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Data Binding in Jackson

The Data Binding concept is used to serialize and deserialize the data. It is used for converting JSON into POJO or vice-versa by using annotations or property accessors.

Data Binding API is of two types:

  • Simple Data Binding
  • Full Data Binding

1. Simple Data Binding

Simple Data Binding is used to convert either JSON into Map, List, String, Number, Boolean and null objects or Map, List, String, Number, Boolean and null objects into JSON.

The following table defines the relationship between JSON and Java types:

JSON Type Java Type
Object LinkedHashMap<String,Object>
Array ArrayList<Object>
String String
Complete Number Integer, Long or BigInteger
Fractional Number Double / BigDecimal
True | False Boolean
Null Null

Let's take an example to understand how Simple Data Binding API works:

SimpleDataBinding.java

Output:

Data Binding in Jackson
Data Binding in Jackson

2. Full Data Binding

Full Data Binding is also used to convert JSON into any Java type and vice-versa. Full Data Binding mainly refers to the mapping of JSON into any Java type.

In order to convert JSON into any Java type and read the JSON data, the following three steps are used:

1. Create an instance of the ObjectMapper class.

3. Map Java object to JSON content.

Let's take an example to understand how Full Data Binding works:

FullDataBinding.java

Output:

Data Binding in Jackson





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