post请求（下载文件）

environment.ts:

export const environment = {
  production: false,
  envName: 'dev',
  baseURL: 'http://xxxxxxxxxxxxxx/',
  baseURL1: 'http://xxxxxxxxxxxxxxxxxxx/',
  loginURL: 'http://xxxxxxxxxxxxxxxxxxxx/'
};

API.ts:

export: environment.baseURL1+'manage/export',

 

data.service.ts:

getExportpage(params): Observable<any> {
return this.http.Post(API.exportpage, params, 0, {
msg: '报表导出列表',
data: {}
}).pipe(map(res => res.data));
}

http.service.ts:

  /**
   * 请求主体可以为 urlencoding、JSON、FormData 的 POST 请求
   * @param _url|string 请求地址
   * @param _params|ParamsType 参数对象
   * @param contentType|ContentType Post请求body编码格式
   * @param safeResponse|HttpResponseType 请求错误时的返回值
   * @param userNotification|boolean 是否显示操作提示弹框
   * @param errorSource|string 引起错误的操作来源
   */
  Post(_url: string, _params: ParamsType, contentType: PostContentType, safeResponse: HttpResponseType,
       userNotification: boolean = false, errorSource: string = ''): Observable<HttpResponseType> {
    const URL = this.URLPattern.test(_url) ? _url : environment.baseURL + _url;
    const contentTypeArray = [new HttpParams({fromObject: _params}), _params, this.toFormData(_params)];
    let messageID = '';
    // if (userNotification) {
    //   messageID = this.message.loading('添加中...', { nzDuration: 0 }).messageId;
    // }
    return this.httpClient.post(URL, contentTypeArray[contentType], {

    }).pipe(
      map((response: HttpResponseType) => {
        return this.responseHandler(response, messageID);
        }),
      catchError(this.handleError(safeResponse, errorSource, messageID))
    );
  }



  /**
   * Post 请求参数处理成 FormData 函数
   * @param _params|any
   */
  private toFormData(_params: any): FormData {
    if (!_params) {
      return new FormData();
    }
    if (_params.constructor === FormData) {
      return _params;
    }
    const formData = new FormData();
    for (const key in _params) {
      if (_params.hasOwnProperty(key)) {
        formData.append(key, _params[key]);
      }
    }
    return formData;
  }


  /**
   * 请求成功情况处理
   * @param response|HttpResponseType
   * @param messageID|string
   */
  private responseHandler(response: HttpResponseType, messageID: string): HttpResponseType {
    // this.message.remove(messageID);
    // this.message.success(response.msg);
    return response;
  }

xx.component.ts:

  /**
 * Post下载
 */
  dwReport() {
    this.dataService.getExport({
      end: this.end,
      granularity: this.type,
      platform: this.platform,
      start: this.start
    }).subscribe(data => {
      let url = window.URL.createObjectURL(data);
      let link = document.createElement('a');
      link.style.display = 'none';
      link.href = url;
      link.download = this.platform + '报表.xls'; // docNumber 动态文件名
      document.body.appendChild(link);
      link.click();
    });
  }

xx.component.html:

     <div class="tit_download">
            <a (click)="dwReport()">
               点击下载
            </a>
        </div>