• Given the user defined object or POJO having date field, we would like to serialize the POJO to JSON.
• During serialization, we would like save date as a timestamp or ISO format.
• We will use the Jackson’s ObjectMapper to achieve the conversion.
• We will create Person class and we will perform the following operations with Person class.
  1. Convert Person Object to JSON
     • Serializedate as time stamp (default serialization)
  2. Convert Person Object to JSON
     • Serialize date parameter as ISO format
  3. Convert the JSON to person object
     • DeSerializedate as timestamp

Convert object having date to/from JSON in java (Jackson ObjectMapper example) By February 13, 2016. Given the user defined object or POJO having date field, we would like to serialize the POJO to JSON. During serialization, we would like save date as a timestamp or ISO format.

Jackson ObjectMapper Maven Dependencies

Program – Convert Date to/from timestamp in java (POJO <->JSON)

1.) Person Class:

• The person class containing date data member.
• We have overloaded toString method to display content of person object.

2.) JSONObjectConverter Class:

We are performing following operation in JSONObjectConverter class.

1. Convert Person Object to JSON
   • Serializedate as time stamp (default serialization)
2. Convert Person Object to JSON
   • Serialize date parameter as ISO format
3. Convert the JSON to person object
   • DeSerializedate as timestamp

Download Example Code-Jackson Object (Date) to JSON

Output – Date serialization & deserialization in java (POJO <-> JSON)

After publishing over 50 Retrofit blog posts we've gathered enough feedback that a lot of developers would love an extensive introduction to Google's Gson. Gson is a very powerful library to map data structures represented as JSON to Java objects. Of course, it also supports the other way around and can create an appropriate JSON representation of your Java objects.

If you're interested in where this series is going, check out our series outline:

Gson Series Overview

1. Getting Started with Java-JSON Serialization & Deserialization

Gson Dependency

This guide will be hands-on and start with some serialization in a minute. Since a lot of our readers are Android developers, we'll tailor it for you, but Gson can be used in any Java environment. Before we can get started, we need to pull in the Gson library to our project. At the time of writing, the latest version is 2.8.5. If you're using Gradle, add the following line:

If you're using Maven, you can add the following dependency:

For the poor guys using neither dependency management system, you can download the jar on the official GitHub repository.

Basics of Java-JSON Serialization

So let's do some serialization! Serialization in the context of Gson means mapping a Java object to its JSON representation. In the next few tutorials our data is going to get more complex, but for now we'll start with a very plain UserSimple object:

The user object has four properties:

• The user's name is a String object
• The user's email is also a String object
• The user's age is an integer, meaning the age is stored in years (for example 26 and not the exact birthday!)
• Finally a boolean flag isDeveloper

Our Android or Java application needs to convert a UserSimple object to its JSON representation. Assuming we keep the member names the same, we would expect such a JSON for Norman, the author of this blog post:

So let's see how we can do the conversion with Gson. First of all, we need to create a Java object for Norman:

In order to do the serialization, we need a Gson object, which handles the conversion. We can simply use the constructor:

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Next, we need to call the function toJson() and pass the UserSimple object:

The userJson object contains the following value:

Gson changed the order of the properties (to alphabetically), but the content is identical! Note how Gson respected the types. String values were wrapped in ', while integer values had no wrapping. We didn't have to mess around with JSON objects or copy single members. A single call to Gson was enough to map the entire object. This comes in extremely handy when we're working with complex data structures. But before going too deep, let's test the other direction. Can Gson create a Java object from the above JSON?

Basics of JSON-Java Deserialization

First of all, we need to create a String, which contains the above-mentioned JSON:

We changed the ' to ' to avoid tons of ' escaping. Nevertheless, it works either way. The next step is, as you probably have guessed, to create a Gson instance:

Finally, we've to map from a JSON to a Java object with fromJson():

Note how we've to pass the expected Java object as the second parameter. Otherwise Gson doesn't know what it should map the JSON to. It's not a magician!

If we attach a debugger and check the resulting userObject it'll show us that Gson successfully mapped all properties correctly:

Next Steps & Outlook

In this getting started post you've seen the basic usage of Gson. We've shown how easy it is to map from and to JSON data. We're sure you've a bunch of questions at the moment:

• Do the Java model classes need a constructor/getter/setter?
• Can the Java model fields be private?
• How do null values get handled?
• What if the Java class has different member naming than the JSON?
• How to (de)serialize arrays/lists of objects
• How to (de)serialize nested objects
• Does Gson keep a defined default value for a class property while executing .fromJson() and there isn’t any value for that property available in JSON?

No worries, we'll get to all of them in the upcoming weeks. If you've a specific topic in mind, let us know in the comments or on twitter @futurestud_io.

Make it rock & enjoy coding!

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Mapping JSON to Java objects (and vice versa) is from the 90s. Gson is the modern solution to map between Java and JSON automatically with minimal effort.

You just need to know how! Learn every detail about Gson's capabilities, configuration & customization in our book.

Our book contains everything you need to know about Gson. Value your time and save yourself from endless hours of Google searches to quick fix your issues. Invest in your knowledge upfront and into a clean solution. We'll make you the Gson expert on your team.

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