我有一个WebApi / MVC应用程序，我正在为它开发一个angular2客户端(以取代MVC)。我在理解Angular如何保存文件时遇到了一些麻烦。
请求是可以的(与MVC一起工作很好，我们可以记录接收到的数据)，但我不知道如何保存下载的数据(我主要遵循与本文相同的逻辑)。我确信这是愚蠢的简单，但到目前为止，我根本没有领会它。
组件函数的代码如下。我尝试了不同的替代方案，blob方式应该是我所理解的方式，但URL中没有createObjectURL函数。我甚至不能在窗口中找到URL的定义，但显然它存在。如果我使用FileSaver.js模块，我得到同样的错误。所以我猜这是最近改变的或者还没有实现的东西。我如何触发文件保存在A2?
downloadfile(type: string){
let thefile = {};
this.pservice.downloadfile(this.rundata.name, type)
.subscribe(data => thefile = new Blob([data], { type: "application/octet-stream" }), //console.log(data),
error => console.log("Error downloading the file."),
() => console.log('Completed file download.'));
let url = window.URL.createObjectURL(thefile);
window.open(url);
}
为了完整起见，获取数据的服务如下所示，但它所做的唯一一件事是发出请求并在没有映射的情况下传递数据:
downloadfile(runname: string, type: string){
return this.authHttp.get( this.files_api + this.title +"/"+ runname + "/?file="+ type)
.catch(this.logAndPassOn);
}
我分享了帮助我的解决方案(任何改进都非常感谢)
关于你的服务“pservice”:
getMyFileFromBackend(typeName: string): Observable<any>{
let param = new URLSearchParams();
param.set('type', typeName);
// setting 'responseType: 2' tells angular that you are loading an arraybuffer
return this.http.get(http://MYSITE/API/FILEIMPORT, {search: params, responseType: 2})
.map(res => res.text())
.catch((error:any) => Observable.throw(error || 'Server error'));
}
组成部分:
downloadfile(type: string){
this.pservice.getMyFileFromBackend(typename).subscribe(
res => this.extractData(res),
(error:any) => Observable.throw(error || 'Server error')
);
}
extractData(res: string){
// transforme response to blob
let myBlob: Blob = new Blob([res], {type: 'application/vnd.oasis.opendocument.spreadsheet'}); // replace the type by whatever type is your response
var fileURL = URL.createObjectURL(myBlob);
// Cross your fingers at this point and pray whatever you're used to pray
window.open(fileURL);
}
在组件部分，无需订阅响应即可调用服务。订阅
有关openOffice mime类型的完整列表，请参见:http://www.openoffice.org/framework/documentation/mimetypes/mimetypes.html
这是我在我的案例中做的事情
// service method
downloadFiles(vendorName, fileName) {
return this.http.get(this.appconstants.filesDownloadUrl, { params: { vendorName: vendorName, fileName: fileName }, responseType: 'arraybuffer' }).map((res: ArrayBuffer) => { return res; })
.catch((error: any) => _throw('Server error: ' + error));
}
// a controller function which actually downloads the file
saveData(data, fileName) {
var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
let blob = new Blob([data], { type: "octet/stream" }),
url = window.URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
window.URL.revokeObjectURL(url);
}
// a controller function to be called on requesting a download
downloadFiles() {
this.service.downloadFiles(this.vendorName, this.fileName).subscribe(data => this.saveData(data, this.fileName), error => console.log("Error downloading the file."),
() => console.info("OK"));
}
解决方案从这里引用
