Angular:如何从 HttpClient 下载文件?

问题描述

我需要从我的后端下载一个 excel，它返回了一个文件.

I need download an excel from my backend, its returned a file.

当我执行请求时出现错误:

When I do the request I get the error:

TypeError:您在需要流的地方提供了未定义".你可以提供 Observable、Promise、Array 或 Iterable.

我的代码是:

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

我尝试过 get 和 map(...) 但没有奏效.

I tried get and map(...) but didn't work.

详细信息:angular 5.2

参考:

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

怎么了?

推荐答案

试试这个:

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.');
        }
    }

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