在浏览器中查看/下载来自node.js后端的pdf

Question

我在我的节点后端生成一个pdf，如下所示：

router.post('/api/submissions/generatecontract', auth, function (req, res, next) {
  if (!req.body.stallholderId || !req.body.edition) {
    return res.json({status: 400, message: 'Please enter all fields.' });
  }

  var doc = new PDFDocument();

  doc.fontSize(25).text('Here is some text', 100, 80);
  doc.end();

  return doc.pipe(res);
});

现在，当我调用后端和控制台时。记录响应，我得到以下输出：

_正文：“%PDF-1.3↵%����↵50 obj↵

标头：标头_headersMap：地图大小：（...）原型：地图[1] 0：{"内容类型"=

我看到我的PDF在回复的正文中。但我现在如何在浏览器中查看或下载它？如果有必要的话，我会在前端使用Angular2。

我找到的信息是以前的angular 2版本。

Answer 1

我是这样解决的：

  generateContract(stallholder: Stallholder, submission: Submission) {
    let headers = new Headers();
    let options = new RequestOptions({ headers: headers });

    headers.append('authorization', 'Bearer ' + this.userService.getToken());

    this.http.get(this.apiUrl + `api/editions/${submission.edition}`, options)
      .map(res => res.json()).subscribe(data => {
        if (data.status === 200) {
          let total = submission.metersStreet * data.price;
          let params = `email=${stallholder.email}&firstName=${stallholder.firstName}&lastName=${stallholder.lastName}
          &name=${stallholder.name}&metersStreet=${submission.metersStreet}&metersDepth=${submission.metersDepth}
          &edition=${submission.edition}&total=${total}`;
          this.openPdfFile(params);
        }
      });
  }

  openPdfFile(params) {
    this.downloadFile(params, function (blob) {
      let win: any = window.open('_blank');
      let blobb = new Blob([blob], {type: 'application/pdf'});
      let url: any = URL.createObjectURL(blobb);
      win.location.href = url;
    });
  }

  downloadFile(params, success) {
    let xhr = new XMLHttpRequest();
    xhr.open('POST', this.apiUrl + 'api/submissions/generatecontract', true);
    xhr.setRequestHeader('authorization', 'Bearer ' + this.userService.getToken());
    xhr.responseType = 'arraybuffer';
    xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    xhr.onreadystatechange = function () {
      if (xhr.readyState === 4) {
        if (success) {
          success(xhr.response);
        }
      }
    };
    xhr.send(params);
  }