使用angular文件保护程序下载大文件

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FileDownloadService {

  constructor(private http: HttpClient) { }

  downloadFile(fileUrl: string): Observable<Blob> {
    return this.http.get(fileUrl, { responseType: 'blob' });
  }
}

import { Component } from '@angular/core';
import { FileDownloadService } from './file-download.service';

@Component({
  selector: 'app-file-download',
  template: `
    <button (click)="downloadFile()">Download File</button>
  `,
})
export class FileDownloadComponent {

  constructor(private fileDownloadService: FileDownloadService) { }

  downloadFile() {
    const fileUrl = 'https://example.com/path/to/file.pdf';
    this.fileDownloadService.downloadFile(fileUrl).subscribe((blob: Blob) => {
      const downloadUrl = URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = downloadUrl;
      link.download = 'file.pdf';
      link.click();
    });
  }
}