java jackson serializer code example

Example 1: java json 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
}
 
//serializer 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();
    }

}

Example 2: jackson serialize xml

/**
* This function writes serializes the Java object into XML and writes it
* into an XML file.
*/
public static void serializeToXML() {
    try {
        XmlMapper xmlMapper = new XmlMapper();

        // serialize our Object into XML string
        String xmlString = xmlMapper.writeValueAsString(new PhoneDetails("OnePlus", "6.4", "6/64 GB"));

        // write to the console
        System.out.println(xmlString);

        // write XML string to file
        File xmlOutput = new File("serialized.xml");
        FileWriter fileWriter = new FileWriter(xmlOutput);
        fileWriter.write(xmlString);
        fileWriter.close();
    } catch (JsonProcessingException e) {
        // handle exception
    } catch (IOException e) {
        // handle exception
    }
}

public static void main(String[] args) {
    System.out.println("Serializing to XML...");
    serializeToXML();
}