如何使用angular 7将文件上传到spring boot？

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

constructor(private http: HttpClient) {}

uploadFile(event) {
  const file = event.target.files[0];
  const formData = new FormData();
  formData.append('file', file);
  
  // 发送HTTP POST请求
  this.http.post('http://your-spring-boot-api/upload', formData).subscribe(
    response => {
      console.log('File uploaded successfully');
    },
    error => {
      console.error('Error uploading file');
    }
  );
}

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

@RestController
public class FileUploadController {
  
  @PostMapping("/upload")
  public ResponseEntity<String> uploadFile(@RequestPart("file") MultipartFile file) {
    // 处理文件上传逻辑
    // ...
    
    return ResponseEntity.ok("File uploaded successfully");
  }
}