How do I parse JSON objects from a JSONArray?

Question

I have a very large JSON file in the following format:

[{\"fullname\": \"name1\", \"id\": \"123\"}, {\"fullname\": \"name2\", \"id\": \"245\"}, {\"fullname\": \         


        

Answer 1

Make your life easy and use an ObjectMapper. This way you simply define a Pojo with the same properties as you json object.

In you case you need a Pojo that looks like this:

public class Person{
    private String fullname;
    private int id;

    public Person(String fullname, int id) {
        this.fullname = fullname;
        this.id = id;
    }

    public String getFullname() {
        return fullname;
    }

    public int getId() {
        return id;
    }
}

With that you only need to do:

ObjectMapper objectMapper = new ObjectMapper();
List persons = objectMapper.readValue(myInputStream, TypeFactory.defaultInstance().constructCollectionType(List.class, Person.class));

This is a hassle free and type safe approach.

Dependencies needed:

https://github.com/FasterXML/jackson-databind

        com.fasterxml.jackson.core
        jackson-databind