Jackson将额外的字段反序列化为Map

import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class JacksonExample {
    private Map<String, Object> extraFields = new HashMap<>();

    @JsonAnySetter
    public void setExtraField(String key, Object value) {
        extraFields.put(key, value);
    }

    public Map<String, Object> getExtraFields() {
        return extraFields;
    }

    public static void main(String[] args) {
        String json = "{\"name\": \"John\", \"age\": 30, \"extraField1\": \"value1\", \"extraField2\": \"value2\"}";

        ObjectMapper objectMapper = new ObjectMapper();
        try {
            JacksonExample example = objectMapper.readValue(json, JacksonExample.class);
            System.out.println(example.getExtraFields());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}