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Scan QR Code with Java REST API

In this step‑by‑step tutorial you’ll learn how to scan QR codes with a Java REST API. We’ll guide you through creating a QR scanner using a Java‑based API powered by the Aspose Cloud SDK, and show you how to specify the target barcode or QR types for fast recognition from any image.

Prerequisite

Steps for QR Photo Scanner with Java REST API

  1. Add references to Aspose.BarCode.Cloud.Sdk.Api and Aspose.BarCode.Cloud.Sdk.Model to access API and model classes
  2. Create a Configuration object and set the API base URL, client ID, and client secret for authentication with Aspose.BarCode Cloud
  3. Specify the image file name and open it as a file stream to prepare it for recognition
  4. Create an instance of RecognizeApi using the configured Configuration object
  5. Call the RecognizeMultipartAsync method with DecodeBarcodeType.QR and the file stream to detect QR codes in the image
  6. Loop through the recognized barcodes in the response and display their values and types

These steps summarize the process to develop a QR code scanner app with Java Low Code API. First, set up the environment by adding Aspose.BarCode.Cloud.Sdk.Api and Aspose.BarCode.Cloud.Sdk.Model, create a Configuration object with your credentials, and load the image file (MultipleQRCodes.png) into a FileStream. Then, use the RecognizeApi class to call RecognizeMultipartAsync, and loop through the results to display each QR code’s BarcodeValue and Type.

Code to Read QR Code with Java REST Interface

The code shown above illustrates how to scan QR code from image with Java REST Interface. By specifying DecodeBarcodeType (e.g., QR), you direct the API to search exclusively for that barcode type, which speeds up the scan, improves reliability, and prevents unwanted barcodes from being detected.

In this brief tutorial we walked through building a QR‑code reader with a Java REST API. When you’re ready to tackle barcodes, check out our guide on Scan Barcode with Java REST API.

 

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