文件通道流两个实例

1.  两句话实现复制，通道连接

1. package com.eshore.sweetop.io;
3. import java.io.FileInputStream;
4. import java.io.FileOutputStream;
5. import java.nio.channels.FileChannel;
7. public class TransferTo {
8.     public static void main(String[] args) throws Exception {
9.         FileChannel in = new FileInputStream("test.out").getChannel(), out = new FileOutputStream(
10.                 "test.out.bak").getChannel();
11.         in.transferTo(0, in.size(), out);
12.     }
13. }
14. 
    

2. 映射内存文件

2. import java.io.RandomAccessFile;
3. import java.nio.ByteBuffer;
4. import java.nio.channels.FileChannel;
5. import java.nio.channels.FileChannel.MapMode;
7. public class TestChannel {
8.     public static void main(String[] args) throws Exception {
9.         FileChannel fc=new RandomAccessFile("test.out","rw").getChannel();
10.         ByteBuffer cb=fc.map(MapMode.READ_WRITE, 0, fc.size());
11.         byte[] b=new byte[cb.capacity()];
12.         for (int i = 0; i < b.length; i++) {
13.             b[i]=cb.get(i);
14.         }
15.         System.out.println(new String(b));
16.     }
17. }