如何在spring应用程序中从web服务下载image / pdf文件

@RestController
public class FileDownloadController {

    @GetMapping("/download/image")
    public ResponseEntity<byte[]> downloadImage() throws IOException {
        // Load image file
        ClassPathResource resource = new ClassPathResource("image.jpg");
        byte[] imageBytes = Files.readAllBytes(resource.getFile().toPath());

        // Set response headers
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.IMAGE_JPEG);
        headers.setContentDisposition(ContentDisposition.builder("attachment").filename("image.jpg").build());

        // Return ResponseEntity
        return ResponseEntity.ok().headers(headers).body(imageBytes);
    }

    @GetMapping("/download/pdf")
    public ResponseEntity<byte[]> downloadPdf() throws IOException {
        // Load PDF file
        ClassPathResource resource = new ClassPathResource("document.pdf");
        byte[] pdfBytes = Files.readAllBytes(resource.getFile().toPath());

        // Set response headers
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_PDF);
        headers.setContentDisposition(ContentDisposition.builder("attachment").filename("document.pdf").build());

        // Return ResponseEntity
        return ResponseEntity.ok().headers(headers).body(pdfBytes);
    }
}