java 文件处理

public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = null;
        OutputStream os = null;
        try {
            fileInputStream = new FileInputStream("E:" + File.separator + "templet" + File.separator + "123.xlsx");
            File file = new File("E:" + File.separator + "123.xlsx");
            os = new FileOutputStream(file);
            int bytesRead = 0;
            byte[] buffer = new byte[8192];
            while ((bytesRead = fileInputStream.read(buffer, 0, 8192)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
        } catch (IOException e) {
            System.out.println("IOException");
            e.printStackTrace();
        } finally {
            if (fileInputStream != null) {
                fileInputStream.close();
            }
            if (os != null) {
                os.close();
            }
        }
    }