java怎么生成qrCode

本篇内容主要讲解"java怎么生成qrCode"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"java怎么生成qrCode"吧!

参数类：

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/** *  */public class QRCodeParams {        private String txt; // 二维码内容        private String qrCodeUrl; // 二维码网络路径        private String logoPath; // logo图片        private Integer width = 300; // 二维码宽度        private Integer height = 300; // 二维码高度        private Integer onColor = 0xFF000000; // 前景色        private Integer offColor = 0xFFFFFFFF; // 背景色        private Integer margin = 1; // 白边大小，取值范围0~4        private ErrorCorrectionLevel level = ErrorCorrectionLevel.L; // 二维码容错率        public String getTxt() {                return txt;        }        public void setTxt(String txt) {                this.txt = txt;        }        public Integer getWidth() {                return width;        }        public void setWidth(Integer width) {                this.width = width;        }        public Integer getHeight() {                return height;        }        public void setHeight(Integer height) {                this.height = height;        }        public String getQrCodeUrl() {                return qrCodeUrl;        }        public void setQrCodeUrl(String qrCodeUrl) {                this.qrCodeUrl = qrCodeUrl;        }        public String getLogoPath() {                return logoPath;        }        public void setLogoPath(String logoPath) {                this.logoPath = logoPath;        }        public Integer getOnColor() {                return onColor;        }        public void setOnColor(Integer onColor) {                this.onColor = onColor;        }        public Integer getOffColor() {                return offColor;        }        public void setOffColor(Integer offColor) {                this.offColor = offColor;        }        public ErrorCorrectionLevel getLevel() {                return level;        }        public void setLevel(ErrorCorrectionLevel level) {                this.level = level;        }        public Integer getMargin() {                return margin;        }        public void setMargin(Integer margin) {                this.margin = margin;        }}

图标配置类：

import java.awt.BasicStroke;import java.awt.Color;import java.awt.Graphics2D;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.net.URL;import java.net.URLConnection;import javax.imageio.ImageIO;/** */public class QRLogoConfig {        /**         * 设置 logo         *          * @param matrixImage         *            源二维码图片         * @return 返回带有logo的二维码图片         * @throws IOException         * @author Administrator sangwenhao         */        public BufferedImage LogoMatrix(BufferedImage matrixImage, String logoPath)                        throws IOException {                /**                 * 读取二维码图片，并构建绘图对象                 */                Graphics2D g2 = matrixImage.createGraphics();                int matrixWidth = matrixImage.getWidth();                int matrixHeigh = matrixImage.getHeight();                int num = logoPath.indexOf('/', 8);                String u = logoPath.substring(0, num);                URL url = new URL(logoPath);                URLConnection connection = url.openConnection();                connection.setDoOutput(true);                connection.setRequestProperty("referer", u);                /**                 * 读取Logo图片                 */                BufferedImage logo = ImageIO.read(connection.getInputStream());                // 开始绘制图片                g2.drawImage(logo, matrixWidth / 5 * 2, matrixHeigh / 5 * 2,                                matrixWidth / 5, matrixHeigh / 5, null);// 绘制                BasicStroke stroke = new BasicStroke(5, BasicStroke.CAP_ROUND,                                BasicStroke.JOIN_ROUND);                g2.setStroke(stroke);// 设置笔画对象                // 指定弧度的圆角矩形                RoundRectangle2D.Float round = new RoundRectangle2D.Float(                                matrixWidth / 5 * 2, matrixHeigh / 5 * 2, matrixWidth / 5,                                matrixHeigh / 5, 20, 20);                g2.setColor(Color.white);                g2.draw(round);// 绘制圆弧矩形                // 设置logo 有一道灰色边框                BasicStroke stroke2 = new BasicStroke(1, BasicStroke.CAP_ROUND,                                BasicStroke.JOIN_ROUND);                g2.setStroke(stroke2);// 设置笔画对象                RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(                                matrixWidth / 5 * 2 + 2, matrixHeigh / 5 * 2 + 2,                                matrixWidth / 5 - 4, matrixHeigh / 5 - 4, 20, 20);                g2.setColor(new Color(128, 128, 128));                g2.draw(round2);// 绘制圆弧矩形                g2.dispose();                matrixImage.flush();                return matrixImage;        }}

异常类：

/** *  */public class QRParamsException extends Exception {        private static final long serialVersionUID = 8837582301762730656L;        public QRParamsException() {        } // 用来创建无参数对象        public QRParamsException(String message) { // 用来创建指定参数对象                super(message); // 调用超类构造器        }}

