java nio 实现文件读写

package com.cloudcore.usercenter.consumer.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class NioFileReadAndWrite {

	public static void main(String[] args) {
		File from = new File("d:\\from.pdf");
		File to = new File("d:\\to.pdf");
		try {
			nioCopyFile(from, to);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * nio实现文件复制
	 * 
	 * @param from
	 * @param to
	 * @throws IOException
	 */
	public static final void nioCopyFile(File from, File to) throws IOException {
		FileInputStream fin = null;
		FileOutputStream fout = null;
		FileChannel fic = null;
		FileChannel foc = null;
		try {
			fin = new FileInputStream(from);
			fout = new FileOutputStream(to);
			fic = fin.getChannel();
			foc = fout.getChannel();
			ByteBuffer bb = ByteBuffer.allocate(1024 << 4);
			while (fic.read(bb) > 0) {
				bb.flip();
				foc.write(bb);
				bb.clear();
			}
		} finally {
			if (null != fic)
				fic.close();
			if (null != foc)
				foc.close();
			if (null != fin)
				fin.close();
			if (null != fout)
				fout.close();
		}
	}
}