zxing生成和解析带logo二维码

首先我们引入相关jar包：

<!-- 二维码 --><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.3.0</version></dependency><dependency><groupId>net.glxn</groupId><artifactId>qrgen</artifactId><version>1.4</version></dependency><!-- servlet --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version></dependency>

编写工具类QRCodeUtil：

package com.example.qrcode.util;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.Binarizer;import com.google.zxing.BinaryBitmap;import com.google.zxing.EncodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.NotFoundException;import com.google.zxing.Result;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/** * 二维码生成和解析工具类 *  * @author Administrator * */public class QRCodeUtil {// 二维码颜色private static final int BLACK = 0xFF000000;// 二维码颜色private static final int WHITE = 0xFFFFFFFF;// 二维码图片格式private static final List<String> IMAGE_TYPE = new ArrayList<String>();static {IMAGE_TYPE.add("jpg");IMAGE_TYPE.add("png");}/** * zxing方式生成二维码 * 注意： * 1,文本生成二维码的方法独立出来,返回image流的形式,可以输出到页面 * 2,设置容错率为最高,一般容错率越高,图片越不清晰,但是只有设置高一点才能兼容logo图片 * 3,logo图片默认占二维码图片的20%,设置太大会导致无法解析  * @param content 二维码包含的内容，文本或网址"Hello World" * @param path 二维码图片目录"C:/Users/Administrator/Desktop/QRcode2/b.jpg" * @param size 二维码图片尺寸 null or your size * @param logoPath 插入图片目录 */public static boolean zxingCodeCreate(String content, String path, Integer size,String logoPath) {try {String imageType = path.substring(path.lastIndexOf(".") + 1).toLowerCase();if (!IMAGE_TYPE.contains(imageType)) {return false;}//获取二维码流的形式，写入到目录文件中BufferedImage image = getBufferedImage(content,size,logoPath);File file = new File(path);if (!file.exists()) {file.mkdirs();}ImageIO.write(image, imageType, file);return true;} catch (IOException e) {e.printStackTrace();return false;}}/** * 二维码流的形式，包含文本内容 * @param content 二维码文本内容 * @param size 二维码尺寸 * @return */public static BufferedImage getBufferedImage (String content,Integer size,String logoPath) {if (size == null || size <= 0) {size = 250;}BufferedImage image = null;try {// 设置编码字符集Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();//设置编码hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");//设置容错率最高hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);          hints.put(EncodeHintType.MARGIN, 1);// 1、生成二维码MultiFormatWriter multiFormatWriter = new MultiFormatWriter();BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, size, size, hints);// 2、获取二维码宽高int codeWidth = bitMatrix.getWidth();int codeHeight = bitMatrix.getHeight();// 3、将二维码放入缓冲流image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB);for (int i = 0; i < codeWidth; i++) {for (int j = 0; j < codeHeight; j++) {// 4、循环将二维码内容定入图片image.setRGB(i, j, bitMatrix.get(i, j) ? BLACK : WHITE);}}//判断是否写入logo图片if (logoPath != null && !"".equals(logoPath)) {File logoPic = new File(logoPath);if (logoPic.exists()) {Graphics2D g = image.createGraphics();BufferedImage logo = ImageIO.read(logoPic);int widthLogo = logo.getWidth(null) > image.getWidth() * 2 / 10 ? (image.getWidth() * 2 / 10) : logo.getWidth(null);int heightLogo = logo.getHeight(null) > image.getHeight() * 2 / 10 ? (image.getHeight() * 2 / 10) : logo.getHeight(null);int x = (image.getWidth() - widthLogo) / 2; int y = (image.getHeight() - heightLogo) / 2;// 开始绘制图片g.drawImage(logo, x, y, widthLogo, heightLogo, null);g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);//边框宽度g.setStroke(new