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March 25, 2022 01:34 am GMT

Java Command-Line, GUI and Web Apps for Scanning Barcode and QR Code

In previous article, we discussed how to construct a command-line barcode and QR code scanning application using Java and Dynamsoft Barcode Reader. In this article, we will create more fancy applications, such as a desktop GUI application and a web application. In addition, we will import ZXing SDK to make a comparison with Dynamsoft Barcode Reader.

SDK Version

Maven Configuration

Configure the dependencies in the 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>9.0.0</version>        </dependency>        <dependency>            <groupId>com.google.zxing</groupId>            <artifactId>core</artifactId>            <version>3.4.0</version>          </dependency></dependencies>

Test Image

The test image contains multiple barcode and QR code.

multiple barcode image

A Variety of Java Applications for Scanning Barcode and QR Code

Let's see how ZXing and Dynamsoft Barcode Reader perform in command-line, GUI and web applications.

Command-Line Application

Create a new Maven project:

mvn archetype:generate -DgroupId=com.java.barcode -DartifactId=app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false

Import ZXing and Dynamsoft Barcode Reader:

import com.dynamsoft.dbr.*;import com.google.zxing.BinaryBitmap;import com.google.zxing.MultiFormatReader;import com.google.zxing.NotFoundException;import com.google.zxing.RGBLuminanceSource;import com.google.zxing.Result;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.multi.*;

Decode the image file with ImageIO and BufferedImage:

import java.awt.image.*;import javax.imageio.ImageIO;BufferedImage image = null;try {    image = ImageIO.read(new File(filename));} catch (IOException e) {    System.out.println(e);    return;}

To read multiple barcodes encoded with different barcode symbologies in ZXing, we need to use MultiFormatReader and GenericMultipleBarcodeReader. The BufferedImage needs to be converted to BinaryBitmap:

BinaryBitmap bitmap = null;int[] pixels = image.getRGB(0, 0, image.getWidth(), image.getHeight(), null, 0, image.getWidth());RGBLuminanceSource source = new RGBLuminanceSource(image.getWidth(), image.getHeight(), pixels);bitmap = new BinaryBitmap(new HybridBinarizer(source));MultiFormatReader reader = new MultiFormatReader();  GenericMultipleBarcodeReader multiReader = new GenericMultipleBarcodeReader(reader);try {    Result[] zxingResults = multiReader.decodeMultiple(bitmap);} catch (NotFoundException e) {    e.printStackTrace();}pixels = null;bitmap = null;

In contrast, invoking Dynamsoft Barcode Reader API is much simpler, because it supports BufferedImage as the input parameter:

BarcodeReader br = null;try {    br = new BarcodeReader("LICENSE-KEY");} catch (Exception e) {    System.out.println(e);    return;}TextResult[] results = null;try {    results = br.decodeBufferedImage(image, "");} catch (Exception e) {    System.out.println("decode buffered image: " + e);}

To run the Java program conveniently in terminal, we assemble all dependencies into one jar file by using the maven-assembly-plugin:

<build><plugins>    <plugin>        <artifactId>maven-assembly-plugin</artifactId>        <configuration>            <descriptorRefs>                <descriptorRef>jar-with-dependencies</descriptorRef>            </descriptorRefs>        </configuration>    </plugin></plugins></build>

Build the Maven project and run the application:

mvn clean install assembly:assembly -Dmaven.test.skip=truejava -cp target/command-line-1.0-SNAPSHOT-jar-with-dependencies.jar com.java.barcode.App ..\images\AllSupportedBarcodeTypes.png

java barcode command line

We can see ZXing only returns 8 results, whereas Dynamsoft Barcode Reader returns 18 results.

Desktop GUI Application built with Java Swing

Based on the command-line Java program created above, we can add Swing class to turn the command-line app into a GUI app.

Import the relevant classes:

import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JButton;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JComboBox;import javax.swing.SwingUtilities;import javax.swing.UIManager;import javax.swing.filechooser.FileNameExtensionFilter;import java.awt.BorderLayout;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;

The widgets we need include JTextArea, JButton, JFileChooser and JComboBox:

  • JTextArea: display the results.
  • JButton: trigger the click event.
  • JFileChooser: select an image file from the disk drive.
  • JComboBox: toggle ZXing and Dynamsoft Barcode Reader.

