文件下载不带临时文件的Java

@WebServlet("/download")
public class FileDownloadServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String filePath = "path/to/file"; // 文件路径，根据实际情况进行修改

        File file = new File(filePath);
        String fileName = file.getName();

        // 设置响应头，告诉浏览器文件的类型和下载时的文件名
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");

        // 使用输入流读取文件内容，并通过输出流将文件发送给客户端
        try (InputStream inputStream = new FileInputStream(file);
             OutputStream outputStream = response.getOutputStream()) {
            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
        }
    }
}