Getting Started with Dynamsoft Barcode Reader SDK Java Edition

In this guide, you will learn step by step on how to build a barcode reading application with Dynamsoft Barcode Reader SDK using Java.

Read more on Dynamsoft Barcode Reader Features

Getting Started with Dynamsoft Barcode Reader SDK Java Edition

System Requirements

To find out whether your environment is supported, please read the System Requirements.

Installation

If you don’t have a Maven project, you can create one with the following steps:

Create a new directory for your project
Navigate to the directory and run the following command to create a Maven project:

mvn archetype:generate -DgroupId=com.dynamsoft -DartifactId=dbr-hello-world -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false 

Add the Dynamsoft Barcode Reader dependency to your pom.xml file:

<repositories> <repository> <id>dbr</id> <url>https://download2.dynamsoft.com/maven/dbr/jar</url> </repository> </repositories> <dependencies> <dependency> <groupId>com.dynamsoft</groupId> <artifactId>dbr</artifactId> <version>11.0.6100</version> </dependency> </dependencies> 

Build Your First Application

Let’s start by creating a console application which demonstrates how to use the minimum code to read barcodes from an image file.

You can download the entire source code from here.

Create a New Project

Create a new Java source file named ReadAnImage.java in your project’s src/main/java directory.

Include the Library

Import the necessary packages at the beginning of your Java file:

import com.dynamsoft.core.EnumErrorCode; import com.dynamsoft.cvr.CaptureVisionRouter; import com.dynamsoft.cvr.CapturedResult; import com.dynamsoft.cvr.EnumPresetTemplate; import com.dynamsoft.dbr.BarcodeResultItem; import com.dynamsoft.dbr.DecodedBarcodesResult; import com.dynamsoft.license.LicenseError; import com.dynamsoft.license.LicenseException; import com.dynamsoft.license.LicenseManager; 

Initialize the License Key

Add the following code inside the main method to initialize the license for using the SDK in the application:

public class ReadAnImage { public static void main(String[] args) { try { LicenseError licenseError = LicenseManager.initLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9"); if (licenseError.getErrorCode() != EnumErrorCode.EC_OK) { System.out.println("License initialization failed: ErrorCode: " + licenseError.getErrorCode() + ", ErrorString: " + licenseError.getErrorString()); return; } } catch (LicenseException e) { System.out.println("License initialization failed: ErrorCode: " + e.getErrorCode() + ", ErrorString: " + e.getErrorString()); return; } // codes from following steps } } 

The string “DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9” here is a free public trial license. Note that network connection is required for this license to work. Alternatively, you can request a 30-day free offline trial license from the Customer Portal.

Create a CaptureVisionRouter Instance

CaptureVisionRouter cvRouter = new CaptureVisionRouter(); 

Invoke the Barcode Capturing

CapturedResult[] results = cvRouter.captureMultiPages("[PATH-TO-THE-IMAGE-FILE]", EnumPresetTemplate.PT_READ_BARCODES); 

Please change the [PATH-TO-THE-IMAGE-FILE] to a real barcode image file path.

Filter and Get Barcode Details

if (results == null || results.length == 0) { System.out.println("No barcode detected."); } else { for (int index = 0; index < results.length; index++) { CapturedResult result = results[index]; if (result.getErrorCode() != EnumErrorCode.EC_OK) { System.out.println("Error: " + result.getErrorCode() + ", " + result.getErrorString()); } DecodedBarcodesResult barcodeResult = result.getDecodedBarcodesResult(); BarcodeResultItem[] items = barcodeResult != null ? barcodeResult.getItems() : null; if (items == null || items.length == 0) { System.out.println("No barcode detected."); } else { System.out.println("Decoded " + items.length + " barcodes."); for (int i = 0; i < items.length; i++) { BarcodeResultItem item = items[i]; System.out.println("Result " + (i + 1)); System.out.println("Barcode Format: " + item.getFormatString()); System.out.println("Barcode Text: " + item.getText()); } } } } 

Build and Run the Project

Save the ReadAnImage.java file.
Open terminal or command prompt and navigate to the project root directory.
Compile and run the project using Maven:

mvn compile exec:java -Dexec.mainClass="ReadAnImage"

You will see the output message in the console like

Decoded 2 barcodes Result 1 Barcode Format: XXX Barcode Text: XXX Result 2 Barcode Format: XXX Barcode Text: XXX 

Process Multiple Images

If, instead of processing one single image, you need to process many images at once, you can follow these steps:

These steps follow the step Create a CaptureVisionRouter Instance mentioned above.

