Java实现文件夹的复制，包括子文件夹与文件

package com.test.file;

import sun.java2d.pipe.BufferedBufImgOps;

import java.io.*;

public class RecursionDir {

        //copy directory and files
        public static void copyDir(String oldPath,String newPath) throws Exception{
            File src = new File(oldPath);
            File tar = new File(newPath);
            File[] fs = src.listFiles();

            //create target directory
            if(!tar.exists()){
                tar.mkdirs();
            }

            //get current dir's files and dirs
            for(File f:fs){
                if(f.isFile()){
                    //copy file
                    copyFile(f,new File(newPath+"//"+f.getName()));
                }else if(f.isDirectory()){
                    //recursion
                    copyDir(f.getPath(),newPath+"//"+f.getName());
                }
            }
        }

        //copy files
        public static void copyFile(File src,File tar) throws Exception{
            //create inputStream buffer
            FileInputStream fis = new FileInputStream(src);
            BufferedInputStream bif = new BufferedInputStream(fis);

            //create outputStream buffer
            FileOutputStream fos = new FileOutputStream(tar);
            BufferedOutputStream bos = new BufferedOutputStream(fos);

            //buffer array
            byte[] bs = new byte[1024];
            int len;
            while((len=bif.read(bs))!=-1){
                bos.write(bs,0,len);
            }
            bos.flush();


            //close stream
            fis.close();
            fos.close();
            bif.close();
            bos.close();

        }

}