URLConnection send data to server

I am using the following code to upload a large binary data to a http
server.
URL u = new URL(urlString);
URLConnection c = u.openConnection();
c.setDoOutput(true);
c.setDoInput(true);
c.setUseCaches(false);
// set some request headers
c.setRequestProperty(
"Connection",
"Keep-Alive");
// get codebase of the this (the applet) to use for referer
c.setRequestProperty(
"HTTP_REFERER",
codebase);
c.setRequestProperty(
"Content-Type",
"multipart/form-data; boundary=" + boundary);
DataOutputStream dstream = new
DataOutputStream(c.getOutputStream());
for (int i = 0; i < 1000; i++){
byte[] data = new byte[1000];
data = ....
dstream.write(dataq,0,1000);
dstream.writeBytes("\r\n--" + boundary + "--\r\n");
dstream.flush();
dstream.close();
I found that the data was never sent. If I put the following line after
the code above, however, the data got sent. Why?
c.getInputStream();

Thank you for your post.
I have another question. If the data is not update until I call c.getInputString(), how can I monitor the progress of the upload and display the progress with a JProgressBar?
Thanks,

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Regards,
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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.*;
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public class ThirdExample extends MIDlet {
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display = Display.getDisplay(this);
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getGrade(url);
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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);
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i create a program to send data back to ther server using j2me.
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 {
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c.setRequestMethod(HttpConnection.GET);
c.setRequestProperty("IF-Modified-Since", "10 Nov 2000 17:29:12 GMT");
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Send Data back to the Server

Hi.
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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.
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OutputStream os = null;
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os.close();
if(c != null) {
c.close();
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Hello,
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NSLog(@"
Error");
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