Use the Jackson Core framework to achieve customized serialization and deeflowing logic
Use the Jackson Core framework to achieve customized serialization and deeflowing logic
Jackson is a powerful Java library that is used to serialize the Java object to JSON format, and transformed the data of the JSON format into a Java object.Jackson Core is the core module of the Jackson library, which provides the basic function of processing JSON data.By customizing the logic of serialization and deepening serialization, we can control the formation of JSON data to meet special needs.
The following are the basic steps of using the Jackson Core framework to achieve custom serialization and deepericularization logic:
1. Create the Java class to indicate the object to be serialized.
public class Person {
private String name;
private int age;
// Construct function, Getter, and Setter method
}
2. Customized serial logic: Create a custom serializer that implements the JSONSERIALIZER interface.
public class PersonSerializer extends JsonSerializer<Person> {
@Override
public void serialize(Person person, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
jsonGenerator.writeStartObject();
jsonGenerator.writeStringField("姓名", person.getName());
jsongenerator.writenumberfield ("age", person.getage ());
jsonGenerator.writeEndObject();
}
}
3. Register a custom serializer: Create an ObjectMapper object, and register a custom serializer with SimpleModule.
public class Main {
public static void main(String[] args) throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(Person.class, new PersonSerializer());
objectMapper.registerModule(module);
Person person = new Person();
Person.setname ("Zhang San");
person.setAge(20);
String json = objectMapper.writeValueAsString(person);
System.out.println(json);
}
}
In the above example, we created a custom PersonSerializer, which sequencer serializes the Person object into a custom JSON format.We then created an ObjectMapper object and registered a custom serializer.Finally, we converted the Person object to a JSON string.
4. Custom Logic Logic: Create a customized derivative to implement the JSONDESERIALIZER interface.
public class PersonDeserializer extends JsonDeserializer<Person> {
@Override
public Person deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
JsonNode rootNode = jsonParser.getCodec().readTree(jsonParser);
String name = rootNode.get("姓名").asText();
int age = rootNode.get ("age") .asint ();
Person person = new Person();
person.setName(name);
person.setAge(age);
return person;
}
}
5. Register a customizer: Register a customized romanticizer in the ObjectMapper object.
public class Main {
public static void main(String[] args) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addDeserializer(Person.class, new PersonDeserializer());
objectMapper.registerModule(module);
String json = "{\" name \ ": \" Zhang San \ ", \" Age \ ": 20}";
Person person = objectMapper.readValue(json, Person.class);
System.out.println(person.getName());
System.out.println(person.getAge());
}
}
In the above example, we created a custom PersondDeserializer that converts the custom JSON format into a Person object.Then, we created an ObjectMapper object and registered a customizer.Finally, we converted the JSON string to Person object.
By customizing serialization and deesessment logic, we can control the generated JSON data format as needed and restore objects from JSON data.Jackson Core provides flexible and powerful functions, enabling us to easily achieve custom serialization and derivative logic.
