Скачать или смотреть How to Easily Convert JSON to CSV Using Groovy Script

Learn how to parse JSON files into CSV format using Groovy, focusing on extracting specific keys like `key` and `summary`. Get step-by-step instructions and example code for better understanding.
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Parsing JSON to CSV in Groovy

Are you facing challenges in converting JSON data into CSV format in Groovy? This is a common problem, especially if you are working with APIs or data storage formats that return JSON data. In this guide, we will break down a solution for extracting specific information from a JSON file formatted as an API response, and transforming that into a simplified CSV format.

Understanding the Problem

Suppose you have a JSON file that contains several fields, but you only want specific data points. In this case, you want to extract key and summary from a list of issues. The goal is to create a CSV file with two columns key and summary, clearly presenting relevant data without the clutter of extraneous information.

Here is an example of your input JSON structure:

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And the expected output in CSV format is:

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The Solution

To solve this problem, we will create a Groovy script that precisely extracts the desired fields from the JSON and formats them into CSV. Below, we will go through the solution step by step.

Step 1: Import Required Libraries

First, ensure that you have the JSON library available in your Groovy environment. You will need this for parsing JSON data.

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Step 2: Configure the Extraction Logic

In this script, we will define a configuration that maps CSV headers to extraction logic. This configuration helps maintain clarity and allows you to easily adjust what data you plan to extract later on.

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Step 3: Null Handling and CSV Formatting

To handle null values and correctly format the CSV output, we'll create helper functions:

encode(e) for cleaning up individual fields.

csvLine(items) to construct CSV lines by joining the encoded items.

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Step 4: Parsing the JSON File

Next, we need to parse the JSON file. Assuming your input JSON file is named data.json, use the JsonSlurper to load its contents:

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Conclusion

With this script, you will be able to parse a JSON file and output the desired CSV format cleanly. Simply update the config map as needed if the structure of your JSON changes, and you can adapt your script accordingly.

Final Notes

Converting JSON to CSV using Groovy scripts can simplify data management and presentation when working with APIs or datasets. Feel free to adapt the provided code snippet to suit your specific requirements!

If you have any questions or need further assistance, don’t hesitate to ask. Happy coding!