使用ResponseBodyAdvice的beforeBodyWrite处理String导致cast问题

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@Configuration
public class GlobalReturnConfig {
    @RestControllerAdvice(basePackages = "com.benyuan")
    static class ResultResponseAdvice implements ResponseBodyAdvice<Object> {
        @Override
        public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
            return true;
        }

        @Override
        public Object beforeBodyWrite(Object body, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
            if (body instanceof ResponseDTO) {
                return body;
            }
            return ResponseDTOUtil.success(body);
        }
    }

}

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/**
 * 使用RestControllerAdvice的beforeBodyWrite方法时，在处理String时，实际处理的HttpMessageConverter，应该是MappingJackson2HttpMessageConverter
 * @Description
 */
@Configuration
public class WebConfiguration implements WebMvcConfigurer {
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        // 0-1可配，2-8是默认加载的
        converters.add(0, new MappingJackson2HttpMessageConverter());
    }
}