如何在Spring Boot Java中创建动态JSON结构类

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.HashMap;
import java.util.Map;

public class DynamicJson {
    private Map<String, Object> data;

    public DynamicJson() {
        data = new HashMap<>();
    }

    public void addField(String fieldName, Object value) {
        data.put(fieldName, value);
    }

    public String toJsonString() {
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            return objectMapper.writeValueAsString(data);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public JsonNode toJsonNode() {
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            return objectMapper.valueToTree(data);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

@RestController
public class MyController {
    @GetMapping("/dynamic-json")
    public String getDynamicJson() {
        DynamicJson dynamicJson = new DynamicJson();
        dynamicJson.addField("name", "John");
        dynamicJson.addField("age", 25);
        dynamicJson.addField("email", "john@example.com");

        return dynamicJson.toJsonString();
    }
}