如何下载我的服务器（springboot）上生成的pdf格式文件？

正如@JBNizet所建议的那样，我实现了以下可观察对象：

零件：

getPDF(){      this.apiService.getPDF(this.invoiceId)      .subscribe(        (data: Blob) => {          var file = new Blob([data], { type: 'application/pdf' })          var fileURL = URL.createObjectURL(file);// if you want to open PDF in new tab          window.open(fileURL);var a         = document.createElement('a');          a.href        = fileURL;a.target      = '_blank';          a.download    = 'bill.pdf';          document.body.appendChild(a);          a.click();        },        (error) => {          console.log('getPDF error: ',error);        }      );    }

服务：

getPDF(invoiceId : number): Observable<Blob>     {         this.url = this.main_url + '/invoices/generatepdf/'+invoiceId;         var authorization = 'Bearer '+sessionStorage.getItem("access_token");         const headers = new HttpHeaders({ 'Content-Type': 'application/json',         "Authorization": authorization, responseType : 'blob'});         return this.httpClient.get<Blob>(this.url, { headers : headers,responseType :          'blob' as 'json'});     }

我引用的网址：

1. 重载＃2：https：//angular.io/api/common/http/HttpClient#get
2. 使用Http Post预览Blob：https： //dzone.com/articles/how-to-preview-blobs-with-http-post-and-angular-5