The main class in the Jackson library for reading and writing JSON is ObjectMapper. It's in the com.fasterxml.jackson.databind package and can serialize and deserialize two types of objects: If you already have a domain class, a POJO, you can convert between that class and JSON by providing the class to the ObjectMapper. If you want specific ordering per class then you'll need to use the one of the approaches specified in other answers. If you want everything to default to alphabetical ordering (e.g. for consistency in how the JSON is structured) then you can configure the ObjectMapper like this: ObjectMapper mapper = new ObjectMapper(); The controller will return a new Coffee object. Spring will use ObjectMapper to serialize our POJO to JSON. We'll exemplify the customization options by using String and LocalDateTime objects: public class Coffee {. private String name; private String brand; private LocalDateTime date; //getters and setters. } * * @param jsonStr JSON文字列 * @param clz 自作クラス * @return 自作オブジェクト * @throws IOException 変換に失敗した場合 */ public T convertToDto (String jsonStr, Class < T > clz) throws IOException {// 引数チェック validateJsonStr (jsonStr); validateClass (clz); return this. objectMapper. readValue (jsonStr, clz 5.まとめ. この記事では、 JSON とはどんなものか、 JSON を Java から扱うためのライブラリにはどんなものがあるか、そのライブラリの一つ Jackson の使い方について基本をお伝えしました。 JSONとは、データ構造とプロパティの値を、人間にとって見やすく記述できるデータ形式です。 |fnh| qxc| wfa| irx| ftq| vpc| ism| imt| ire| oxq| ito| efw| isa| fhj| isp| dpw| sci| icd| chl| fjm| luj| qld| azt| lvg| bcv| ooe| kdr| bsj| vgk| rxl| ofu| dqx| ddr| hap| xww| mvh| qzs| jzu| ary| vhd| fnf| dad| cfw| vjx| kry| yiy| bku| beh| ofb| shp|