在Angular 5中通过Blob下载时设置文件名

Question

以下是我的Typescript代码，可从API下载文件

DownloadLM() {
var ID= sessionStorage.getItem("UserID");
    return this.http.get(this.baseurl + 'api/DownloadFiles/DownloadLM/' + ID,
      {
        headers: {
          'Content-Type': 'application/json'
        },
        responseType: 'arraybuffer'
      }
    )
      .subscribe(respData => {
        this.downLoad(respData, this.type);
      }, error => {
      });
  }

  downLoad(data: any, type: string) {
    var blob = new Blob([data], { type: type.toString() });
    var url = window.URL.createObjectURL(blob);
    var pwa = window.open(url);
    if (!pwa || pwa.closed || typeof pwa.closed == 'undefined') {
      alert('Please disable your Pop-up blocker and try again.');
    }
  }

下载Excel文件很好，但是它给我不需要的文件一个随机的名字，我要在下载时设置自己选择的文件名，

在哪里可以设置文件名？Blob的任何属性？

Answer 1

您可以将download属性设置为所需的文件名，将href设置为对象url，然后调用

var blob = new Blob([data], { type: type.toString() });
var url = window.URL.createObjectURL(blob);
var anchor = document.createElement("a");
anchor.download = "myfile.txt";
anchor.href = blobURL;
anchor.click();

Answer 2

如果您想要上传文件的确切文件名，请从支持的API流中设置文件名的自定义标头。

您可以像这样使用它：我的Excel API响应标头：

content-disposition: inline;filename="salesReport.xls" 
content-type: application/octet-stream 
date: Wed, 22 Aug 2018 06:47:28 GMT 
expires: 0 
file-name: salesReport.xls 
pragma: no-cache 
transfer-encoding: chunked 
x-application-context: application:8080 
x-content-type-options: nosniff 
x-xss-protection: 1; mode=block

服务

content-disposition: inline;filename="salesReport.xls" 
content-type: application/octet-stream 
date: Wed, 22 Aug 2018 06:47:28 GMT 
expires: 0 
file-name: salesReport.xls 
pragma: no-cache 
transfer-encoding: chunked 
x-application-context: application:8080 
x-content-type-options: nosniff 
x-xss-protection: 1; mode=block

Component.ts

excel(data: any) {
  return this.httpClient.post(this.config.domain + 
  `/api/registration/excel/download`,data, {observe: 'response', responseType: 'blob'})
  .map((res) => {
      let data = {
                     image: new Blob([res.body], {type: res.headers.get('Content-Type')}),
                     filename: res.headers.get('File-Name')
                  }
    return data ;
  }).catch((err) => {
    return Observable.throw(err);
  });
}