[英]File upload in Angular2 not working
我正在尝试创建文件上传功能,用户可以在其中上传geotiff(大小可能为数GB)。 由于某种原因,我的角度代码无法击中api并抛出404,但是我可以使用Postman上传文件。
角度代码:
fileChange(event) {
let token = localStorage.getItem('userToken');
let fileList: FileList = event.target.files;
if (fileList.length > 0) {
let file: File = fileList[0];
let formData: FormData = new FormData();
formData.append('files', file, file.name);
let headers = new Headers();
headers.append('Content-Type', 'multipart/form-data');
headers.append("Authorization", token);
let options = new RequestOptions({ headers: headers });
this.uploadInProgress = true;
this._http.post(`${this.uploadApiUrl}`, formData, options)
.map(res => res.json())
.catch(error => Observable.throw(error))
.subscribe(
data => console.log('success'),
error => console.log(error),
() => this.uploadInProgress = false)
}
}
API:
// POST: api/GeoTif
[HttpPost]
public async Task<IActionResult> Post(List<IFormFile> files)
{
long size = files.Sum(f => f.Length);
return Ok(new { NoOfUploadedFileCount = files.Count, TotalFileSize =size });
}
我了解HTTP服务和FormData存在问题。您可以使用XMLHttpRequest来完成它:
fileChange(event: Event) {
this.uploadFile(event)
.subscribe(() => {
console.log('sent');
})
}
private uploadFile(event: Event) {
return Observable.create(observer => {
const token = localStorage.getItem('userToken');
const fileList = event.target.files;
if (fileList.length > 0) {
const file = fileList[0];
const formData = new FormData();
const xhr = new XMLHttpRequest();
formData.append('files', file, file.name);
this.uploadInProgress = true;
xhr.onreadystatechange = () => {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
observer.next(JSON.parse(xhr.response));
observer.complete();
} else {
observer.error(xhr.response);
}
this.uploadInProgress = false;
}
}
xhr.open('POST', this.uploadApiUrl, true);
xhr.send(formData);
}
});
}
添加带有http://
URL(例如: http://localhost/api/GeoTif/
)。 并删除以下代码。
headers.append('Content-Type', 'multipart/form-data');
headers.append("Authorization", token);
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