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Custom JSON Serialization With GSON
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Intro

Here’s a curious one, in which I found myself with a limitation of not being able to output JSON with scientific notation values.

wait, what?
wait, what?

If you’re wondering why that is, since both JSON and JavaScript allow scientific notation of number values, you are absolutely correct and that’s a great question. The strange thing was that I found myself outputting perfectly valid JSON to be consumed by something specific which didn’t allow scientific notation. I’m not entirely sure why that was a bridge I had to cross, but the path of least resistance involved my forcing the output values to be serialized in standard notation.

Serializing JSON With GSON

Normally, serialization of JSON via GSON is so simple, a developer with merely a basic understanding of Java could pull it off 😜. Here’s a sample for baseline comparison.

So, since the formatting of the numeric values, which I was passing into a Map as Doubles for serialization, so we’ll be registering a new TypeAdapter with the JsonSerializer and instruct it how to handle the value in place of the default. Here’s the result, wrapped into a method in a utility class.

Now that we have a new way of handling our Gson instantiation, we can use it as such:

Summary

I’m still left questioning why I had to do this, but the exercise is an intersting one anyway. Should someone need to customize their responses even further, this is a great place to start from. I’m still a pretty big fan of GSON and while it may not be for everyone, or even the best option in OSGi plugin development with options like JAX-RS and others, it’s certainly a heavily used library that is both useful and generally easy to implement.

🍻



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https://edm00se.io/java/custom-json-serilization/
Jan 23, 2017
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