@Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        //1、先定義一個convert轉換消息的對象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        //2、添加fastjson的配置信息，比如是否要格式化返回的json數(shù)據(jù)；
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
        //附加：處理中文亂碼
        List<MediaType> fastMedisTypes = new ArrayList<>();
        fastMedisTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMedisTypes);
        //3、在convert中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);
        HttpMessageConverter<?> converter = fastConverter;
        return new HttpMessageConverters(converter);
    }