1 package test;
2
3 import java.io.FileInputStream;
4 import java.io.FileOutputStream;
5 import java.nio.ByteBuffer;
6 import java.nio.channels.*;
7
8 public class Test17
9 {
10 public static void main(String[] args) throws Exception
11 {
12 FileChannel fc_in = new FileInputStream("d:/t.txt").getChannel();
13 FileChannel fc_out = new FileOutputStream("d:/out_j.txt").getChannel();
14 for (ByteBuffer buf = ByteBuffer.allocate(1024 * 1024); (fc_in.read(buf)) != -1;)
15 { //缓存大小, 设定我想一次读多大的数据.
16 buf.flip(); //这个相当重要, 想象一下 老式打字机, 把打字真眼移到首页
17 fc_out.write(buf);
18 buf.clear(); //注意这个...写完必须清楚数据, 不然程序就卡在这了.
19 }
20 fc_in.close();
21 fc_out.close();
22 }
23 }
