1.添加了@EnableWebMvc，需要手动添加相关配置，swagger页面问题，出现Unable to render this definition The provided definition does not specify a valid version field. Please indicate a valid Swagger or OpenAPI version field. Supported version fields are swagger: "2.0" and those that match openapi: 3.0.n (for example, openapi: 3.0.0)需要先确保：

        //下面的转换器添加顺序不能乱        
        converters.add(new ByteArrayHttpMessageConverter());
        converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
        converters.add(new StringHttpMessageConverter());

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        //处理包装类型
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        // 处理基本类型long（非包装类）
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);

        objectMapper.registerModule(simpleModule);
        // 设置时区为 GMT+8
        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        // 启用循环引用处理
        objectMapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
        // 忽略类中不存在的字段
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        //下面的转换器添加顺序不能乱        
        converters.add(new ByteArrayHttpMessageConverter());
        converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
        converters.add(new StringHttpMessageConverter());

    
    }