angular 2中的zip文件上传问题

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-file-upload',
  template: `
    <input type="file" (change)="onFileSelected($event.target.files)">
    <button (click)="upload()">上传</button>
  `
})
export class FileUploadComponent {
  selectedFile: File;

  constructor(private http: HttpClient) {}

  onFileSelected(files: FileList) {
    this.selectedFile = files.item(0);
  }

  upload() {
    const formData = new FormData();
    formData.append('file', this.selectedFile);

    this.http.post('/upload', formData).subscribe(
      response => {
        console.log('上传成功');
      },
      error => {
        console.error('上传失败');
      }
    );
  }
}