BasicStroke(2));//边框颜色g.setColor(Color.WHITE);g.drawRect(x, y, widthLogo, heightLogo);g.dispose();logo.flush();image.flush();}}} catch (WriterException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return image;}/** * 给二维码图片添加Logo *  * @param qrPic 二维码图片 * @param logoPic logo图片 * @param path 合成后的图片存储目录 */public static boolean zxingCodeCreate(File qrPic, File logoPic,String path) {try {String imageType = path.substring(path.lastIndexOf(".") + 1).toLowerCase();if (!IMAGE_TYPE.contains(imageType)) {return false;}if (!qrPic.isFile() && !logoPic.isFile()) {return false;}/** * 读取二维码图片，并构建绘图对象 */BufferedImage image = ImageIO.read(qrPic);Graphics2D g = image.createGraphics();/** * 读取Logo图片 */BufferedImage logo = ImageIO.read(logoPic);/** * 设置logo的大小,最多20%0 */int widthLogo = logo.getWidth(null) > image.getWidth() * 2 / 10 ? (image.getWidth() * 2 / 10) : logo.getWidth(null);int heightLogo = logo.getHeight(null) > image.getHeight() * 2 / 10 ? (image.getHeight() * 2 / 10) : logo.getHeight(null);// 计算图片放置位置，默认在中间int x = (image.getWidth() - widthLogo) / 2; int y = (image.getHeight() - heightLogo) / 2;// 开始绘制图片g.drawImage(logo, x, y, widthLogo, heightLogo, null);g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);//边框宽度g.setStroke(new BasicStroke(2));//边框颜色g.setColor(Color.WHITE);g.drawRect(x, y, widthLogo, heightLogo);g.dispose();logo.flush();image.flush();File newFile = new File(path);if (!newFile.exists()) {newFile.mkdirs();}ImageIO.write(image, imageType,newFile);return true;} catch (Exception e) {e.printStackTrace();return false;}}/** * zxing方式生成二维码的解析方法 * @param path 二维码图片目录 * @return */@SuppressWarnings({ "rawtypes", "unchecked" })public static Result zxingCodeAnalyze(String path) {try {MultiFormatReader formatReader = new MultiFormatReader();File file = new File(path);if (file.exists()) {BufferedImage image = ImageIO.read(file);LuminanceSource source = new BufferedImageLuminanceSource(image);Binarizer binarizer = new HybridBinarizer(source);BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);Map hints = new HashMap();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");Result result = formatReader.decode(binaryBitmap, hints);return result;}} catch (IOException e) {e.printStackTrace();} catch (NotFoundException e) {e.printStackTrace();}return null;}public static void main(String[] args) {QRCodeUtil.zxingCodeCreate("我爱生煎包", "C:/Users/Administrator/Desktop/QRcode/aaa.jpg", null,"C:/Users/Administrator/Desktop/QRcode/aa.png");Result result = QRCodeUtil.zxingCodeAnalyze("C:/Users/Administrator/Desktop/QRcode/aaa.jpg");System.out.println(result.toString());}}

启动main函数，可以看到已成功生成二维码图片aaa.jpg，如下：

下面我们实现在线生成二维码功能：

首先编写servlet java类：

package com.example.servlet;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.example.qrcode.util.QRCodeUtil;/** * 使用servlet3.0提供的注解 * @author Administrator * */@WebServlet(urlPatterns="/qrcode/servlet")public class QRcodeServlet extends HttpServlet{private static final long serialVersionUID = 6834622481464809081L;protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {resp.setCharacterEncoding("utf-8");//生成二维码图片BufferedImage bufImage = QRCodeUtil.getBufferedImage("网页版二维码", null,"C:/Users/Administrator/Desktop/QRcode/aa.png");//直接打开图片resp.setContentType("image/jpg");//直接下载图片//resp.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("cc.jpg", "UTF-8"));//将图片写出到浏览器OutputStream out = resp.getOutputStream();ImageIO.write(bufImage, "jpg", out);out.close();}}

启动服务测试访问：http://localhost:8088/qrCodeDemo/qrcode/servlet