如何在spring应用程序中从web服务下载image / pdf文件

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileDownloadService {

    private final RestTemplate restTemplate = new RestTemplate();

    public void downloadFile(String url, String destination) throws IOException {
        HttpHeaders headers = new HttpHeaders();
        HttpEntity<String> entity = new HttpEntity<>(headers);

        ResponseEntity<byte[]> response = restTemplate.exchange(url, HttpMethod.GET, entity, byte[].class);

        if (response.getStatusCode().is2xxSuccessful()) {
            try (InputStream inputStream = new ByteArrayInputStream(response.getBody());
                 OutputStream outputStream = new FileOutputStream(destination)) {
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
            }
        } else {
            throw new IOException("Failed to download file: " + response.getStatusCode());
        }
    }
}