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import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import java.io.*;
import java.nio.file.Files;
import java.util.Map;

@RestController
public class JsonController {

    // Your existing code for AWS credentials and S3 bucket/object keys goes here

    @GetMapping("/json")
    @ResponseBody
    public Map<String, Object> getJsonFromS3() {
        AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
                                .withRegion("your-region")
                                .withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY)))
                                .build();

        S3Object s3Object = s3Client.getObject(BUCKET_NAME, OBJECT_KEY);

        File tempFile = null;
        try {
            tempFile = File.createTempFile("temp", ".json");
            try (InputStream inputStream = s3Object.getObjectContent();
                 OutputStream outputStream = new FileOutputStream(tempFile)) {
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
            }
            ObjectMapper objectMapper = new ObjectMapper();
            return objectMapper.readValue(tempFile, new TypeReference<Map<String, Object>>() {});
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (tempFile != null) {
                try {
                    Files.delete(tempFile.toPath());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return null;
    }
}