In Spring boot, what is the process for combining file and json responses into a single object?

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One way to combine file and JSON responses is to create a custom object class that contains properties for the desired file and JSON data. Then, in a Spring MVC controller method, use the appropriate classes and methods to generate the desired file and JSON data, and assign them to the respective properties of the custom object. Finally, return the custom object as the response entity. Here's an example:

@GetMapping("/combined-data")
public ResponseEntity<CustomObject> getCombinedData() {

    // Generate file data
    Resource fileResource = new ClassPathResource("file.txt");
    InputStream fileStream = fileResource.getInputStream();
    byte[] fileBytes = fileStream.readAllBytes();

    // Generate JSON data
    JsonObject jsonObject = new JsonObject();
    jsonObject.addProperty("key1", "value1");
    jsonObject.addProperty("key2", "value2");
    String jsonStr = jsonObject.toString();

    // Create custom object
    CustomObject customObject = new CustomObject();
    customObject.setFileData(fileBytes);
    customObject.setJsonData(jsonStr);

    // Return response entity
    return ResponseEntity.ok(customObject);
}

public class CustomObject {
    private byte[] fileData;
    private String jsonData;

    // getters and setters
}