Java JSON编写双倍代码

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>

import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.HashMap;
import java.util.Map;

public class JacksonExample {
    public static void main(String[] args) throws Exception {
        ObjectMapper objectMapper = new ObjectMapper();

        Map<String, Object> data = new HashMap<>();
        data.put("name", "John");
        data.put("age", 30);

        String jsonString = objectMapper.writeValueAsString(data);
        System.out.println(jsonString);
    }
}

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.9</version>
</dependency>

import com.google.gson.Gson;
import java.util.HashMap;
import java.util.Map;

public class GsonExample {
    public static void main(String[] args) {
        Gson gson = new Gson();

        Map<String, Object> data = new HashMap<>();
        data.put("name", "John");
        data.put("age", 30);

        String jsonString = gson.toJson(data);
        System.out.println(jsonString);
    }
}

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20210307</version>
</dependency>

import org.json.JSONObject;

public class OrgJsonExample {
    public static void main(String[] args) {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name", "John");
        jsonObject.put("age", 30);

        String jsonString = jsonObject.toString();
        System.out.println(jsonString);
    }
}