We initialize the layout with all the widgets:

public App() {    super(new BorderLayout());    mFileChooser = new JFileChooser();    FileNameExtensionFilter filter = new FileNameExtensionFilter(            ".png", "png");    mFileChooser.setFileFilter(filter);    mLoad = new JButton("Load File");    mLoad.addActionListener(this);    mSourceList = new JComboBox(new String[]{"ZXing", "Dynamsoft"});    mSourceList.setSelectedIndex(0);    JPanel buttonPanel = new JPanel();     buttonPanel.add(mSourceList);    buttonPanel.add(mLoad);    add(buttonPanel, BorderLayout.PAGE_START);    mTextArea = new JTextArea();    mTextArea.setSize(480, 480);    JScrollPane sp = new JScrollPane(mTextArea);     add(sp, BorderLayout.CENTER);}

As the button click event is triggered, we can load an image for recognizing barcode and QR code:

public void actionPerformed(ActionEvent e) {    int returnVal = mFileChooser.showOpenDialog(App.this);    if (returnVal == JFileChooser.APPROVE_OPTION) {        File file = mFileChooser.getSelectedFile();             String filename = file.toPath().toString();                  if (mSourceList.getSelectedItem().toString().equals("Dynamsoft")) {            TextResult[] results = decodefileDynamsoft(filename);        }        else {            Result[] results = decodefileZXing(filename);        }    } }

Build and run the Java GUI application:

mvn clean install assembly:assembly -Dmaven.test.skip=truejava -cp target/gui-1.0-SNAPSHOT-jar-with-dependencies.jar com.java.barcode.App

java barcode gui

You can switch ZXing and Dynamsoft Barcode Reader by drop-down list.

Web Application built with Java Spring Boot

Spring Boot is used to develop web applications. We can follow the official tutorial to get started with a simple web app.

To quickly test the server-side Java barcode API, we can integrate swagger-ui into the Spring Boot app by adding the following dependencies:

<dependency>    <groupId>org.springdoc</groupId>    <artifactId>springdoc-openapi-core</artifactId>    <version>1.1.45</version>    <exclusions>        <exclusion>            <groupId>io.github.classgraph</groupId>            <artifactId>classgraph</artifactId>        </exclusion>    </exclusions></dependency><dependency>    <groupId>org.springdoc</groupId>    <artifactId>springdoc-openapi-ui</artifactId>    <version>1.1.45</version></dependency>

Afterwards, we create a controller that contains POST mappings for ZXing and Dynamsoft Barcode Reader:

@RestControllerpublic class BarcodeController {    private DynamsoftBarcode mDynamsoftBarcode;    private ZXingBarcode mZXingBarcode;    @Autowired    public BarcodeController(DynamsoftBarcode dynamsoft, ZXingBarcode zxing)     {        mDynamsoftBarcode = dynamsoft;        mZXingBarcode = zxing;    }    @PostMapping(value = "/api/dynamsoft"            , consumes = MediaType.MULTIPART_FORM_DATA_VALUE            , produces = MediaType.APPLICATION_JSON_VALUE)    public BarcodeResponse getDynamsoft(@RequestPart MultipartFile file) throws Exception {        return mDynamsoftBarcode.decode(file.getOriginalFilename(), file.getInputStream());    }    @PostMapping(value = "/api/zxing"            , consumes = MediaType.MULTIPART_FORM_DATA_VALUE            , produces = MediaType.APPLICATION_JSON_VALUE)    public BarcodeResponse getZXing(@RequestPart MultipartFile file) throws Exception {        return mZXingBarcode.decode(file.getOriginalFilename(), file.getInputStream());    }}

Finally, we build and run the Spring Boot app as follows:

mvn clean installjava -jar target/web-1.0-SNAPSHOT.jar

Now, visit http://localhost:8080/swagger-ui.html to test ZXing and Dynamsoft Barcode Reader via POST event.

java barcode spring boot

Source Code

https://github.com/yushulx/java-barcode-command-gui-web


Original Link: https://dev.to/yushulx/java-command-line-gui-and-web-apps-for-scanning-barcode-and-qr-code-h5p

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