Скачать или смотреть How to Parse a JSON Object to a Java Object Using SerializedName Annotation

Learn how to effectively parse JSON data into Java objects with clear step-by-step guidance on using the `SerializedName` annotation for proper key mapping.
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This video is based on the question https://stackoverflow.com/q/65543057/ asked by the user 'MadMax' ( https://stackoverflow.com/u/13373575/ ) and on the answer https://stackoverflow.com/a/65543678/ provided by the user 'Juan Fraga' ( https://stackoverflow.com/u/12110459/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Parse a JSON Object to a Java Object Using SerializedName Annotation

When dealing with JSON data in Java, you might face challenges, especially when the keys in your JSON do not match the variable names in your Java classes. This often results in null values when attempting to deserialize the JSON into your Java objects. In this guide, we’ll walk through a specific example where you can learn how to properly parse a JSON object that contains various formats, ensuring that your Java object gets populated with the expected values.

The Problem:

You have a JSON object representing different format types and their corresponding URLs. However, you are experiencing issues with parsing these keys into a Java object. You are getting null values for certain fields in your Java class even though you are able to access the rest of the keys correctly.

Here’s a snippet of the JSON you are trying to parse:

[[See Video to Reveal this Text or Code Snippet]]

The Solution:

To ensure that your Java class maps correctly with the JSON keys, you can utilize the @ SerializedName annotation. This annotation specifies the name of the field as it appears in the JSON and allows for proper serialization and deserialization.

Step 1: Include Required Libraries

Before you proceed, ensure you have the necessary dependencies in your build file (such as Gson) to facilitate JSON parsing.

Step 2: Update Your Java Class

Modify your Format class to use the @ SerializedName annotation for each field that does not follow standard naming conventions. Here’s how your updated class should look:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Deserialize the JSON

With your Java class properly annotated, you can now easily deserialize the JSON string into a Java object using Gson. Here's how to do it:

[[See Video to Reveal this Text or Code Snippet]]

In this line, we are utilizing the fromJson method provided by Gson to convert the JSON string into a Format object.

Conclusion

By employing the @ SerializedName annotation, you can ensure that your Java object's fields correspond correctly to the keys in your JSON data. This simple adjustment can resolve the issue of receiving null values and make your parsing process straightforward and reliable. Now, you can go ahead and parse your JSON objects with confidence. Have fun coding!