如何在angular 7下载PDF？

Question

    getRevenueReport() {

        const revenueReport = {
              dateFrom: '1/04/2019',
              dateTo: '23/04/2019',
       };

        this.apiService.getRevenueReport(revenueReport).subscribe( response => {
              console.log('response: ', response);
              const mediaType = 'application/pdf';

              const blob = new Blob(response, { type: mediaType });

              saveAs(blob, 'revenue.pdf');

            }, error => {
              console.log('error: ', error);
            });
    }

    getRevenueReport(revenueReport): any {
        const options = {
          headers: new HttpHeaders({
            'Content-Type': 'application/json',
            Accept: '*/*',
            Authorization: 'apiKey 8989jjjhjhgghghg765756',
          })
        };
        return this.http.post(this.BASE_API_URL + '/api/report', revenueReport, options);
      }

Error：SyntaxError：在JSON中，在XMLHttpRequest.onload Oketask(http://localhost:4200/polyfills.js:2780:60)在zone.push../node_modules/zone.js/dist/zone.js.zone.runtask(http://localhost:4200/polyfills.js:2553:47)在zonetask.push../node_modules/zone.js/dist/zone.js.zonetask.js.zonetask.invokeTask[as ZoneAwaRecallBack（http://localhost:4200/polyfills.js:4139:21）消息：“JSON at position 0中的意外令牌%”Stack：“SyntaxError：JSON at position 0中的意外令牌%在XMLHttpRequest.on在zoneDelegate.push../node_modules/zone.js/dist/zone.js.zoneDelegate.invokeTask(http://localhost:4200/polyfills.js:2781:31)在object.oninvoketask(http://localhost:4200/vendor.js:59081:33)在zoneDelegate.push../node_modules/zone.js/dist/zone.zoneDelegate.invokeTask one.push../node_modules/zone.js/dist/zone.js.zone.runtask(http://localhost:4200/polyfills.js:2553:47)在zonetask.push../node_modules/zone.js/dist/zone.js.zonetask.invokeTask[as invoke](http://localhost:4200/polyfills.js:2856:34)在invokeTask(http://localhost:4200/polyfills.js:4102:14)在9:21）“Proto：错误文本：”%PDF-1.5%3 0 obj<

Answer 1

重要-在请求头中，将响应类型添加到'ArrayBuffer'中作为'JSON'，否则它将不起作用

fetchPDF(url: string,data): Observable<any> {
this.getCredentials();
const authHeaders = this.createBasicAuthorizationHeader(this.credentials);
 return this.http.post(this.getApiUrl(url),data,{headers: authHeaders,'responseType'  : 'arraybuffer' as 'json'})
 }



exportPDF(){
this.httpRestClient.fetchPDF("download_salary_report", revenueReport ).subscribe(
  response => {
    var blob = new Blob([response], {type: 'application/pdf'});
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf('MSIE');
    var trident = ua.indexOf('Trident/');
    var edge = ua.indexOf('Edge/');

  if(msie > 0 || trident > 0 || edge > 0){
    window.navigator.msSaveOrOpenBlob(blob,'revenue.pdf');
}
else if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
    var link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = "revenue.pdf";
    document.body.appendChild(link);
    link.click();

    window.setTimeout(function() {
      URL.revokeObjectURL(link.href);
      document.body.removeChild(link);
    }, 0);

}
  else{ 

  var link=document.createElement('a');
  link.href=window.URL.createObjectURL(blob);
  link.download="revenue.pdf";
  link.click();


  }

    },
  error=>{
  // show your error message here

  });


 }

或者您可以像这样使用get请求。

 window.open(appConfig.DOMAIN_NAME+"export_report_item_consumption/"+(itemName+ "," +this.datepipe.transform(this.payloadBean.fromDate, 'yyyy-MM-dd')
   + "," +this.datepipe.transform(this.payloadBean.toDate, 'yyyy-MM-dd')+","+this.currentuser.userID).toString(),'_blank' , "");

只需在URL后面追加变量即可。