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
- ZXing v3.4.0
-
To activate the SDK, you must click here to get a valid license key.
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.
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=true
java -cp target/command-line-1.0-SNAPSHOT-jar-with-dependencies.jar com.java.barcode.App ..\images\AllSupportedBarcodeTypes.png
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=true
java -cp target/gui-1.0-SNAPSHOT-jar-with-dependencies.jar com.java.barcode.App
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:
@RestController
public 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 install
java -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.
Source Code
https://github.com/yushulx/java-jni-barcode-qrcode-reader/tree/main/examples/9.x/zxing_dynamsoft
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