Spring Boot Controller export an Excel

Question

I have a java/spring boot application where I want to build an API endpoint that creates and returns a downloadable excel file. Here is my controller endpoint:

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Answer 1

You can use this :

 headers.add("Content-Disposition", "attachment; filename=NAMEOFYOURFILE.xlsx");
ByteArrayInputStream in = fooService.export();
return ResponseEntity
            .ok()
            .headers(headers)
            .body(new InputStreamResource(in));

It will download the Excel file when you call this endpoint.

In your export method in your service, you have to return something like that :

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
        workbook.write(out);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return new ByteArrayInputStream(out.toByteArray());