仅将少数 JSON 字段转换为 API object

Question

In the JSON reponse that an API gives me back, i have more than 100 fields, but am interested in only 3 fields. For example, if below is the full JSON response

"text": {
        "data": "Click Here",
        "size": 36,
        "style": "bold",
        "name": "text1",
        "hOffset": 250,
        "vOffset": 100,
        "alignment": "center",
        "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
    }

I want only 3 fields

"data": "Click Here",
"size": 36,
"style": "bold"

This is my response object in ArunApi.java would look like

private String data;
private Integer size;
private String style;

When i make a REST Call (below is the snippet), it fails

var response = webClient
                .get()
                .uri(endPoint)
                .retrieve()
                .bodyToMono(ArunApi.class)
                .block();

Since i have only 3 fields in my API, the conversion isn't happening at all. Please help

Answer 1

You can annotate your class with @JsonIgnoreProperties(ignoreUnknown = true) if you are using Jackson library. Otherwise, depending on which library you are using, you can search for configuration to ignore fields.

https://github.com/FasterXML/jackson-annotations

Answer 2

You can parse the whole JSON string with GenSON. With the function parseKeys() you can get a HashMap that contains all the keys and extract the first three. GenSON is a new library that I created because of problems similar to yours. Link: https://github.com/EvgeniGenchev/GenSON-lib .

Answer 3

You can try to use an abstract class with JsonTypeInfo and JsonSubTypes annotations to receive the data and then map with any thing subclass you need. For example:

@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        property = "type")
@JsonSubTypes({
        @JsonSubTypes.Type(value = RecurringTriggerJsonModel.class, name = "RECURRING"),
        @JsonSubTypes.Type(value = SimpleTriggerJsonModel.class, name = "SIMPLE"),
        @JsonSubTypes.Type(value = CronTriggerJsonModel.class, name = "CRON")
})
public abstract class TaskTriggerJsonModel {

}