从Angular上的路径获取文件或如何以编程方式发布MultiPart文件请求

import { HttpClient, HttpHeaders } from '@angular/common/http';

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

  const headers = new HttpHeaders();
  headers.append('Content-Type', 'multipart/form-data');

  return this.http.post('YOUR_UPLOAD_URL', formData, { headers });
}

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

onFileSelected(files: FileList) {
  const file = files.item(0);
  this.uploadFile(file).subscribe(response => {
    // 处理上传成功后的响应
  }, error => {
    // 处理上传失败的错误
  });
}