通过Spring-Boot同时提供JSON响应并下载文件

Question

要求：我需要创建一个Rest API，该API可以下载文件以及JSON响应。

我已经有2种不同的API来解决此目的，但是现在我需要将这些API合并为一个。

public ResponseEntity<InputStreamResource> downloadFile1(
            @RequestParam(defaultValue = DEFAULT_FILE_NAME) String fileName) throws IOException {


    MediaType mediaType = MediaTypeUtils.getMediaTypeForFileName(this.servletContext, fileName);
    System.out.println("fileName: " + fileName);
    System.out.println("mediaType: " + mediaType);

    File file = new File(DIRECTORY + "/" + fileName);
    InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

    return ResponseEntity.ok()
            // Content-Disposition
            .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + file.getName())
            // Content-Type
            .contentType(mediaType)
            // Contet-Length
            .contentLength(file.length()) //
            .body(resource);
}

上面是仅返回文件下载的现有代码，但我也需要json响应。

Answer 1

您需要返回多部分内容。 例如看

https://github.com/juazugas/spring-boot-multipart/blob/master/src/main/java/com/example/demo/server/MultiEndpoint.java

编码

@GET
@Produces("multipart/mixed")
public MultipartBody getMulti2(@QueryParam("name") String name) {
    List<Attachment> attachments = new LinkedList<>();
    attachments.add(new Attachment("root", "application/json", service.getEntity(name)));
    attachments.add(new Attachment("image", "application/octet-stream", service.getEntityData(name)));
    return new MultipartBody(attachments, true);
}