spring boot 空字符串序列化为枚举类，报错解决

配置单独的ObjectMapper，加上属性就可以了，代码如下

    @Bean
    @Primary
    public ObjectMapper objectMapper(){
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);
        objectMapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL,true);
        objectMapper.setDateFormat(dateConverter);
        return objectMapper;
    }

重点就是：READ_UNKNOWN_ENUM_VALUES_AS_NULL：true