ジャックソン

1.@JsonPropertyOrder

@JsonPropertyOrder(value={"name","id","json"})の役割:jsonシーケンス化後の出力順序を変更する

@JsonPropertyOrder(value ={"name","id","json"})
public class MyBean {
    @JsonProperty("id")
    private int id;
    @JsonProperty("name")
    private String name;
    @JsonRawValue
    private String json;
    public MyBean(int id, String name, String json) {
        this.id = id;
        this.name = name;
        this.json = json;
    }
}

public static void main(String[] args) throws JsonProcessingException{
        MyBean myBean = new MyBean(1,"zz","{'attr':false}");
        String result = new ObjectMapper().writeValueAsString(myBean);
        System.out.println(result);
}

結果:

{"name":"zz","id":1,"json":{'attr':false}}

2.@JsonRawValue

役割:json文字列をjsonにシーケンス化し、コードは上記のようにします.

3.@JsonValue

≪アクション｜Action｜oraolap≫:指定した列挙値を出力します.

public enum BeanEnum {
    TYPE1(1,"Type A"),TYPE2(2,"Type B");
    private Integer id;
    private String name;
    private BeanEnum(Integer id, String name) {
        this.id = id;
        this.name = name;
    }
    @JsonValue
    public String getName(){
        return name;
    }
}

public static void main(String[] args) throws JsonProcessingException{
        String result = new ObjectMapper().writeValueAsString(BeanEnum.TYPE1);
        System.out.println(result);
}

結果

  "Type A"

4.@JsonRootName

役割:シーケンス化されたjsonにルート名を追加する

@jsonRootName(value="user")
public class User{
    public int id;
    public String name;
}

結果:

{
    "user"{
        "id":1.
        "name":"zz"
    }
}