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java 二维码中间怎么加logo

admin
后端开发
2025-09-02
6

Java中，生成二维码并添加logo通常使用第三方库如ZXing。

Java中生成二维码并在中间添加Logo,可以使用一些开源的库，如ZXing和QRCode-Monkey等，下面是一个详细的步骤指南，介绍如何使用这些库来实现这个功能。

引入必要的库

你需要在你的项目中引入ZXing库,你可以通过Maven或Gradle来添加依赖。

java 二维码中间怎么加logo 第1张

Maven:

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.4.1</version>
</dependency>

Gradle:

implementation 'com.google.zxing:core:3.4.1'
implementation 'com.google.zxing:javase:3.4.1'

生成二维码

使用ZXing库生成二维码非常简单,以下是一个生成二维码的示例代码：

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class QRCodeGenerator {
    public static void main(String[] args) {
        String text = "https://www.example.com";
        int width = 300;
        int height = 300;
        String filePath = "qrcode.png";
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        try {
            BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
            BufferedImage qrImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
            ImageIO.write(qrImage, "PNG", new File(filePath));
            System.out.println("QR Code generated successfully!");
        } catch (WriterException | IOException e) {
            e.printStackTrace();
        }
    }
}

在二维码中间添加Logo

为了在二维码中间添加Logo,我们需要将Logo图像与生成的二维码图像进行合成，以下是实现这一功能的代码：

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import javax.imageio.ImageIO;
import java.awt.;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class QRCodeWithLogo {
    public static void main(String[] args) {
        String text = "https://www.example.com";
        int width = 300;
        int height = 300;
        String filePath = "qrcode_with_logo.png";
        String logoPath = "logo.png"; // Logo图片路径
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        try {
            BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
            BufferedImage qrImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
            // 读取Logo图片
            BufferedImage logoImage = ImageIO.read(new File(logoPath));
            // 计算Logo在二维码中的位置
            int logoWidth = logoImage.getWidth();
            int logoHeight = logoImage.getHeight();
            int x = (width logoWidth) / 2;
            int y = (height logoHeight) / 2;
            // 创建一个新的BufferedImage，将二维码和Logo合成
            BufferedImage combinedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g = combinedImage.createGraphics();
            g.drawImage(qrImage, 0, 0, null);
            g.drawImage(logoImage, x, y, null);
            g.dispose();
            // 保存合成后的图片
            ImageIO.write(combinedImage, "PNG", new File(filePath));
            System.out.println("QR Code with Logo generated successfully!");
        } catch (WriterException | IOException e) {
            e.printStackTrace();
        }
    }
}