从servlet响应下载JavaScript格式的Excel

我在其他地方看到过许多类似的问题，但都未能解决这个问题

我想使用ApachePOI（3.17）在我的应用程序中下载一个Excel文档。我在Spring服务中生成文档，然后将其作为响应传递回要下载的JavaScript客户端。但是，文件已损坏，因为“文件格式或文件扩展名无效”

春季服务：

final Workbook workbook = new XSSFWorkbook();
final Sheet sheet = workbook.createSheet("Test");

Row row = sheet.getRow(1);
if (row == null)
{
    row = sheet.createRow(1);
}

Cell cell = row.getCell(0);
if (cell == null)
{
    cell = row.createCell(0);
}

cell.setCellValue("Testing123");

final ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
workbook.write(outByteStream);
outArray = outByteStream.toByteArray();
outByteStream.flush();
outByteStream.close();
workbook.close();

Servlet：

final ByteArrayResource resource = new ByteArrayResource(
                this.downloadService.downloadExcel(request, response, baseRequest));

final HttpHeaders headers = new HttpHeaders();
headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + resource.getFilename());

return ResponseEntity.ok()
        .headers(headers)
        .contentLength(resource.contentLength())
        .contentType(MediaType.parseMediaType("application/vnd.ms-excel"))
        .body(resource);

JavaScript客户端：

var contentTypeHeader = 'application/vnd.ms-excel';
var blob = new Blob([result],{type: contentTypeHeader});
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = filename;
link.click();

---

我哪里出问题了？

好吧，事实上我知道了。我找到了解决问题的解决方案：

我需要在servlet中将文件编码为字符串，然后将其传递给客户机并解码为Blob