从angular6向springboot发送一个空的多部分文件

const formData = new FormData();
formData.append('file', new Blob(), 'filename');

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

// ...

constructor(private http: HttpClient) {}

// ...

const url = 'http://your-spring-boot-api-endpoint';
this.http.post(url, formData).subscribe(response => {
  console.log('File uploaded successfully');
}, error => {
  console.error('Error uploading file:', error);
});

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class FileUploadController {

    @PostMapping("/upload")
    public String uploadFile(@RequestParam("file") MultipartFile file) {
        // 处理文件上传逻辑
        if (file.isEmpty()) {
            return "Empty file received";
        } else {
            // 文件不为空，进行处理
            return "File uploaded successfully";
        }
    }
}