You can download the entire source code from here.

Create an ImageSource as the Input

An ImageSource is required when creating a multi-image processing application. You can either utilize ready-made image sources such as FileFetcher and DirectoryFetcher, or customize your own image source based on the base class ImageSourceAdapter.

First, you need to import the additional required classes:

import com.dynamsoft.core.basic_structures.FileImageTag; import com.dynamsoft.core.basic_structures.ImageTag; import com.dynamsoft.cvr.*; import com.dynamsoft.utility.DirectoryFetcher; import com.dynamsoft.utility.UtilityException; 

In this sample, we will use the DirectoryFetcher to retrieve images from a local directory.

DirectoryFetcher fetcher = new DirectoryFetcher(); fetcher.setDirectory("[THE DIRECTORY THAT HOLDS THE IMAGES]"); 

Please change the [THE DIRECTORY THAT HOLDS THE IMAGES] to full path of the directory holding barcode image files.

Implement a CapturedResultReceiver as the Output Listener

Create a class MyCapturedResultReceiver to extend the CapturedResultReceiver class, and get the barcode results in onDecodedBarcodesReceived callback method.

class MyCapturedResultReceiver extends CapturedResultReceiver { @Override public void onDecodedBarcodesReceived(DecodedBarcodesResult result) { ImageTag tag = result.getOriginalImageTag(); if (tag instanceof FileImageTag) { System.out.println("File: " + ((FileImageTag)tag).getFilePath()); } if (result.getErrorCode() != EnumErrorCode.EC_OK) { System.out.println("Error: " + result.getErrorString()); } else { BarcodeResultItem[] items = result.getItems(); System.out.println("Decoded " + items.length + " barcodes."); for (int index = 0; index < items.length; index++) { BarcodeResultItem item = items[index]; System.out.println("Result " + (index + 1)); System.out.println("Barcode Format: " + item.getFormatString()); System.out.println("Barcode Text: " + item.getText()); } } } } 

Handle Capture Stoppage by Implementing an ImageSource State Listener

Create a class MyImageSourceStateListener to implement the ImageSourceStateListener interface, and call stopCapturing in onImageSourceStateReceived callback method when the state is ISS_EXHAUSTED.

class MyImageSourceStateListener implements ImageSourceStateListener { CaptureVisionRouter cvRouter; public MyImageSourceStateListener(CaptureVisionRouter cvRouter) { this.cvRouter = cvRouter; } @Override public void onImageSourceStateReceived(int state) { if (state == EnumImageSourceState.ISS_EXHAUSTED) { if (cvRouter != null) { cvRouter.stopCapturing(); } } } } 

Register the Input, Output Listener and ImageSource State Listener to the CaptureVisionRouter Instance

try { cvRouter.setInput(fetcher); MyCapturedResultReceiver receiver = new MyCapturedResultReceiver(); cvRouter.addResultReceiver(receiver); MyImageSourceStateListener listener = new MyImageSourceStateListener(cvRouter); cvRouter.addImageSourceStateListener(listener); } catch (CaptureVisionException e) { System.out.println("Error setting up capture vision router: " + e.getMessage()); } 

Start the Capturing Process

Call the method startCapturing() to start processing all the images in the specified folder.

try { cvRouter.startCapturing("", true); } catch (CaptureVisionException e) { if (e.getErrorCode() != EnumErrorCode.EC_OK) { System.out.println("Error: " + e.getErrorCode()); } } 

During the process, the callback method onDecodedBarcodesReceived() is triggered each time processing of an image is finished. After all images are processed, the listener method onImageSourceStateReceived() will be triggered while the image source state is ISS_EXHAUSTED and the process is stopped with the method stopCapturing().

Build and Run the Project Again

Please refer to Build and Run the Project.