java实现文件复制

/**
* 实现文件复制
* oldPath 文件原地址
* newPath 文件新地址
**/
private void copyFile(String oldPath, String newPath) {
        try {
            int bytesum = 0;
            int byteread = 0;
            File oldfile = new File(oldPath);
            if (oldfile.exists()) { //文件存在时
                InputStream inStream = new FileInputStream(oldPath); //读入原文件
                FileOutputStream fs = new FileOutputStream(newPath);
                byte[] buffer = new byte[1444];
                while ((byteread = inStream.read(buffer)) != -1) {
                    bytesum += byteread; //字节数 文件大小
                    fs.write(buffer, 0, byteread);
                }
                inStream.close();
            }
            File file = new File(oldPath);
            if (file.exists()) {
                file.delete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }