FileChannel 使用

1. 
import java.io.File;
2. import java.io.FileInputStream;
3. import java.io.FileNotFoundException;
4. import java.io.FileOutputStream;
5. import java.io.IOException;
6. import java.nio.ByteBuffer;
7. import java.nio.channels.FileChannel;
8. 
9. 
10. public class ChannelDemo2
11. {
12. 
13.     public static void main(String [] args)
14.     {
15.         File fin = new File("F:"+File.separator+"4399.txt");
16.         File fout = new  File("F:"+File.separator+"5026.txt");
17. 
18.         FileInputStream fis = null;
19.         FileOutputStream fos = null;
20.         try {
21.             fis = new FileInputStream(fin);
22.             fos = new FileOutputStream(fout,false);
23. 
24. 
25. 
26.         FileChannel fcis = fis.getChannel(); //获取 输入  输出流的通道
27.         FileChannel fcos = fos.getChannel(); 
28. 
29.         ByteBuffer sb = ByteBuffer.allocate(1024);
30. 
31.         int len =0;
32.         while((len = fcis.read(sb))!=-1)
33.         {
34.             sb.flip();
35.             fcos.write(sb);
36.             sb.clear();
37.         }
38. 
39.         fis.close();
40.         fos.close();
41.         fcis.close();
42.         fcos.close();
43. 
44.         } catch (FileNotFoundException e) {
45.             e.printStackTrace();
46.         }catch(IOException e)
47.         {
48.             e.printStackTrace();
49.         }
50.     }
51. 
52. }