Jackson Simple Data Binding: Difference between revisions
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JSON to Java parsing is done by <tt>ObjectMapper.readValue()</tt>, which must be called with a type corresponding to the top-level JSON data type, usually a Map. | JSON to Java parsing is done by <tt>ObjectMapper.readValue()</tt>, which must be called with a type corresponding to the top-level JSON data type, usually a Map. | ||
<pre> | <pre> | ||
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Map root = on.readValue(inputStream, Map.class); | Map root = on.readValue(inputStream, Map.class); | ||
</pre> | </pre> | ||
Most generically: | Most generically: |
Revision as of 20:20, 26 February 2017
Internal
Overview
Simple data binding extracts data from JSON and initializes an in-memory Java object hierarchy. Unlike the tree model, which uses JsonNodes, simple data binding assembles the hierarchy representing the JSON data out of Maps, Lists, Strings, Numbers, Booleans and nulls. A Map/List/String/Number/Boolean hierarchy can be written out as JSON content.
JSON to Java
JSON to Java parsing is done by ObjectMapper.readValue(), which must be called with a type corresponding to the top-level JSON data type, usually a Map.
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 Code Example
Java to JSON
ObjectMapper om = new ObjectMapper(); Map root = ... om.writeValue(baos, root);