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修改完善二维码生成，增加内容文字

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This commit is contained in:
jkcdev 2025-05-27 09:04:40 +08:00
parent d88bfd6a48
commit 37050662ec
1 changed files with 38 additions and 3 deletions
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41
ebike-operate/src/main/java/com/cdzy/ebikeoperate/utils/QRGenUtil.java
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@ -4,6 +4,10 @@ import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import net.glxn.qrgen.core.image.ImageType;
import net.glxn.qrgen.javase.QRCode;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Base64;
@ -18,17 +22,48 @@ public class QRGenUtil {
/**
* 生成二维码并返回Base64编码
* <p>增加内容文字
*
* @param content 二维码内容
* @return Base64编码的二维码
*/
public static String generateQRCodeBase64(String content) {
try (ByteArrayOutputStream stream = QRCode.from(content)
.withSize(300, 300) // 尺寸
// 1. 生成基础二维码
try (ByteArrayOutputStream qrStream = QRCode.from(content)
.withSize(300, 300)
.withCharset("UTF-8")
.withErrorCorrection(ErrorCorrectionLevel.H) // 纠错等级（H为最高）
.to(ImageType.PNG) // 输出格式
.stream()) {
// 2. 将二维码转换为 BufferedImage
ByteArrayInputStream inputStream = new ByteArrayInputStream(qrStream.toByteArray());
BufferedImage qrImage = ImageIO.read(inputStream);
// 3. 创建新 BufferedImage 并绘制文字
BufferedImage finalImage = new BufferedImage(
qrImage.getWidth(), qrImage.getHeight()+ 20, // 增加文字区域高度,
BufferedImage.TYPE_INT_ARGB
);
Graphics2D g2d = finalImage.createGraphics();
g2d.drawImage(qrImage, 0, 0, null);
// 设置文字样式
g2d.setFont(new Font("Arial", Font.BOLD, 20));
g2d.setColor(Color.BLACK);
// 计算文字位置（底部居中）
int textWidth = g2d.getFontMetrics().stringWidth(content);
int x = (qrImage.getWidth() - textWidth) / 2;
int y = qrImage.getHeight() - 2; // 底部留白
// 添加文字说明
g2d.drawString(content, x, y);
g2d.dispose();
// 使用 Java 8+ 的 Base64 编码（避免自动换行问题）
ByteArrayOutputStream stream = new ByteArrayOutputStream();
ImageIO.write(finalImage, "PNG", stream);
return Base64.getEncoder().encodeToString(stream.toByteArray());
} catch (Exception e) {
throw new RuntimeException("生成二维码失败", e);
@ -36,7 +71,7 @@ public class QRGenUtil {
}
//public static void main(String[] args) {
// String content = "B726500590095"; // 二维码内容
// String content = "B72650"; // 二维码内容
// String base64 = generateQRCodeBase64(content);
// System.out.println("Base64 二维码: " + base64);
//}