从java8中的输入json中检索get jsonNode

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.5</version>
</dependency>

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

public class JsonNodeExample {
    public static void main(String[] args) {
        String jsonString = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            JsonNode jsonNode = objectMapper.readTree(jsonString);

            // 获取name节点的值
            String name = jsonNode.get("name").asText();
            System.out.println("Name: " + name);

            // 获取age节点的值
            int age = jsonNode.get("age").asInt();
            System.out.println("Age: " + age);

            // 获取city节点的值
            String city = jsonNode.get("city").asText();
            System.out.println("City: " + city);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}