package com.zq;

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

/**
 * 使用NIO对文件进行快速拷贝
 */
public class FileCopy {
	
	public static void fileCopy( File in, File out )throws IOException {  
		FileChannel inChannel = new FileInputStream( in ).getChannel();  
		FileChannel outChannel = new FileOutputStream( out ).getChannel();  
		try {  
		    int maxCount = (64 * 1024 * 1024) - (32 * 1024);  
		    long size = inChannel.size();  
		    long position = 0;  
		    while ( position < size ) {  
		       position += inChannel.transferTo( position, maxCount, outChannel );  
		    }  
		}  
		finally {  
		    if ( inChannel != null ) {  
		       inChannel.close();  
		    }  
		    if ( outChannel != null ) {  
		        outChannel.close();  
		    }  
		}  
	} 
	
	public static void main(String[] args) {
		File in = new File("E:\\zq\\1.JPG");
		File out = new File("E:\\zq.JPG");
		try {
			FileCopy.fileCopy(in, out);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

}