java nio 复制文件

周末无聊。学习了一下nio,就拿他写了个读写文件的，和老的比了一下，速度真的快了很多，后来又用FastCopy 这个小工具比了一下，发现速度差不多，FastCopy 比直接右键复制 黏贴要快很多。下面是代码：

package com.lucene.file;

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

public class FileCopy {
	public static String src = "f:\\永远强大.rmvb";
	public static String dist = "f:\\永远强大2.rmvb";

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		long start = System.currentTimeMillis();
		copyOld();
		long end = System.currentTimeMillis();
		System.out.println("nio 用时： " + (end - start));

		long start2 = System.currentTimeMillis();
		copyOld();
		end = System.currentTimeMillis();
		System.out.println("io 用时： " + (end - start2));
	}

	public static void copyOld() {
		File srcFile = new File(src);
		File distFile = new File(dist);
		if (distFile.exists()) {
			distFile.delete();
		}
		try {
			FileInputStream fin = new FileInputStream(srcFile);
			BufferedInputStream buffIn = new BufferedInputStream(fin);

			FileOutputStream fout = new FileOutputStream(distFile);
			BufferedOutputStream buffout = new BufferedOutputStream(fout);
			byte[] bytes = new byte[1024];
			while (buffIn.read(bytes) > 0) {
				buffout.write(bytes);
			}
			fin.close();
			buffIn.close();
			fout.close();
			buffout.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	public static void copyNew() {
		try {
			File srcFile = new File(src);
			File distFile = new File(dist);
			if (distFile.exists()) {
				distFile.delete();
			}

			FileInputStream fin = new FileInputStream(srcFile);
			FileOutputStream fout = new FileOutputStream(distFile);
			FileChannel inChannel = fin.getChannel();
			FileChannel outChannel = fout.getChannel();
			int ByteBufferSize = 1024 * 100;
			ByteBuffer buff = ByteBuffer.allocate(ByteBufferSize);

			while (inChannel.read(buff) > 0) {
				buff.flip();
				if (inChannel.position() == inChannel.size()) {// 判断是不是最后一段数据
					int lastRead = (int) (inChannel.size() % ByteBufferSize);
					byte[] bytes = new byte[lastRead];
					buff.get(bytes, 0, lastRead);
					outChannel.write(ByteBuffer.wrap(bytes));
					buff.clear();
				} else {
					outChannel.write(buff);
					buff.clear();
				}
			}// 这个使用FileChannel 自带的复制
			// outChannel.transferFrom(inChannel, 0, inChannel.size());
			outChannel.close();
			inChannel.close();
			fin.close();
			fout.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}