public static void main(String[] args)
	{
		String url = "http://localhost:82/soap/ninja.php";
		String charset = "UTF-8";
		String param1 = "value1";
		String param2 = "value2";
		// ...
		String query;
		try {
			query = String.format("param1=%s&param2=%s", 
					URLEncoder.encode(param1, charset), 
					URLEncoder.encode(param2, charset));
			postPhp.excutePost(url, query);
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

public class postPhp {
	 public static String excutePost(String targetURL, String urlParameters)
	  {
	    URL url;
	    HttpURLConnection connection = null;  
	    try {
	      //Créer une connexion
	      url = new URL(targetURL);
	      connection = (HttpURLConnection)url.openConnection();
	      connection.setRequestMethod("POST");
	      connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
				
	      connection.setRequestProperty("Content-Length", "" + Integer.toString(urlParameters.getBytes().length));
	      connection.setRequestProperty("Content-Language", "en-US");  
				
	      connection.setUseCaches (false);
	      connection.setDoInput(true);
	      connection.setDoOutput(true);

	      //Envoie requête
	      DataOutputStream wr = new DataOutputStream (
	                  connection.getOutputStream ());
	      wr.writeBytes (urlParameters);
	      wr.flush ();
	      wr.close ();

	      //Avoir la réponse
	      java.io.InputStream is = connection.getInputStream();
	      BufferedReader rd = new BufferedReader(new InputStreamReader(is));
	      String line;
	      StringBuffer response = new StringBuffer(); 
	      while((line = rd.readLine()) != null) {
	        response.append(line);
	        response.append('\r');
	      }
	      rd.close();
	      return response.toString();

	    } catch (Exception e) {

	      e.printStackTrace();
	      System.out.println("ERROR !");
	      return null;

	    } finally {

	      if(connection != null) {
	        connection.disconnect(); 
	      }
	    }
	  }