NIO复制文件夹详解 - 黑马程序员技术交流社区

package sample;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
class CopyFile{
protected File sourceF;
protected File targetF;
CopyFile(File sourceF,File targetF){
this.sourceF=sourceF;
this.targetF=targetF;
}
@SuppressWarnings("resource")
//文件的复制
public void Copy() throws IOException{
if(targetF.isDirectory())
{
targetF.mkdirs();
//在目标文件夹中建立和目标文件同名的文件
targetF=new File(targetF.getAbsolutePath()+"\\"+sourceF.getName());
}
FileChannel in = new FileInputStream(sourceF).getChannel();//得到输入通道
FileChannel out = new FileOutputStream(targetF).getChannel();//得到输出通道
ByteBuffer buffer = ByteBuffer.allocate(1024);//设定缓冲区
while(in.read(buffer) != -1){
buffer.flip();//准备写入，防止其他读取，锁住文件
out.write(buffer);
buffer.clear();//准备读取。将缓冲区清理完毕，移动文件内部指针
}
in.close();
out.close();
}
}
class CopyDirectory {
private String sourceD;
private String targetD;
CopyDirectory(String sourceD, String targetD) {
this.sourceD=sourceD;
this.targetD=targetD;
}
//文件夹的复制
public void Copy() throws IOException{
//System.out.println(sourceD);
String[] sF=new File(sourceD).list();
String sTemp=targetD+"\\"+new File(sourceD).getName();//在目标文件夹中建立和源文件同名文件夹
File tF=new File(sTemp);
tF.mkdirs();
for (int i = 0; i < sF.length; i++){
if(new File(sourceD+"\\"+sF[i]).isFile())
{
System.out.println(sourceD+"\\"+sF[i]+2);
File sourceF=new File(sourceD+"\\"+sF[i]);
File targetF=tF;
new CopyFile(sourceF,targetF).Copy();
}
else if(new File(sourceD+"\\"+sF[i]).isDirectory())
{
sourceD=sourceD+"\\"+sF[i];
System.out.println(sourceD+1);
targetD=sTemp;
new CopyDirectory(sourceD,targetD).Copy();
}
}
//File[] file=new File(sourceD).listFiles();
}
}
public class Sample2 {
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String sourceD="C:\\新建文件夹";
String targetD="E:\\新建文件夹";
new CopyDirectory(sourceD,targetD).Copy();
}
}

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