原文链接：http://tutorials.jenkov.com/java-nio/channel-to-channel-transfers.html，如有侵权，立删
Java NIO Channel to Channel Transfers
- transferFrom（）
- transferTo（）
如果两个channel中有一个是filechannel，那么两个channel就可以互相传输数据。
TransferFrom()
FileChannel.transferFrom()将一个channel中的数据传输到FileChannel中去。上例子
1 RandomAccessFile fromFile = new RandomAccessFile("fromFile.txt", "rw"); 2 FileChannel fromChannel = fromFile.getChannel(); 3 4 RandomAccessFile toFile = new RandomAccessFile("toFile.txt", "rw"); 5 FileChannel toChannel = toFile.getChannel(); 6 7 long position = 0; 8 long count = fromChannel.size(); 9 10 toChannel.transferFrom(fromChannel, position, count);
一些SocketChannel实现可能只会传输已经准备好的数据，即使还有正在准备的很多可用数据。因此SocketChannel可能不会传输全部的数据到FileChannel中。
TransferTo()
FileChannel.transferTo()是FileChannel向其他的channel传输数据。
1 RandomAccessFile fromFile = new RandomAccessFile("fromFile.txt", "rw"); 2 FileChannel fromChannel = fromFile.getChannel(); 3 4 RandomAccessFile toFile = new RandomAccessFile("toFile.txt", "rw"); 5 FileChannel toChannel = toFile.getChannel(); 6 7 long position = 0; 8 long count = fromChannel.size(); 9 10 fromChannel.transferTo(position, count, toChannel);
这里SocketChannel，还是老毛病。