Angular 6：从后端服务器获取文件对象后下载文件

Question

我有一个 File 对象类型的结构 {type: "Buffer", data: Array(702549)}，我需要在 angular 6 中做什么才能下载此文件浏览器？

我从这个函数得到了我的回应：

  getMarketingProposalById(id: string): Observable<MarketingProposal> {
    return this.httpClient.get<MarketingProposal>(this.apiUrl  + id , this.httpOptions).pipe(map(marketingProposal => {
      if (marketingProposal.materials[0] && marketingProposal.materials[0].file) {
        const blob = new Blob([marketingProposal.materials[0].file.data], { type: 'image/png' });
        console.log(blob);
        // saveAs(blob, 'hello.png');
      }
      const marketingProposalObject = this.assignMarketingProposalObject(marketingProposal);
      this.mapStringToDate(marketingProposalObject);
      return marketingProposalObject;
    }));
  }

marketingProposal.materials[0].file 的格式为 {type: "Buffer", data: Array(702549)}

Answer 1

您可以使用文件保护程序来执行此操作：https://www.npmjs.com/package/file-saver

文件下载代码：

import { saveAs } from 'file-saver';

loadFile(fileId: number) {
   try {
       let isFileSaverSupported = !!new Blob;
   } catch (e) { 
       console.log(e);
       return;
   }

   this.repository.loadFile(fileId).subscribe(response => {
       let blob = new Blob([response.data], { type: 'application/pdf' });
       saveAs(blob, `file${fileId}.pdf`);
   });
}

更新： 我根据负载情况创建了一个测试项目：

http.get('http://localhost:4200/assets/image.png', {responseType: 'blob'}).subscribe(response => {
  try {
      let isFileSaverSupported = !!new Blob;
  } catch (e) { 
      console.log(e);
      return;
  }
  let blob = new Blob([response], { type: 'image/png' });
  saveAs(blob, `file.png`);
});

Angular 6：从后端服务器获取文件对象后下载文件

Angular 6: Download file after getting File object from backend server

angular-universal

angular

angular6