java nio 实现的文件复制

package cn.com.nio;

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

public class CopyFile {

	/**
	 * NIO实现的文件复制功能
	 * @param sourceFile 源文件路径
	 * @param targetFile 目标文件路径
	 */
	public void readerFile(String sourceFile,String targetFile) throws Exception {
		// 第一步：获取通道
		FileInputStream fin = new FileInputStream(sourceFile);  //输入
		FileOutputStream fou = new FileOutputStream(targetFile); //输出
		
		FileChannel fc = fin.getChannel();
		FileChannel fo = fou.getChannel();
		// 第二步：创建缓冲区
		ByteBuffer buffer = ByteBuffer.allocate(1024);
		while (true) {
			buffer.clear();
			int r = fc.read(buffer);
			if (r == -1) {
				break;
			}
			buffer.flip();
			fo.write(buffer);
		}
	}

	public static void main(String[] args) throws Exception {
		CopyFile test = new CopyFile();
		test.readerFile("D:/Test/TypesInByteBuffer.java","D:/Test.txt");
	}
}