@Test
public void test2() {
RandomAccessFile fromFile = new RandomAccessFile("fromFile.txt", "rw");
FileChannel fromChannel = fromFile.getChannel();
RandomAccessFile toFile = new RandomAccessFile("toFile.txt", "rw");
FileChannel toChannel = toFile.getChannel();
long position = 0;
long count = fromChannel.size();
//从from 读到 本通道;注意socketfrom只会发送已经准备好的,不会发送count个
toChannel.transferFrom(fromChannel,position, count);
//将本通道 写到 to;注意sockedfrom会一直发送,直到to被填满
fromChannel.transferTo(position, count, toChannel);
}
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