serialization java code example

Example 1: serialization of object in java

Serialization in Java is a mechanism of writing 
the state of an object into a byte-stream. 
It is mainly used in Hibernate, RMI, JPA, EJB and JMS technologies.

Example 2: java serializer

public class someClass {
//your lcode and logic...
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(MyAwesomeClass.class, new MyAwesomeSerializer());
mapper.registerModule(module);

jsonNode = mapper.convertValue(myAwesomeObject, JsonNode.class);
//... your code and logic
}
  
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();
    }

}

Example 3: what is serialization in java

Serialization; when we MAP a Java object to API JSON
format (CONVERT JAVA OBJECT TO JSON);

Deserialization; API JSON/XML ^ MAP it to Java Object
(JSON TO JAVA OBJECT)

Example 4: import java.io.serializable

import java.io.Serializable;

Example 5: serializable in JAVA

public class Employee implements java.io.Serializable {
   public String name;
   public String address;
   public transient int SSN;
   public int number;
   
   public void mailCheck() {
      System.out.println("Mailing a check to " + name + " " + address);
   }
}

Example 6: serialization in java

Serialization; when we MAP a Java object to API JSON
format (CONVERT JAVA OBJECT TO JSON);

Deserialization; API JSON/XML ^ MAP it to Java Object
(JSON TO JAVA OBJECT)
Serialization: POJO to JSON (or string, byte array) 
when we MAP a Java object to API JSON format (Java to JSON)
Car car = new Car(); car.setMake(“Toyota”); 
car.setModel(“Camry”); given().body(car).when().post(uri)
De-Serialization: JSON to POJO 
( API JSON/XML → MAP it to Java Object (JSON TO JAVAOBJECT)
Car car2 = new Car(); car2=when().get(uri).body.as(car.class); 
 car.setMake(“Toyota”); car.setModel(“Camry”);