工具处理类：

import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.IOException;import java.util.Hashtable;import javax.imageio.ImageIO;import org.apache.commons.lang3.StringUtils;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;/** *  */public class QRCodeUtil {        private static int width = 500; // 二维码宽度        private static int height = 500; // 二维码高度        private static int onColor = 0xFF000000; // 前景色        private static int offColor = 0xFFFFFFFF; // 背景色        private static int margin = 1; // 白边大小，取值范围0~4        private static ErrorCorrectionLevel level = ErrorCorrectionLevel.L; // 二维码容错率        /**         * 生成二维码         *          * @param params         *            QRCodeParams属性：txt、fileName、filePath不得为空；         * @throws QRParamsException         */        public static ByteArrayOutputStream generateQRImage(QRCodeParams params)                        throws QRParamsException {                if (params == null || params.getTxt() == null) {                        throw new QRParamsException("参数错误");                }                try {                        initData(params);                        String txt = params.getTxt();                        if (StringUtils.isNoneBlank(params.getLogoPath())) {                                return generateQRImage(txt, params.getLogoPath());                        } else {                                return generateQRImage(txt);                        }                } catch (Exception e) {                        e.printStackTrace();                }                return null;        }        /**         * 生成二维码         *          * @param txt         *            //二维码内容         */        public static ByteArrayOutputStream generateQRImage(String txt) {                Hashtable hints = new Hashtable();                // 指定纠错等级                hints.put(EncodeHintType.ERROR_CORRECTION, level);                // 指定编码格式                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");                hints.put(EncodeHintType.MARGIN, margin);                try {                        BitMatrix bitMatrix = new MultiFormatWriter().encode(txt,                                        BarcodeFormat.QR_CODE, width, height, hints);                        BufferedImage image = toBufferedImage(bitMatrix);                        ByteArrayOutputStream out = new ByteArrayOutputStream();                        try {                                ImageIO.write(image, "PNG", out);                                return out;                        } catch (IOException e) {                                e.printStackTrace();                        }                } catch (Exception e) {                        e.printStackTrace();                }                return null;        }        /**         * 生成带logo的二维码图片         *          * @param txt         *            //二维码内容         * @param logoPath         *            //logo绝对物理路径         * @throws Exception         */        public static ByteArrayOutputStream generateQRImage(String txt,                        String logoPath) throws Exception {                Hashtable hints = new Hashtable();                // 指定纠错等级,纠错级别（L 7%、M 15%、Q 25%、H 30%）                hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);                hints.put(EncodeHintType.CHARACTER_SET, "utf-8");                hints.put(EncodeHintType.ERROR_CORRECTION, level);                hints.put(EncodeHintType.MARGIN, margin);                BitMatrix bitMatrix = new MultiFormatWriter().encode(txt,                                BarcodeFormat.QR_CODE, width, height, hints);                return writeToFile(bitMatrix, logoPath);        }        /**         *          * @param matrix         *            二维码矩阵相关         * @param format         *            二维码图片格式         * @param file         *            二维码图片文件         * @param logoPath         *            logo路径         * @throws IOException         */        public static void writeToFile(BitMatrix matrix, String format, File file,                        String logoPath) throws IOException {                BufferedImage image = toBufferedImage(matrix);                Graphics2D gs = image.createGraphics();                int ratioWidth = image.getWidth() * 2 / 10;                int ratioHeight = image.getHeight() * 2 / 10;                // 载入logo                Image img = ImageIO.read(new File(logoPath));                int logoWidth = img.getWidth(null) > ratioWidth ? ratioWidth : img                                .getWidth(null);                int logoHeight = img.getHeight(null) > ratioHeight ? ratioHeight : img                                .getHeight(null);                int x = (image.getWidth() - logoWidth) / 2;                int y = (image.getHeight() - logoHeight) / 2;                gs.drawImage(img, x, y, logoWidth, logoHeight, null);                gs.setColor(Color.black);                gs.setBackground(Color.WHITE);                gs.dispose();                img.flush();                if (!ImageIO.write(image, format, file)) {                        throw new IOException("Could not write an image of format "                                        + format + " to " + file);                }        }        public static ByteArrayOutputStream writeToFile(BitMatrix matrix,                        String logoPath) throws IOException {                BufferedImage image = toBufferedImage(matrix);                // 设置logo图标                QRLogoConfig logoConfig = new QRLogoConfig();                image = logoConfig.LogoMatrix(image, logoPath);                ByteArrayOutputStream out = new ByteArrayOutputStream();                try {                        ImageIO.write(image, "PNG", out);                        return out;                } catch (IOException e) {                        e.printStackTrace();                }                return null;        }        public static BufferedImage toBufferedImage(BitMatrix matrix) {                int width = matrix.getWidth();                int height = matrix.getHeight();                BufferedImage image = new BufferedImage(width, height,                                BufferedImage.TYPE_INT_RGB);                for (int x = 0; x < width; x++) {                        for (int y = 0; y < height; y++) {                                image.setRGB(x, y, matrix.get(x, y) ? onColor : offColor);                        }                }                return image;        }        public static BitMatrix deleteWhite(BitMatrix matrix) {                int[] rec = matrix.getEnclosingRectangle();                int resWidth = rec[2] + 1;                int resHeight = rec[3] + 1;                BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);                resMatrix.clear();                for (int i = 0; i < resWidth; i++) {                        for (int j = 0; j < resHeight; j++) {                                if (matrix.get(i + rec[0], j + rec[1]))                                        resMatrix.set(i, j);                        }                }                return resMatrix;        }        private static void initData(QRCodeParams params) {                if (params.getWidth() != null) {                        width = params.getWidth();                }                if (params.getHeight() != null) {                        height = params.getHeight();                }                if (params.getOnColor() != null) {                        onColor = params.getOnColor();                }                if (params.getOffColor() != null) {                        offColor = params.getOffColor();                }                if (params.getLevel() != null) {                        level = params.getLevel();                }        }}

调用：

QRCodeParams qrParams = new QRCodeParams();//            url = "http://192.168.1.2:8086/business";            qrParams.setTxt(url);            qrParams.setWidth(300);            qrParams.setHeight(300);            ByteArrayOutputStream out = QRCodeUtil.generateQRImage(qrParams);            qrCode = this.uploadService.upload(out,IdUtils.id()+".png");

到此，相信大家对"java怎么生成qrCode"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！