如何在 Angular 4 中下载 excel/Zip 文件 [英] How to download excel/Zip files in Angular 4

问题描述

我使用 angular 4 作为前端，使用 lumen 5.4 作为后端.

I am using angular 4 as frond end and lumen 5.4 as back end.

我的要求是将一些数据导出为 excel 和 zip 文件.

My requirement is to export some data as excel and zip file.

使用 import { saveAs } from 'file-saver/FileSaver'; 包下载文件.

Using import { saveAs } from 'file-saver/FileSaver'; package for file download.

Angular 4 代码:

downloadExcel() {

const type = 'application/vnd.ms-excel';
const headers = { headers: new Headers({ 'Accept': type }) };
const filename = 'file.xls';

this.http.get('http://10.2.2.109/Download/exportExcel', headers)
  .toPromise()
  .then(response => this.saveToFileSystem(response, type, filename));

return false;


}



private saveToFileSystem(response, __type, filename) {
    const contentDispositionHeader: string = response.headers.get('Content-Disposition');

if (contentDispositionHeader !== null) {
  const parts: string[] = contentDispositionHeader.split(';');
  //const filename = parts[1].split('=')[1];
  const blob = new Blob([response._body], { type: __type });
  saveAs(blob, filename);
} else {
  alert('Cant download.....');
  // handling download condition if content disposition is empty
  const blob = new Blob([response._body], { type: __type });
  saveAs(blob, filename);
}


}

流明代码

public function exportExcel(Request $request) {
        $file = storage_path();
        $file_name = 'book1.xls';
        $headers = [
            'Content-type' => 'application/vnd.ms-excel',
            'Content-Disposition' => 'attachment;filename="' . $file_name,
            'X-Filename' => $file_name,
            'Content-Transfer-Encoding' => 'binary',
            'Content-Length' => filesize($file . '/' . $file_name),
            'Cache-Control' => 'max-age=0',
            'Cache-Control' => 'max-age=1',
            'Expires' => 'Mon, 26 Jul 1997 05:00:00 GMT',
            'Last-Modified' => gmdate('D, d M Y H:i:s') . ' GMT',
            'Cache-Control' => 'cache, must-revalidate',
            'Pragma' => 'public',
            'Set-Cookie' => 'fileDownload=true; path=/',
            'Access-Control-Expose-Headers' => 'Content-Length,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma'
        ];

        return response()->download($file . '/' . $file_name, $file_name, $headers);
    }

问题

1. const contentDispositionHeader: string = response.headers.get('Content-Disposition'); 似乎总是空的.
2. 我们无法打开下载的文件，显示已损坏的消息.
3. 它适用于文本文件下载

请帮我解决这个问题.或为 angular 指定任何其他工作代码//包

Please help me to resolve this issue. OR specify any other working code//package for angular

推荐答案

试试这个:

downloadExcel() {

  const type = 'application/vnd.ms-excel';
  const filename = 'file.xls';
  const options = new RequestOptions({
            responseType: ResponseContentType.Blob,
            headers: new Headers({ 'Accept': type })
        });

  this.http.get('http://10.2.2.109/Download/exportExcel', options)
           .catch(errorResponse => Observable.throw(errorResponse.json()))
           .map((response) => { 
                 if (response instanceof Response) {
                    return response.blob();
                 }
                 return response;
            })
           .subscribe(data => saveAs(data, filename),
                      error => console.log(error)); // implement your error handling here

}

关键点是 RequestOptions 上的 responseType: ResponseContentType.Blob 和返回响应时的​​ response.blob().

The key points are responseType: ResponseContentType.Blob on the RequestOptions and response.blob() when getting back the response.

一般来说，不建议像这样访问响应的_body属性:response._body，而是应该调用相关的方法来获取主体基于其类型的内容(如 response.blob()、response.json() 等)

In general, it's not recommended to access the _body property of the response like this: response._body, but instead you should call the relevant method to get the body content based on its type (like response.blob(), response.json(), etc)

这篇关于如何在 Angular 4 中下载 excel/Zip 文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！