IO查找文件复制到指定路径

public class IOTest {
    // 存储获取的文件绝对路径
    private static List<String> list = new ArrayList<String>();
    public static void main(String[] args) {
        File file = new File("D:/holle");
        Long sta = System.currentTimeMillis();
        mkdirAll(file);
        for(String str : list){
            String[] split = str.split("\\\\");
            try {
                IO(str, "D:/"+split[split.length-1]);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        Long end = System.currentTimeMillis();
        System.out.println("用时"+(end-sta));
    }
    
    
    private static void mkdirAll(File file){
        File[] f = file.listFiles();
        for (File file2 : f) {
            // 递归算法，如果有子文件夹继续向下查找
            if(file2.isDirectory()){
                mkdirAll(file2);
            }else{
                list.add(file2.toString());
            }
        }
    }
    
    public static void IO(String file,String newFile)throws IOException{
        //源
        File f1 = new File(file);
        File f2 = new File(newFile);
        //流
        FileInputStream fis = new FileInputStream(f1);
        FileOutputStream fos = new FileOutputStream(f2);
        //读
        byte[] data = new byte[1024 * 1024];
        //写
        int len = 0;
        while((len = fis.read(data)) != -1){
            fos.write(data, 0, len);
        }
        //关
        fis.close();
        fos.close();    
    }
}