Send Data back to the Server

Question

Hi.
how to send data back to the server using J2ME or how to communicate with server using J2ME

Answer 1

i am using http its work well on emulator but when i install the application on sony ericsssin p910i or k700i or nokia 7710 then its not working and simply hang.
here is sample code which is run well on emulator but not on mobile.
what is the problem in that or how can this code run in mobile is there any mobile specific setting or internet setting.
Pls reply asap.
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
* An example MIDlet to invoke a CGI script.
public class ThirdExample extends MIDlet {
private Display display;
// String url = "http://www.javacourses.com/cgi-bin/getgrade.cgi?idnum=182016";
String url = "http://sampler.infopro.stpn.soft.net/midletdata.asp?name=name";
public ThirdExample() {
display = Display.getDisplay(this);
* Initialization. Invoked when we activate the MIDlet.
public void startApp() {
     try {
getGrade(url);
     } catch (IOException e) {
     System.out.println("IOException " + e);
     e.printStackTrace();
* Pause, discontinue ....
public void pauseApp() {
* Destroy must cleanup everything.
public void destroyApp(boolean unconditional) {
* Retrieve a grade....
void getGrade(String url) throws IOException {
HttpConnection c = null;
InputStream is = null;
OutputStream os = null;
StringBuffer b = new StringBuffer();
TextBox t = null;
int x = 5, y =7;
try {
c = (HttpConnection)Connector.open(url);
c.setRequestMethod(HttpConnection.GET);
c.setRequestProperty("IF-Modified-Since", "10 Nov 2000 17:29:12 GMT");
c.setRequestProperty("User-Agent","Profile/MIDP-1.0 Confirguration/CLDC-1.0");
c.setRequestProperty("Content-Language", "en-CA");
os = c.openOutputStream();
String str = "?idnum=182016";
byte postmsg[] = str.getBytes();
for(int i=0;i<postmsg.length;i++) {
os.writeByte(postmsg);
os.flush();
is = c.openDataInputStream();
int ch;
while ((ch = is.read()) != -1) {
b.append((char) ch);
System.out.println((char)ch);
t = new TextBox("Final Grades", b.toString(), 1024, 0);
} finally {
if(is!= null) {
is.close();
if(os != null) {
os.close();
if(c != null) {
c.close();
display.setCurrent(t);