Jackson Simple Data Binding

Internal

• Jackson

Overview

Simple data binding extracts data from JSON and initializes a in-memory Java object hierarchy. Unlike the tree model, which uses JsonNodes, simple data binding uses Maps, Lists, Strings, Numbers, Booleans and nulls to represent the JSON structure.

ObjectMapper.readValue() must be called with a Map type and it will build a Map/List/String/Number/Boolean hierarchy:

import com.fasterxml.jackson.databind.ObjectMapper;

ObjectMapper om = new ObjectMapper();

Map root = on.readValue(inputStream, Map.class);

Most generically:

Object root = mapper.readValue(src, Object.class);

It is possible to enable generic type information (like Map<String, Object>). For details, see Full Data Binding.

JSON to Java

ObjectMapper om = new ObjectMapper();

Map root = ...

om.writeValue(baos, root);

JSON to Java Code Example

https://github.com/NovaOrdis/playground/blob/master/json/jackson/simple-data-binding-json-to-java/src/main/java/io/novaordis/playground/json/jackson/simpledatabinding/json2java/Main.java