NIO的使用（FileInputStream/FileOutputStream）
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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 test4 {static public void main(String args[]) {FileInputStream fis = null;FileOutputStream fos = null;ByteBuffer bb = ByteBuffer.allocate(1024);try {fis = new FileInputStream("C:\\source.txt");fos = new FileOutputStream("C:\\copy.txt");FileChannel fci = fis.getChannel();FileChannel fco = fos.getChannel();while (-1 != fci.read(bb)) {bb.flip();fco.write(bb);bb.clear();}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (null != fis) {try {fis.close();} catch (IOException e) {e.printStackTrace();}}if (null != fos) {try {fos.close();} catch (IOException e) {e.printStackTrace();}}}}}