JAVA FILE or I/O学习

public class CopyFiles
{
    public static void main(String[] args)
    {
        CopyFiles copyFiles = new CopyFiles();
        copyFiles.copyS("E:\", "【    图 片    】", "E:\cba");
    }
    public void copyS(String sourcePath,String name,String newPath)
    {
        File file = new File(sourcePath, name);
        if (file.isDirectory())
        {
            //在新位置创建该文件夹
            File fileDir = new File(newPath, name);
            if (!fileDir.exists())
            {
                fileDir.mkdir();
                System.out.println("复制文件夹："+fileDir);
            }
            else {
                JOptionPane.showMessageDialog(null, "新路径中已经存在该文件！
"+fileDir, "复制文件 - 提示", JOptionPane.WARNING_MESSAGE);
                return;
            }
            
            //操作原位置文件夹中的文件、文件夹
            File[] nextFiles = file.listFiles();
            if (nextFiles.length == 0)
            {
                return;
            }
            else {
                for (File fileNext : nextFiles)
                {
                    copyS(file.getAbsolutePath(), fileNext.getName(), fileDir.getAbsolutePath());
                }
            }
        }
        else {
            //复制文件
            byte[] data = new byte[1024];
            try
            {
                BufferedInputStream input = new BufferedInputStream(new FileInputStream(file));
                File fileNew = new File(newPath, name);
                if (fileNew.exists())
                {
                    JOptionPane.showMessageDialog(null, "新路径中已经存在该文件！
"+fileNew, "复制文件 - 提示", JOptionPane.WARNING_MESSAGE);
                    return;
                }
                fileNew.createNewFile();
                System.out.println("复制文件："+fileNew);
                BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(fileNew));
                while (input.read(data) != -1)
                {
                    output.write(data);

                }
                output.flush();
                output.close();
                input.close();
            } catch (FileNotFoundException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}