package btp.oneP;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

public class ChannelCopy {

private static final int BSIZE = 1024;

public static void main(String[] args) throws IOException {

FileChannel in = new FileInputStream("C:\\Users\\dell\\Desktop\\IO\\channelIn.txt").getChannel(),

out = new FileOutputStream("C:\\Users\\dell\\Desktop\\IO\\channelOut.txt").getChannel();

ByteBuffer buffer = ByteBuffer.allocate(BSIZE);

while(in.read(buffer) != -1){

//写完之后：limit = capacity;position = 实际数据大小

buffer.flip();//limit->position;position->0

out.write(buffer);

buffer.clear();//limit->capacity;position->0;准备下一路的读

}

}

}