从Angular和Spring MVC API下载文件

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

export class FileDownloadService {
  constructor(private http: HttpClient) {}

  downloadFile(url: string): void {
    this.http.get(url, { responseType: 'blob' }).subscribe((response: Blob) => {
      const downloadUrl = window.URL.createObjectURL(response);
      const link = document.createElement('a');
      link.href = downloadUrl;
      link.download = 'filename.ext';
      link.click();
      window.URL.revokeObjectURL(downloadUrl);
    });
  }
}

import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FileDownloadController {
  @GetMapping("/download/{filename}")
  public ResponseEntity<Resource> downloadFile(@PathVariable String filename) {
    // 从文件系统或其他位置获取文件资源
    Resource fileResource = ...;

    return ResponseEntity.ok()
        .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + filename + "\"")
        .contentType(MediaType.APPLICATION_OCTET_STREAM)
        .body(fileResource);
  }
}