java复制文件夹中的所有文件和文件夹到另一个文件夹中

package com.gblfy.ly.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileUtils {
    /**
     * 复制整个文件夹内容
     * @param oldPath String 原文件路径 如：c:/fqf
     * @param newPath String 复制后路径 如：f:/fqf/ff
     * @return boolean
     */
    public static void copyFolder(String oldPath, String newPath) {
        try {
            (new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹
            File a=new File(oldPath);
            String[] file=a.list();
            File temp=null;
            for (int i = 0; i < file.length; i++) {
                if(oldPath.endsWith(File.separator)){
                    temp=new File(oldPath+file[i]);
                }
                else{
                    temp=new File(oldPath+ File.separator+file[i]);
                }
                if(temp.isFile()){
                    FileInputStream input = new FileInputStream(temp);
                    FileOutputStream output = new FileOutputStream(newPath + "/" +
                            (temp.getName()).toString());
                    byte[] b = new byte[1024 * 5];
                    int len;
                    while ( (len = input.read(b)) != -1) {
                        output.write(b, 0, len);
                    }
                    output.flush();
                    output.close();
                    input.close();
                }
                if(temp.isDirectory()){//如果是子文件夹
                    copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
                }
            }
        }
        catch (Exception e) {
            System.out.println("复制整个文件夹内容操作出错");
            e.printStackTrace();
        }
    }
    public static void copyDir(String oldPath, String newPath) throws IOException {
        File file = new File(oldPath);        //文件名称列表
        String[] filePath = file.list();

        if (!(new File(newPath)).exists()) {
            (new File(newPath)).mkdir();
        }

        for (int i = 0; i < filePath.length; i++) {
            if ((new File(oldPath + file.separator + filePath[i])).isDirectory()) {
                copyDir(oldPath  + file.separator  + filePath[i], newPath  + file.separator + filePath[i]);
            }

            if (new File(oldPath  + file.separator + filePath[i]).isFile()) {
                copyFile(oldPath + file.separator + filePath[i], newPath + file.separator + filePath[i]);
            }

        }
    }
    public static void copyFile(String oldPath, String newPath) throws IOException {
        File oldFile = new File(oldPath);
        File file = new File(newPath);
        FileInputStream in = new FileInputStream(oldFile);
        FileOutputStream out = new FileOutputStream(file);;

        byte[] buffer=new byte[2097152];

        while((in.read(buffer)) != -1){
            out.write(buffer);
        }
    }
    public static void main(String[] args) throws IOException {
        String oldPath="D:\\222\\data\\22";
        String newPath="D:\\222\\data\\55";
        long forStrTime = 0L;
        long forEndTime = 0L;
        forStrTime = System.currentTimeMillis();
        System.out.println("开始进行图片转换:" + forStrTime + "毫秒");

       // copyFolder(oldPath, newPath) ;//1419毫秒
         copyDir(oldPath, newPath) ;//1099 毫秒
        forEndTime = System.currentTimeMillis();
        System.out.println("图片转换结束时间:" + forEndTime + "毫秒");
        long endToStart = (long) (forEndTime - forStrTime);
        System.out.println("图片转换消耗的时间:" + endToStart + "毫秒");

    }
}