NIO复制文件

1、主要利用FileChannel类的方法

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.lang.Exception;
class  NioDemo
{
	public static void main(String[] args) throws Exception
	{
		if(args.length<2)
			System.out.println("请输入文件路径");
		NioUtils copyUtil = new NioUtils();
		copyUtil.copyFiles(args[0],args[1]);
	}
}

class NioUtils
{
	public void copyFiles(String srcPath,String tarPath) throws Exception
	{
		File srcFile = new File(srcPath);
		File tarFile = new File(tarPath);
		if(srcFile.isDirectory())
		{
			System.out.println("正在创建文件夹：" + srcFile.getName());
			tarFile = new File(tarFile,srcFile.getName());
			tarFile.mkdir();
		}

		File[] files = srcFile.listFiles();
		for(File temFile : files)
		{
			if(temFile.isDirectory())
				copyFiles(temFile.getAbsolutePath(),tarFile.getAbsolutePath());
			else
			{
				String name = temFile.getName();
				System.out.println("正在复制文件：" + name);
				copyFile(temFile,new File(tarFile,name));
			}
		}
	}

	private void copyFile(File temFile,File tarFile)
	{
		try
		{
			FileInputStream fis = new FileInputStream(temFile);
			FileOutputStream fos = new FileOutputStream(tarFile);
			FileChannel fin = fis.getChannel();
			FileChannel fout = fos.getChannel();
			ByteBuffer bytebuf = ByteBuffer.allocate(1024);
			while(true)
			{
				bytebuf.clear();
				if(fin.read(bytebuf) == -1)
					break;
				bytebuf.flip();
				fout.write(bytebuf);
			}

			fis.close();
			fos.close();
		}
		catch (Exception ex)
		{
			System.out.println(ex.getMessage());
		}
	}
}