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();
     }
 }