如何在Angular 4中下载excel/Zip文件

Question

我使用角4作为前端,而内腔5.4作为后端.

我的要求是将一些数据导出为ex​​cel和zip文件.

使用{ saveAs }从'file-saver/FileSaver';包导入文件下载.

Angular 4代码:

downloadExcel() {

const type = 'application/vnd.ms-excel';
const headers = { headers: new Headers({ 'Accept': type }) };
const filename = 'file.xls';

this.http.get('http://10.2.2.109/Download/exportExcel', headers)
  .toPromise()
  .then(response => this.saveToFileSystem(response, type, filename));

return false;


}



private saveToFileSystem(response, __type, filename) {
    const contentDispositionHeader: string = response.headers.get('Content-Disposition');

if (contentDispositionHeader !== null) {
  const parts: string[] = contentDispositionHeader.split(';');
  //const filename = parts[1].split('=')[1];
  const blob = new Blob([response._body], { type: __type });
  saveAs(blob, filename);
} else {
  alert('Cant download.....');
  // handling download condition if content disposition is empty
  const blob = new Blob([response._body], { type: __type });
  saveAs(blob, filename);
}


}

流明代码

public function exportExcel(Request $request) {
        $file = storage_path();
        $file_name = 'book1.xls';
        $headers = [
            'Content-type' => 'application/vnd.ms-excel',
            'Content-Disposition' => 'attachment;filename="' . $file_name,
            'X-Filename' => $file_name,
            'Content-Transfer-Encoding' => 'binary',
            'Content-Length' => filesize($file . '/' . $file_name),
            'Cache-Control' => 'max-age=0',
            'Cache-Control' => 'max-age=1',
            'Expires' => 'Mon, 26 Jul 1997 05:00:00 GMT',
            'Last-Modified' => gmdate('D, d M Y H:i:s') . ' GMT',
            'Cache-Control' => 'cache, must-revalidate',
            'Pragma' => 'public',
            'Set-Cookie' => 'fileDownload=true; path=/',
            'Access-Control-Expose-Headers' => 'Content-Length,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma'
        ];

        return response()->download($file . '/' . $file_name, $file_name, $headers);
    }

问题

1. const contentDispositionHeader: string = response.headers.get('Content-Disposition'); 似乎总是空的.
2. 我们无法打开下载的文件,显示已损坏的邮件.
3. 它适用于文本文件下载

请帮我解决这个问题.或指定任何其他工作代码//包的角度

Answer 1

试试这个:

downloadExcel() {

  const type = 'application/vnd.ms-excel';
  const filename = 'file.xls';
  const options = new RequestOptions({
            responseType: ResponseContentType.Blob,
            headers: new Headers({ 'Accept': type })
        });

  this.http.get('http://10.2.2.109/Download/exportExcel', options)
           .catch(errorResponse => Observable.throw(errorResponse.json()))
           .map((response) => { 
                 if (response instanceof Response) {
                    return response.blob();
                 }
                 return response;
            })
           .subscribe(data => saveAs(data, filename),
                      error => console.log(error)); // implement your error handling here

}

关键点responseType: ResponseContentType.Blob在RequestOptions和response.blob()获取响应时.

在一般情况下,不建议访问_body这样的响应特性:response._body,而是你应该调用相关的方法基于其类型来获取身体的内容(如response.blob(),response.json()等)