84 lines
2.9 KiB
Java
84 lines
2.9 KiB
Java
package com.cdzy.ebikeoperate.utils;
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
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import net.glxn.qrgen.core.image.ImageType;
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import net.glxn.qrgen.javase.QRCode;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.util.Base64;
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/**
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* 二维码生成工具类
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*
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* @author dingchao
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* @date 2025/4/1
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* @modified by:
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*/
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public class QRGenUtil {
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/**
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* 生成二维码并返回Base64编码
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* <p>增加内容文字
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*
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* @param content 二维码内容
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* @param text 文字内容
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* @return Base64编码的二维码
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*/
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public static String generateQRCodeBase64(String content, String text) {
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// 1. 生成基础二维码
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try (ByteArrayOutputStream qrStream = QRCode.from(content)
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.withSize(300, 300)
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.withCharset("UTF-8")
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.withErrorCorrection(ErrorCorrectionLevel.H) // 纠错等级（H为最高）
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.to(ImageType.PNG) // 输出格式
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.stream()) {
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if(text == null || text.isEmpty()){
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return Base64.getEncoder().encodeToString(qrStream.toByteArray());
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}
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// 2. 将二维码转换为 BufferedImage
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ByteArrayInputStream inputStream = new ByteArrayInputStream(qrStream.toByteArray());
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BufferedImage qrImage = ImageIO.read(inputStream);
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// 3. 创建新 BufferedImage 并绘制文字
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BufferedImage finalImage = new BufferedImage(
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qrImage.getWidth(), qrImage.getHeight()+ 20, // 增加文字区域高度,
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BufferedImage.TYPE_INT_ARGB
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);
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Graphics2D g2d = finalImage.createGraphics();
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g2d.drawImage(qrImage, 0, 0, null);
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// 设置文字样式
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g2d.setFont(new Font("Arial", Font.BOLD, 20));
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g2d.setColor(Color.BLACK);
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// 计算文字位置（底部居中）
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int textWidth = g2d.getFontMetrics().stringWidth(text);
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int x = (qrImage.getWidth() - textWidth) / 2;
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int y = qrImage.getHeight() - 2; // 底部留白
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// 添加文字说明
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g2d.drawString(text, x, y);
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g2d.dispose();
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// 使用 Java 8+ 的 Base64 编码（避免自动换行问题）
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ByteArrayOutputStream stream = new ByteArrayOutputStream();
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ImageIO.write(finalImage, "PNG", stream);
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return Base64.getEncoder().encodeToString(stream.toByteArray());
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} catch (Exception e) {
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throw new RuntimeException("生成二维码失败", e);
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}
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}
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//public static void main(String[] args) {
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// String content = "B72650"; // 二维码内容
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// String base64 = generateQRCodeBase64(content);
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// System.out.println("Base64 二维码: " + base64);
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//}
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}
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