Angular 4.3:使用新的HttpClient获取一个arraybuffer [英] Angular 4.3: Getting an arraybuffer with new HttpClient

问题描述

我想更改为新的HttpClient.到目前为止，我处理以下文件下载:

I would like to change to the new HttpClient. Until now I handle file downloads the following:

getXlsx (): Observable<any> {
    return this.http.get('api/xlsx', {
      responseType: ResponseContentType.ArrayBuffer, // set as ArrayBuffer instead of Json
    })
    .map(res => downloadFile(res, 'application/xlsx', 'export.xlsx'))
    .catch(err => handleError(err));
  }

export function downloadFile(data: any, type: string, filename: string): string {
  const blob = new Blob([data._body], { type });
  const url = window.URL.createObjectURL(blob);

  // create hidden dom element (so it works in all browsers)
  const a = document.createElement('a');
  a.setAttribute('style', 'display:none;');
  document.body.appendChild(a);

  // create file, attach to hidden element and open hidden element
  a.href = url;
  a.download = filename;
  a.click();
  return url;
}

将responseeType更改为'arraybuffer'将导致文件为空.有任何解决方法的想法吗?

Changing the respondeType to 'arraybuffer' will result in empty files. Any ideas how to solve it?

推荐答案

所以Martin解决了我的问题:

So Martin has solved my issue:

getXlsx (): Observable<any> {
    return this.http.get('api/xlsx', {
      responseType: 'blob' // <-- changed to blob
    })
    .map(res => downloadFile(res, 'application/xlsx', 'export.xlsx'))
    .catch(err => handleError(err));
  }

export function downloadFile(blob: any, type: string, filename: string): string {
  const url = window.URL.createObjectURL(blob); // <-- work with blob directly

  // create hidden dom element (so it works in all browsers)
  const a = document.createElement('a');
  a.setAttribute('style', 'display:none;');
  document.body.appendChild(a);

  // create file, attach to hidden element and open hidden element
  a.href = url;
  a.download = filename;
  a.click();
  return url;
}

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