- 1. 添加依赖
- 2. 工具类
- 3. 测试类
1. 添加依赖
com.google.zxing
core
3.3.0
cn.hutool
hutool-all
5.4.1
2. 工具类
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.extra.qrcode.BufferedImageLuminanceSource;
import cn.hutool.extra.qrcode.QrCodeUtil;
import cn.hutool.extra.qrcode.QrConfig;
import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.ruoyi.common.config.RuoYiConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.font.FontDesignMetrics;
import sun.misc.base64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
public class QRCodeUtilEx {
private static Logger logger = LoggerFactory.getLogger(QRCodeUtilEx.class);
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
// 字体大小
private static final int FONT_SIZE = 18;
private static BufferedImage createImage(String content, String bottomDes, String imgPath, boolean needCompress) throws Exception {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
int tempHeight = height;
boolean needDescription = (null != bottomDes && !"".equals(bottomDes));
if (needDescription) {
tempHeight += 30;
}
BufferedImage image = new BufferedImage(width, tempHeight, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
// 插入图片
if (imgPath != null && !"".equals(imgPath)) {
QRCodeUtilEx.insertImage(image, imgPath, needCompress);
}
//添加底部文字
if (needDescription) {
QRCodeUtilEx.addFontImage(image, bottomDes);
}
return image;
}
private static void addFontImage(BufferedImage source, String declareText) {
BufferedImage textImage = strToImage(declareText, QRCODE_SIZE, 50);
Graphics2D graph = source.createGraphics();
//开启文字抗锯齿
graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
int width = textImage.getWidth(null);
int height = textImage.getHeight(null);
Image src = textImage;
graph.drawImage(src, 0, QRCODE_SIZE - 20, width, height, null);
graph.dispose();
}
private static BufferedImage strToImage(String str, int width, int height) {
BufferedImage textImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)textImage.getGraphics();
//开启文字抗锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setBackground(Color.WHITE);
g2.clearRect(0, 0, width, height);
g2.setPaint(Color.BLACK);
FontRenderContext context = g2.getFontRenderContext();
Font font = new Font("微软雅黑", Font.BOLD, FONT_SIZE);
g2.setFont(font);
LineMetrics lineMetrics = font.getLineMetrics(str, context);
FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
float offset = (width - fontMetrics.stringWidth(str)) / 2;
float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;
g2.drawString(str, (int)offset, (int)y);
return textImage;
}
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
File file = new File(imgPath);
if (!file.exists()) {
System.err.println("" + imgPath + " 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graph.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
public static void encode(String content, String bottomDes, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtilEx.createImage(content, bottomDes, imgPath, needCompress);
mkdirs(destPath);
// String file = new Random().nextInt(99999999)+".jpg";
// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}
//获取二维码base64数据
public static String encodeStr(String content, String bottomDes) throws Exception{
BufferedImage image = QRCodeUtilEx.createImage(content, bottomDes, null, false);
ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流
ImageIO.write(image, FORMAT_NAME,baos);//写入流中
byte[] bytes = baos.toByteArray();//转换成字节
base64Encoder encoder = new base64Encoder();
String jpg_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串
jpg_base64 = jpg_base64.replaceAll("n", "").replaceAll("r", "");//删除 rn
//System.out.println("值为："+"data:image/jpg;base64,"+png_base64);
return jpg_base64;
}
public static BufferedImage encode(String content, String bottomDes, String imgPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtilEx.createImage(content, bottomDes, imgPath, needCompress);
return image;
}
public static void mkdirs(String destPath) {
File file = new File(destPath);
// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
public static void encode(String content, String bottomDes, String imgPath, String destPath) throws Exception {
QRCodeUtilEx.encode(content, bottomDes, imgPath, destPath, false);
}
// 被注释的方法
public static void encode(String content, String bottomDes, String destPath) throws Exception {
QRCodeUtilEx.encode(content, bottomDes, null, destPath, false);
}
public static void encode(String content, String bottomDes, String imgPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QRCodeUtilEx.createImage(content, bottomDes, imgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
public static void encode(String content, String bottomDes, OutputStream output) throws Exception {
QRCodeUtilEx.encode(content, bottomDes, null, output, false);
}
public static String decode(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
public static String decode(String path) throws Exception {
return QRCodeUtilEx.decode(new File(path));
}
}
3. 测试类
以下是测试生成二维码的代码：
public class QrcodeTest {
public static void main(String args[]) {
try {
//第一个参数：二维码生成的内容
//第二个参数：底部显示的文字
//第三个参数：图片生成路径
QRCodeUtilEx.encode("360","芜湖众腾人力资源有限公司","D:/ruoyi/uploadPath/upload2021-11-171637139164765.jpg");
} catch (Exception e) {
e.printStackTrace();
}
}
}
最终生成的二维码：
解析二维码使用**String decode(File file)**方法
