我今天也遇到了同样的情况，我不得不下载一个pdf文件作为附件(该文件不应该在浏览器中呈现，而是下载)。为了达到这个目的，我发现我必须在Angular Blob中获取文件，同时在响应中添加一个Content-Disposition头。

这是我能得到的最简单的(Angular 7):

服务内部:

getFile(id: String): Observable<HttpResponse<Blob>> {
  return this.http.get(`./file/${id}`, {responseType: 'blob', observe: 'response'});
}

然后，当我需要下载组件中的文件时，我可以简单地:

fileService.getFile('123').subscribe((file: HttpResponse<Blob>) => window.location.href = file.url);

更新:

从服务中删除不必要的报头设置

这是为那些寻找如何使用HttpClient和文件保存器的人准备的:

点击安装

NPM安装文件保护程序 NPM install @types/file-saver

API服务类:

export() {
    return this.http.get(this.download_endpoint, 
        {responseType: 'blob'});
}

组件:

import { saveAs } from 'file-saver';
exportPdf() {
    this.api_service.export().subscribe(data => saveAs(data, `pdf report.pdf`));
}

 let headers = new Headers({
                'Content-Type': 'application/json',
                'MyApp-Application': 'AppName',
                'Accept': 'application/vnd.ms-excel'
            });
            let options = new RequestOptions({
                headers: headers,
                responseType: ResponseContentType.Blob
            });


this.http.post(this.urlName + '/services/exportNewUpc', localStorageValue, options)
                .subscribe(data => {
                    if (navigator.appVersion.toString().indexOf('.NET') > 0)
                    window.navigator.msSaveBlob(data.blob(), "Export_NewUPC-Items_" + this.selectedcategory + "_" + this.retailname +"_Report_"+this.myDate+".xlsx");

                    else {
                        var a = document.createElement("a");
                        a.href = URL.createObjectURL(data.blob());
                        a.download = "Export_NewUPC-Items_" + this.selectedcategory + "_" + this.retailname +"_Report_"+this.myDate+ ".xlsx";
                        a.click();
                    }
                    this.ui_loader = false;
                    this.selectedexport = 0;
                }, error => {
                    console.log(error.json());
                    this.ui_loader = false;
                    document.getElementById("exceptionerror").click();
                });

对于那些使用Redux模式

我在文件保存器中添加了@Hector Cuevas的名字，在他的回答中。使用Angular2 v. 2.3.1，我不需要添加@types/file-saver。

以PDF格式下载日志为例。

日记账操作

public static DOWNLOAD_JOURNALS = '[Journals] Download as PDF';
public downloadJournals(referenceId: string): Action {
 return {
   type: JournalActions.DOWNLOAD_JOURNALS,
   payload: { referenceId: referenceId }
 };
}

public static DOWNLOAD_JOURNALS_SUCCESS = '[Journals] Download as PDF Success';
public downloadJournalsSuccess(blob: Blob): Action {
 return {
   type: JournalActions.DOWNLOAD_JOURNALS_SUCCESS,
   payload: { blob: blob }
 };
}

期刊效应

@Effect() download$ = this.actions$
    .ofType(JournalActions.DOWNLOAD_JOURNALS)
    .switchMap(({payload}) =>
        this._journalApiService.downloadJournal(payload.referenceId)
        .map((blob) => this._actions.downloadJournalsSuccess(blob))
        .catch((err) => handleError(err, this._actions.downloadJournalsFail(err)))
    );

@Effect() downloadJournalSuccess$ = this.actions$
    .ofType(JournalActions.DOWNLOAD_JOURNALS_SUCCESS)
    .map(({payload}) => saveBlobAs(payload.blob, 'journal.pdf'))

期刊服务

public downloadJournal(referenceId: string): Observable<any> {
    const url = `${this._config.momentumApi}/api/journals/${referenceId}/download`;
    return this._http.getBlob(url);
}

HTTP服务

public getBlob = (url: string): Observable<any> => {
    return this.request({
        method: RequestMethod.Get,
        url: url,
        responseType: ResponseContentType.Blob
    });
};

轴颈减速器 虽然这只设置了我们应用程序中使用的正确状态，但我仍然想添加它来显示完整的模式。

case JournalActions.DOWNLOAD_JOURNALS: {
  return Object.assign({}, state, <IJournalState>{ downloading: true, hasValidationErrors: false, errors: [] });
}

case JournalActions.DOWNLOAD_JOURNALS_SUCCESS: {
  return Object.assign({}, state, <IJournalState>{ downloading: false, hasValidationErrors: false, errors: [] });
}

我希望这对你有帮助。

如果你不需要在请求中添加头文件，在Angular2中下载一个文件，你可以做一个简单的(KISS原则):

window.location.href='http://example.com/myuri/report?param=x';

在你的组件中。

如果您尝试在订阅内部调用新方法，效果会更好

this._reportService.getReport()
    .subscribe((data: any) => {
        this.downloadFile(data);
    },
        (error: any) => сonsole.log(error),
        () => console.log('Complete')
    );

在downloadFile(data)函数中，我们需要创建block, link, href和文件名

downloadFile(data: any, type: number, name: string) {
    const blob = new Blob([data], {type: 'text/csv'});
    const dataURL = window.URL.createObjectURL(blob);

    // IE doesn't allow using a blob object directly as link href
    // instead it is necessary to use msSaveOrOpenBlob
    if (window.navigator && window.navigator.msSaveOrOpenBlob) {
      window.navigator.msSaveOrOpenBlob(blob);
      return;
    }

    const link = document.createElement('a');
    link.href = dataURL;
    link.download = 'export file.csv';
    link.click();

    setTimeout(() => {

      // For Firefox it is necessary to delay revoking the ObjectURL
      window.URL.revokeObjectURL(dataURL);
      }, 100);
    }
}