如何在Spring web flux的Mono / Flux中添加自定义响应？

public class CustomResponse {
    private String message;
    private int statusCode;
    private Object data;

    // 构造函数、getter和setter方法
}

@GetMapping("/custom-response")
public Mono<CustomResponse> getCustomResponse() {
    CustomResponse response = new CustomResponse();
    response.setMessage("Custom response message");
    response.setStatusCode(200);
    response.setData("Custom data");

    return Mono.just(response);
}

@GetMapping("/custom-response")
@ResponseStatus(HttpStatus.OK)
public Mono<CustomResponse> getCustomResponse() {
    // ...
}

@GetMapping("/error-response")
public Mono<CustomResponse> getErrorResponse() {
    return Mono.error(new RuntimeException("Error occurred"));
}