import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayDeque;public class CopyFile {public static void main(String[] args) {File f1 = new File("kkk");File f2 = new File("D:\\");try {getPathBFS(f1,f2);} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}}/*** 用于读和写* @param f1 输入流* @param f2 输出流*/private static void copyFile(File f1,String f2){InputStream in = null;OutputStream out = null;try {in = new BufferedInputStream(new FileInputStream(f1));out = new BufferedOutputStream(new FileOutputStream(f2));byte by[] = new byte[1024];int len = 0;while((len = in.read(by))!=-1){out.write(by, 0, len);}} catch (FileNotFoundException e) {e.printStackTrace();}catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}finally{if(in!=null){try {in.close();} catch (IOException e) {// TODO Auto-generated catch block
                    e.printStackTrace();}}if(out != null){try {out.close();} catch (IOException e) {// TODO Auto-generated catch block
                    e.printStackTrace();}}}}/*** 用于搜索* @param f1 目标文件* @param f2 复制到的目标* @throws IOException*/private static void getPathBFS(File f1,File f2) throws IOException {//运用队列进行广度搜索ArrayDeque<File> deque = new ArrayDeque<File>();//用于存储复制目标文件ArrayDeque<File> dequeCopy = new ArrayDeque<File>();//第一个File实例入队
        deque.offer(f1);//创建第一个文件夹f2 = new File(f2,f1.getName());dequeCopy.offer(f2);//队列为空时停止while(!deque.isEmpty()){//取队头File[] ff = deque.peek().listFiles();File copyFiledir = dequeCopy.peek();//创建文件夹
            copyFiledir.mkdir();//出队
            deque.poll();dequeCopy.poll();for(int i=0;i<ff.length;i++){//如果是目标文件夹入队if(ff[i].isDirectory()){//复制文件夹入队File temp = new File(copyFiledir,ff[i].getName());dequeCopy.push(temp);deque.push(ff[i]);}else{//复制到相应文件夹copyFile(ff[i],copyFiledir.getAbsolutePath()+"\\"+ff[i].getName());}}}}}