur),
         new NameValuePair("stop", optionStop)
     };

     httpMethod.setRequestBody(params);
     httpClient.executeMethod(httpMethod);
     return convertToString(httpMethod.getResponseBodyAsStream());
 }

 // send SMS with POST method (Batch)
 public String sendSmsBatch(String accessToken, String batchFilePath, String optionStop) throws IOException {
     File file = new File(batchFilePath);
     if (!file.exists())
         return ERROR_FILE;

     HttpClient httpClient = new HttpClient();
     String finalUrl = URL + PATH_SEND_SMS_BATCH + "?accessToken=" + accessToken + "&stop=" + optionStop;
     PostMethod httpMethod = new PostMethod(finalUrl);

     Part[] parts = new Part[1];
     parts[0] = new FilePart(file.getName(), file, "text/csv", null);

     httpMethod.setRequestEntity(new MultipartRequestEntity(parts, httpMethod.getParams()));
     httpClient.executeMethod(httpMethod);
     return convertToString(httpMethod.getResponseBodyAsStream());
 }

 private String convertToString(InputStream stream) {
     Scanner sc = new Scanner(stream);
     StringBuilder sb = new StringBuilder();
     while(sc.hasNext()){
         sb.append(sc.nextLine());
     }
     return sb.toString();
 }
}