Java二维码与条形码生成库详解：ZXing、QRGen与Barcode4J实战代码示例

import com.google.zxing.BarcodeFormat;
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 java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
 
public class QRCodeGenerator {
 
    public static void main(String[] args) {
        String text = "Hello, World!";
        int width = 200;
        int height = 200;
        String filePath = "./generated_qrcode.png";
 
        try {
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);
            Path path = FileSystems.getDefault().getPath(filePath);
            MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
            System.out.println("QR Code generated successfully at " + filePath);
        } catch (WriterException | IOException e) {
            System.out.println("Error generating QR Code: " + e.getMessage());
        }
    }
}

这段代码使用了ZXing库来生成一个二维码图像，并将其保存到指定路径。首先创建了一个QRCodeWriter对象，然后调用encode方法生成二维码的位矩阵BitMatrix，最后使用MatrixToImageWriter.writeToPath方法将位矩阵转换为图像并保存到文件系统。