ObjectMapper（Jackson）解析Json对象

 ObjectMapper mapper = new ObjectMapper();
 // 忽略大小写
 mapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
 // 下划线 与 驼峰转化
 mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
 // 未知字段不报错
 mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

否则报错

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field