Несколько параметров в сервлете URL
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"¶m2="+lon);
Better Beetle
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"¶m2="+lon);