如何在angular中使用POST上传文件？

import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

constructor(private http: HttpClient) { }

uploadFile(file: File): Observable<any> {
  const formData = new FormData();
  formData.append('file', file);

  return this.http.post('your-upload-url', formData);
}

<input type="file" (change)="onFileSelected($event)">

onFileSelected(event: any) {
  const file: File = event.target.files[0];
  this.uploadFile(file).subscribe(
    response => {
      console.log('File uploaded successfully');
    },
    error => {
      console.error('File upload failed');
    }
  );
}