java 移动文件并删除原文件

需求是这样的，先上传文件，因为只传文件没有办法生成一级目录文件夹，传过来参数又不好取，所以就先上传，然后后面提交的时候移动文件到新的目录：

public static String moveFile(String name, String path, String number) throws IOException {
        //移动文件夹
        File fromPath = new File(path + File.separator + name);
　　　　 //这个url不要new File,否则outStream的地方报错,拼出来的路径是：D:/resources/uploads/123/abc.png
        String url = path + File.separator + number + File.separator + name;
        FileChannel in = null;
        FileChannel out = null;
        FileInputStream inStream = null;
        FileOutputStream outStream = null;
        try {
            inStream = new FileInputStream(fromPath);
            File toPath = new File(path + File.separator + number);
            System.out.println("fileUrl: " + toPath);
            if (!toPath.exists()) {
                toPath.mkdirs();
            }

            outStream = new FileOutputStream(url);
            in = inStream.getChannel();
            out = outStream.getChannel();
            IOUtils.copy(inStream, outStream);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            inStream.close();
            in.close();
            outStream.close();
            out.close();
            //删除原来文件，必须等流关闭后才能删除
            fromPath.deleteOnExit();
        }
　　　　　　 //这是存入数库的路径
        String imagePath = "/uploads/" + number + "/"+ name;
        return imagePath;
    }