JSON Name Strategy

json jackson gson

UnderScore or CamelCase

• Json String could be underscore(access_token) or camel(accessToken) form

• Mapping Json to Model(noramlly camelCase), need to specify Name Strategy if json property in a underscore format, otherwise will lost value(null)

  Jackson

• default mapping by name

• for signle property, use annotation

   @JsonProperty(value = "access_token")
   private String accessToken;

• for globe setting, set ObejctMapper.PropertyNamingStrategy

   objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);

• in practice, create a util class to custom jackson objectmapper, config its features, like serializer/deserializer, time format, name strategy, etc.
• Ref Doc: https://github.com/FasterXML/jackson-databind/wiki

Gson

• annotation way

   @SerializedName(value = "access_token")
   private String accessToken;

• globe way, setFieldNamingPolicy

   Gson gson =
       new GsonBuilder()
           .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
           .create();

• also could use util class

Note

• Spring integrated JacksonJson as message coverter, so could use globe way to do once/everywhere.
• Gson normally used on special case, as some modern api not compitiable with it, as swagger, so cloud declear it in anywhere in-need, more domain design style.

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