import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class JsonReaderExample {
public static void main(String[] args) {
JSONParser parser = new JSONParser();
String jsonString = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";
try {
JSONObject jsonObject = (JSONObject) parser.parse(jsonString);
String name = (String) jsonObject.get("name");
long age = (long) jsonObject.get("age");
String city = (String) jsonObject.get("city");
System.out.println("Name: " + name);
System.out.println("Age: " + age);
System.out.println("City: " + city);
} catch (ParseException e) {
e.printStackTrace();
}
}
}
import org.json.simple.JSONObject;
public class JsonWriterExample {
public static void main(String[] args) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("name", "John");
jsonObject.put("age", 30);
jsonObject.put("city", "New York");
String jsonString = jsonObject.toJSONString();
System.out.println(jsonString);
}
}
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonSerializationExample {
public static void main(String[] args) {
ObjectMapper objectMapper = new ObjectMapper();
// Serialization - Java object to JSON
Person person = new Person("John", 30, "New York");
try {
String jsonString = objectMapper.writeValueAsString(person);
System.out.println(jsonString);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
// Deserialization - JSON to Java object
String json = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";
try {
Person deserializedPerson = objectMapper.readValue(json, Person.class);
System.out.println(deserializedPerson);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
}
class Person {
private String name;
private int age;
private String city;
// getters and setters
public Person(String name, int age, String city) {
this.name = name;
this.age = age;
this.city = city;
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + ", city=" + city + "]";
}
}
<!-- JSON.simple -->
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<!-- Jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.4</version>
</dependency>
