Java java.nio写入[]行

Question

I am using java.nio to copy a file, it copies fine except for the fact that there is a line of []s at the end of the file.

Here is my code:

source (the source channel)
source.read(buffer);
buffer.flip();
mbb.put(buffer)
mbb is MappedByteBuffer

Source Channel:

source = new FileInputStream(original(this is a File)).getChannel();

MappedByteBuffer:

source.map(FileChannel.MapMode.READ_WRITE, 0, 1024);

Answer 1

You are assuming the file is 1024 bytes long instead of using the actual file size. I suspect the junk is in the MappedByteBuffer rather than the file.