💱 Currency Converter — Fixer API

A Java console application for currency conversion using the Fixer API.

Homework project for the REST Client / External API lesson at AIT TR GmbH (cohort 60).

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📋 Task

Using the Fixer API, build a currency converter application where the user enters from the console:

• The currency to convert from
• The currency to convert to
• The amount to convert

The application prints the converted result.

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🛠 Tech Stack

• Java 23
• Spring Web (RestTemplate, UriComponentsBuilder) — no Spring Boot
• Jackson Databind (JSON deserialization)
• Lombok
• Maven

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🚀 How It Works

1. The app prompts the user to enter input via the console
2. Builds a request to https://api.apilayer.com/fixer/convert with query params from, to, amount
3. Sends an HTTP GET request with the API key in the apikey header using RestTemplate
4. Deserializes the JSON response into FixerResult
5. Prints the converted amount and target currency

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🖥 Console Example

Enter currency (from): USD
Enter currency (to): EUR
Enter amount: 100
Result: 91.25 EUR

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📁 Project Structure

src/main/java/ait/fixer/
├── FixerAppl.java          # Main class — reads console input, calls API, prints result
├── dto/
│   └── FixerResult.java    # Maps JSON response (success, date, result, query)
└── utils/
    └── DataFromConsole.java # Reads from, to, amount from Scanner

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⚙️ Getting Started

git clone https://github.com/AOgit/ait-fixer-api.git
cd ait-fixer-api

Run via IntelliJ IDEA or:

mvn compile exec:java -Dexec.mainClass="ait.fixer.FixerAppl"

Note: The API key is hardcoded in FixerAppl.java. To use your own key, register at apilayer.com and replace the value of apiKey.