Angular2 显示 PDF

Angular2 Displaying PDF

我有一个带有 ASP.Net Web API 的 angular2 项目。我有代码从我的数据库中检索文件路径,该文件路径转到我服务器上的文档。然后我想在浏览器的新选项卡中显示此文档。有人对如何执行此操作有任何建议吗?

我很高兴在 Angular2 (Typescript) 或我的 API 中检索文件并将其流式传输。

这是我在 API 中检索它的尝试,但我不知道如何在 Angular2 中接收它并正确显示它:

public HttpResponseMessage GetSOP(string partnum, string description)
    {
        var sopPath = _uow.EpicorService.GetSOP(partnum, description).Path;
        HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
        var stream = new FileStream(sopPath, FileMode.Open);
        result.Content = new StreamContent(stream);
        result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
        return result;
    }

如有任何帮助,我们将不胜感激。

非常感谢!!!

首先,您需要为您的 http 请求设置选项 - 将 responseType 设置为 ResponseContentType.Blob,使用 blob() 将响应读取为 blob 并设置其输入 application/pdf:

downloadPDF(): any {
    return this._http.get(url, { responseType: ResponseContentType.Blob }).map(
    (res) => {
            return new Blob([res.blob()], { type: 'application/pdf' })
        }
}

然后,为了获取文件,您需要 subscribe 它,您可以创建新的 ObjectURL 并使用 window.open() 在新选项卡中打开 PDF:

this.myService.downloadPDF().subscribe(
        (res) => {
        var fileURL = URL.createObjectURL(res);
        window.open(fileURL);
        }
    );

Angular v.5.2.1 答案:

*.services.ts

downloadPDF(): any {
    return this._httpClient.get(url, { responseType: 'blob'})
            .map(res => {
            return new Blob([res], { type: 'application/pdf', });
        });
  }

然后在*.component.ts

downloadPDF() {
    let tab = window.open();
    this._getPdfService
      .downloadPDF()
      .subscribe(data => {
        const fileUrl = URL.createObjectURL(data);
        tab.location.href = fileUrl;
      });
  }

在 调用服务之前 启动并打开一个新选项卡很重要。然后将此选项卡 url 设置为文件 url.

ANGULAR 5

我遇到了同样的问题,我为此浪费了几天时间。

这里我的回答可能对其他人有帮助,这有助于呈现pdf。

对我来说,即使我提到 responseType : 'arraybuffer',它也无法接受。

为此你需要提到 as responseType : 'arraybuffer' as 'json'.(Reference)

工作代码

service.ts

downloadPDF(): any {
return this._httpClient.get(url, { responseType: 'blob' as 'json' })
        .map(res => {
        return new Blob([res], { type: 'application/pdf', });
    });

}

component.ts

this.myService.downloadPDF().subscribe(
    (res) => {
    var fileURL = URL.createObjectURL(res);
    window.open(fileURL);
    }
);

参考以下link

https://github.com/angular/angular/issues/18586

Angular 2+ 示例 PDF 查看器

Page.html

<div class="container">
<div>
    <label>PDF src</label>
    <input type="text" placeholder="PDF src" [(ngModel)]="pdfSrc">
</div>
<div>
    <label>Page:</label>
    <input type="number" placeholder="Page" [(ngModel)]="page">
</div>
<div class="row">
    <div class="col-md-5">
        <div class="thumbnail" style="width: 150px;height: 200px;" (click)="pdfShow=!pdfShow">
            <p>click me to view PDF in Iframe!</p>
            <pdf-viewer [src]="pdfSrc"
                        [page]="page"
                        [original-size]="false"
                        style="display: block;"
             ></pdf-viewer>
        </div>
        <br>
    </div>
    <div class="col-md-7">
        <div *ngIf="!pdfShow">
            <h4>PDF in Iframe</h4>
            <iframe width="500" height="600" [src]="pageurl" type="application/pdf"></iframe>
        </div>
    </div>
</div>
<br><br>
<h2> PDF in Object Tag</h2>
<object width="500" height="600"  data="https://vadimdez.github.io/ng2-pdf-viewer/pdf-test.pdf" type="application/pdf"></object>

page.ts

import { Component } from '@angular/core';
import { BrowserModule, DomSanitizer, SafeResourceUrl } from '@angular/platform- 
browser'

@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
 })
 export class AppComponent {

  pdfSrc = 'https://vadimdez.github.io/ng2-pdf-viewer/pdf-test.pdf';
  page: number = 1;
  pageurl: SafeResourceUrl;

  constructor(private domSanitizer: DomSanitizer) {
     }
      ngOnInit() {
      this.pageurl = this.domSanitizer.bypassSecurityTrustResourceUrl(this.pdfSrc);
     }
     title = 'Mohsen';
     }

app.module.ts

添加

import { FormsModule } from '@angular/forms'; 
import { PdfViewerComponent } from 'ng2-pdf-viewer';
import { HttpModule } from '@angular/http';.
import {HttpClientModule} from '@angular/common/http';
import { BrowserModule } from '@angular/platform-browser';

导入

imports: [
    BrowserModule,
    HttpClientModule,
    HttpModule,
    FormsModule,
    RouterModule.forRoot(appRoutes)
],