java jackson code example
Example 1: java json deserializer
private Car parseCar(JsonNode node) {
Car car;
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule().addDeserializer(Car.class, new CarDeserializer());
mapper.registerModule(module);
organization = mapper.convertValue(node, Car.class);
return car;
}
public class CarDeserializer extends StdDeserializer<Car> {
public CarDeserializer() {
super(Car.class);
}
@Override
public Car deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JodaModule());
Car car = new Car();
car.setName(getValueAsText(root, "carName"));
car.setDoorCount(getValueAsInt(root,"doorCount"));
car.setColor(getValueAsText(root,"color"));
car.setType(getValueAsText(root,"type"));
return car;
}
}
Example 2: JSONObject java
import org.json.simple.JSONObject;
class JsonEncodeDemo {
public static void main(String[] args) {
JSONObject obj = new JSONObject();
inputJSON.put("subscriberName", "subscriber");
inputJSON.put("msisdn","7055389495");
System.out.print(obj);
}
}
Example 3: java serialize object to json
public class someClass {
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(MyAwesomeClass.class, new MyAwesomeSerializer());
mapper.registerModule(module);
jsonNode = mapper.convertValue(myAwesomeObject, JsonNode.class);
}
public class MyAwesomeSerializer extends StdSerializer<MyAwesomeClass> {
public MyAwesomeSerializer() {
super(MyAwesomeClass.class);
}
@Override
public void serialize(MyAwesomeClass myAwesomeClass, JsonGenerator jgen, SerializerProvider provider) throws IOException {
ObjectMapper mapper = new ObjectMapper();
jgen.writeStartObject();
jgen.writeStringField("name", myAwesomeClass.getName());
jgen.writeStringField("age", myAwesomeClass.getAge());
jgen.writeArrayFieldStart("hobbies");
for (Hobby hobby : myAwesomeClass.getHobbies()) {
jgen.writeObject(mapper.convertValue(hobby, JsonNode.class));
}
jgen.writeEndArray();
jgen.writeEndObject();
}
}