Jackson is a high-performance JSON processor used for Java. It is the most popular library used for serializing Java objects or Map to JSON and vice-versa. It is completely based on Java. Jackson tutorial provides all the basic and advanced concepts of the Jackson library.
Serialization and deserialization are two important concepts when working with JSON. Serialization is a process of converting Java objects into JSON whereas deserialization is a process of converting JSON into Java objects.
Features of Jackson library
Jackson library has the following features:
1. Easy to use
In order to simplify the common use cases, Jackson provides a high-level façade.
Jackson library is quite fast and has a low memory footprint. It is suitable for large systems.
3. No Dependency
In order to use Jackson, there is no need to use any other library except JDK. JDK is required because Jackson is based on Java.
4. Mapping free
There is no need to create mapping because it is by default provided for most of the objects to be serialized.
5. Open Source
It is freely available in the market. There is no need to purchase anything to use Jackson library. Just download it and use it in the code.
6. Clean JSON
It converts an object or a Map into a clean and compact JSON that is very easy to read.
In order to process JSON, Jackson provides three ways which are as follows:
1. Streaming API
By using streaming API, JSON data read and write as discrete events. Streaming API provides JsonParser and JsonGenerator for reading and writing data, respectively. Streaming API is one of the fastest and lowest overheads in read/write operations. It is the most powerful approach among others.
2. Tree Model
For reading and writing JSON data, it creates a tree representation of JSON documents. The ObjectMapper class is used to create a tree of nodes (JsonNode). However, it is not as faster as streaming API, but it is the most flexible approach for reading and writing JSON data.
3. Data Binding
It is a way to convert POJO to JSON and JSON to POJO. It is done by using annotations or a property accessor. Data binding is of two types, i.e., Simple Data Binding and Full Data Binding.
Simple Data Binding is used to convert JSON to and from null Object, Map, List, String, Number, and Boolean.
Full Data Binding is used to convert JSON to and from any of the Java types.
Jackson is completely based on Java, so before proceeding with this tutorial, it is required that you should have knowledge of Java.
This tutorial is helpful for the fresher and more experienced Java developers. This tutorial covers all the basics of the Jackson library.
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