解决comalibabafastjsonJSONObject cannot be cast to javalangString-944130d2-c0df-45c3-84a5-e03e201383b6

添加fastJSONconfig

@Configuration
public class fastJsonConfig {

    @Bean
    public HttpMessageConverters converter() {
        FastJsonHttpMessageConverter convert = new FastJsonHttpMessageConverter();
        // 创建ＦastJson 配置对象
        FastJsonConfig config = new FastJsonConfig();
        // 创建ＦastJson格式化　按照格式化输出
        config.setSerializerFeatures(SerializerFeature.PrettyFormat);
        //将配置对象添加到转换器
        convert.setFastJsonConfig(config);
        //处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON);
        convert.setSupportedMediaTypes(fastMediaTypes);
        HttpMessageConverter<?> con = convert;
        return new HttpMessageConverters(con);
    }

}