如何使用java获取JSON对象和JSON数组中的值

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.8</version>
</dependency>

implementation 'com.google.code.gson:gson:2.8.8'

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

public class JsonExample {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\",\"age\":30,\"cars\":[\"Ford\",\"BMW\",\"Fiat\"]}";

        // 解析JSON对象
        JsonObject jsonObject = new Gson().fromJson(json, JsonObject.class);
        String name = jsonObject.get("name").getAsString();
        int age = jsonObject.get("age").getAsInt();
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);

        // 解析JSON数组
        JsonArray carsArray = jsonObject.get("cars").getAsJsonArray();
        for (JsonElement carElement : carsArray) {
            String car = carElement.getAsString();
            System.out.println("Car: " + car);
        }
    }
}

Name: John
Age: 30
Car: Ford
Car: BMW
Car: Fiat

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.3</version>
</dependency>

implementation 'com.fasterxml.jackson.core:jackson-databind:2.12.3'

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

public class JsonExample {
    public static void main(String[] args) throws Exception {
        String json = "{\"name\":\"John\",\"age\":30,\"cars\":[\"Ford\",\"BMW\",\"Fiat\"]}";

        ObjectMapper objectMapper = new ObjectMapper();
        JsonNode rootNode = objectMapper.readTree(json);

        // 获取JSON对象中的值
        String name = rootNode.get("name").asText();
        int age = rootNode.get("age").asInt();
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);

        // 获取JSON数组中的值
        JsonNode carsNode = rootNode.get("cars");
        for (JsonNode carNode : carsNode) {
            String car = carNode.asText();
            System.out.println("Car: " + car);
        }
    }
}

Name: John
Age: 30
Car: Ford
Car: BMW
Car: Fiat