Typescript Angular：如何从 HttpClient 下载文件

发布于08月04日

我需要从后端下载一个excel，它返回了一个文件.

当我执行请求时，我会收到错误:

TypeError:您在需要流的地方提供了"undefined".你

我的代码是:

this.http.get(`${environment.apiUrl}/...`)
      .subscribe(response => this.downloadFile(response, "application/ms-excel"));

我试着找到 map (…)但没用.

详情:angular 5.2

参考资料:

import { HttpClient } from '@angular/common/http';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/finally';
import 'rxjs/add/operator/map'
import 'rxjs/add/operator/catch';

响应的内容类型:

Content-Type: application/ms-excel

发生了什么？

推荐答案

试试这样:

类型:应用程序/ms excel

/**
 *  used to get file from server
 */

this.http.get(`${environment.apiUrl}`,{
          responseType: 'arraybuffer',headers:headers} 
         ).subscribe(response => this.downLoadFile(response, "application/ms-excel"));


    /**
     * Method is use to download file.
     * @param data - Array Buffer data
     * @param type - type of the document.
     */
    downLoadFile(data: any, type: string) {
        let blob = new Blob([data], { type: type});
        let url = window.URL.createObjectURL(blob);
        let pwa = window.open(url);
        if (!pwa || pwa.closed || typeof pwa.closed == 'undefined') {
            alert( 'Please disable your Pop-up blocker and try again.');
        }
    }