dataOutputStream.readFully 的进度

Question

I'm receiving a file using dataInputStream.readFully, so i'd like to show the progress of the transmision. Is it possible to know the progress of readFully method? Thank you.

Answer 1

No - the whole point is that it's a single call to make it simpler to read.

If you want to read more gradually (eg to update a progress bar) you can just read a chunk at a time with InputStream.read(byte[], int, int) in a loop until you've read all the data. For example:

byte[] data = new byte[bytesToRead];
int offset = 0;
int bytesRead;
while ((bytesRead = stream.read(data, offset, data.length - offset)) > -1) {
    offset += bytesRead;
    // Update progress indicator
}

This is just like the JDK 8 code for readFully , but with progress indication in the loop.