Reading and writting a large file using Java NIO

Question

How can I effectively read from a large file and write bulk data into a file using the Java NIO framework.

I\'m working with ByteBuffer and

Answer 1

while ((bytesCount = in.read(bytebuf)) > 0) { 
        // flip the buffer which set the limit to current position, and position to 0.
        bytebuf.flip();
        out.write(bytebuf); // Write data from ByteBuffer to file
        bytebuf.clear(); // For the next read
    }

Your copy loop is not correct. It should be:

while ((bytesCount = in.read(bytebuf)) > 0 || bytebuf.position() > 0) { 
        // flip the buffer which set the limit to current position, and position to 0.
        bytebuf.flip();
        out.write(bytebuf); // Write data from ByteBuffer to file
        bytebuf.compact(); // For the next read
    }

Can anybody tell, should I follow the same procedure if my file size [is] more than 2 GB?

Yes. The file size doesn't make any difference.