Download Pic From URL - Simple Java I/O Code

I got a very simple code:

InputStream inputStream = null;
OutputStream outputStream = null;
try {
URL url = new URL(imgfm);
inputStream = url.openStream();
outputStream = new FileOutputStream(imgto);
 byte[] buffer = new byte[2048];
int length;

[Code] ....

I have several pic to download (e.g 30) however, the code work for some pic (workable for a random number of pic, sometimes workable for 10 pics but sometime can only download 1 pics).

I try to input several println code to found out the problem. finally i found that all the code stop (it's stop as when i use debug process in eclipse, it get no respond) and the final appear code under console is:

2048
Start abc/testing.jpg
Finished
2048
Start abc/testing.jpg
Finished
2048
Start abc/testing.jpg
Finished
1935
Start abc/testing.jpg
Finished

It cant even go to "System.out.println("Can come to here!");"