基本思路就是边搜索边复制，这里用的是广度搜索(BFS)

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
     
       deque = new ArrayDeque
      
       ();        //用于存储复制目标文件        ArrayDeque
       
         dequeCopy = new ArrayDeque
        
         ();        //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