我想实现一个方法，该方法从数据库下载一个包含表格记录的 .xls 文件。我正在工作中没有任何模板，以便专注于后端。问题是，当我运行应用程序和相应的方法时，下载没有开始，记录会“显示”在屏幕上。
ClienteService：
@Override
public ByteArrayInputStream exportData() throws Exception {
    String[] columnas = {"Núm. Cliente", "Nombre", "Apellido", "Dirección", "Activo"};
    Workbook workbook = new HSSFWorkbook();
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    Sheet sheet = workbook.createSheet("Clientes");
    Row row = sheet.createRow(0);
    for (int i = 0; i < columnas.length; i++) {
        Cell cell = row.createCell(i);
        cell.setCellValue(columnas[i]);
    }
    List<E01_cliente> clientes = (List<E01_cliente>) clienteRepository.findAll();
    int initRow = 1;
    for (E01_cliente c : clientes) {
        row = sheet.createRow(initRow);
        row.createCell(0).setCellValue(c.getNro_cliente());
        row.createCell(1).setCellValue(c.getNombre());
        row.createCell(2).setCellValue(c.getApellido());
        row.createCell(3).setCellValue(c.getDireccion());
        row.createCell(4).setCellValue(c.isActivo());
        initRow++;
    }
    workbook.write(stream);
    workbook.close();
    return new ByteArrayInputStream(stream.toByteArray());
}
Controller 的方法：
@GetMapping("/descargar")
public ResponseEntity<InputStreamResource> exportData() throws Exception {
    ByteArrayInputStream stream = clienteService.exportData();
    HttpHeaders headers = new HttpHeaders();
    headers.add("Content-Disposition", "attachment; filename=clientes.xls");
    return ResponseEntity.ok().headers(headers).body(new InputStreamResource(stream));
}
Entity Cliente：
@Entity
public class E01_cliente {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int nro_cliente;
    private String nombre;
    private String apellido;
    private String direccion;
    private boolean activo;
    @OneToMany(mappedBy = "cliente")
    @JsonIgnore
    private List<E01_factura> facturas;
    // 省略了 Getter 和 Setter
}

headers.add("Content-Disposition", "attachment; filename=clientes.xls");