如何使用 Jackson 将对象序列化为 json，包括 ArrayList

Question

I have this simple java object

public class Order {
    static public class Product {
        public String name;
        public Integer quantity;
        public Float price;
    }
    public String clientName;
    public String clientPhone;
    ArrayList<Product> products = new ArrayList<Product>();
    public Float total;
}

I want to serialize it to JSON using Jackson. I do like this:

    String _json;
    ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
    _json = ow.writeValueAsString(order);

but it won't serialie the array list in my order, only the other members.

How do I serialize an object that contains an ArrayList ? If it's not possible is there another container class that I can use which is easy to serialize?

Answer 1

Jackson depends on public accessors to determine fields to serialize.

Your list is the only field that isn't publicly exposed, so that's why it's hidden in the output