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Scan QR Code with Java REST API

This guide explains how to scan QR code with Java REST API. You will learn to develop a QR scanner with Java-based API using a Java-based Cloud SDK. It will assist you in defining the target barcode or QR types for quick recognition from a given 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 above code demonstrates how to scan QR code from image with Java REST Interface. By setting DecodeBarcodeType (for example, QR), you’re telling the API to only look for that kind of code instead of checking every possible type. This makes the scan quicker, more reliable, and avoids scanning undesired barcodes.

This short tutorial has taught us the process for developing a QR reader. To read barcodes, refer to the article on Scan Barcode with Java REST API.

 

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