Why read() doesn't read?

Question

Hi!
Please check out the code piece:
URL aurl = new URL("http://somesite.com/mypic.jpg");
URLConnection uc = aurl.openConnection();
uc.connect();
BufferedInputStream bis = new BufferedInputStream(uc.getInputStream());
File f = new File("mypiccopy.jpg");
FileOutputStream fos = new FileOutputStream(f);
//now comes the hard part:
int avail = 1;
byte mybyte;
while(avail > 0) {
    avail = bis.available(); //..does return the num of available bytes
    mybyte = new byte[avail];
    bis.read(mybyte,0,avail); //..is supposed to read from buffer
    fos.write(mybyte); //..is supposed to write to the file
fos.close();
bis.close();It does return the available number of bytes, but never reades or writes anything. The size of the file will be 0.
What's wrong??

Answer 1

But the code is still bad!
Having added the outputting line slowed the program down so that there always was some input available within every exceution of the loop - but that is only by chance!
If once the connection was slower than your client -maybe due to some network problem- , avail would get set to 0 and your loop would get prematruely terminated.
The point is that available() "returns the number of bytes that can be read from this input stream without blocking"
and you might need blocking (like when you try to read more bytes than available) form the channel.