How to seralize json document to java object automatically (using reflection) [duplicate]

Question

I have a simple API on nodejs that stores MongoDB documents. I have an API endpoint that retrieves documents in a json array.

I want to implement a client for this API in Java. Since Java supports reflection, I should't need to map each json document from the array into a java object with the same fields. There must be a way that simply maps one to another. However, it must support nested objects. Here's my object in Java:

public class Order {
    public Boolean deleted;
    //Use only when updating an order, _id is mongo's _id of order to be updated
    public String _id;
    static public class Product {
        public String name;
        public Integer quantity;
        public Float price;
    }
    public String clientName;
    public String clientPhone;
    public Integer seller_id;
    public Integer order_id;
    public String observations;
    public ArrayList<Product> products = new ArrayList<Product>();
    public Float total;
}

The Json Array that I receive from the API will have the same members: clientName, clientPhone, products, etc. I just need to map the Json Array element to Order.

There's a library that supports reflection (Jackson) and gives me a way to do the inverse: Order to Json, but I couldn't find a way to do what I want.

Jackson supports both serialization and deserialization. So does Gson. — Robby Cornelissen
– Robby Cornelissen, Commented Jan 23, 2020 at 3:46

Smile · Accepted Answer · 2020-01-23 05:21:01Z

1

Using Jackson, you can convert json to java object in following way.

//json variable is the String represenating the json you have received from API
Order order = new ObjectMapper().readValue(json, Order.class);

For more examples you can check Jackson examples

answered Jan 23, 2020 at 5:21

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