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  • java 生成二维码

    2017-11-15 11:07:12
    java 生成二维码 亲测有效。java 生成二维码 亲测有效。
  • Java生成二维码

    2020-06-03 23:50:48
  • java生成二维码

    2017-12-20 10:51:59
    java生成二维码的demo,可以下载直接运行,并已经测试通过
  • JAVA生成二维码

    2020-08-27 16:47:25
    一步一步教你用java生成二维码 一步一步用 java 设计生成二维码 在物联网的时代,二维码是个很重要的东西了,现在无论什么东西都要搞个二维码标志,唯恐落伍,就差人没有用二维码识别了。也许有...

    http://blog.sina.com.cn/s/blog_5a6efa330102v1lb.html

    一步一步教你用 java 生成二维码

     

     

     

    一步一步用 java 设计生成二维码

    在物联网的时代,二维码是个很重要的东西了,现在无论什么东西都要搞个二维码标志,唯恐落伍,就差人没有用二维码识别了。也许有一天生分证或者户口本都会用二维码识别了。今天心血来潮,看见别人都为自己的博客添加了二维码,我也想搞一个测试一下.

     

    主要用来实现两点:

    1. 生成任意文字的二维码.

    2. 在二维码的中间加入图像.

     

    一、准备工作。

    准备QR二维码3.0 版本的core包和一张jpg图片。

     

    下载QR二维码包。

    首先得下载 zxing.jar 包, 我这里用的是3.0 版本的core包

    下载地址: 现在已经迁移到了github: https://github.com/zxing/zxing/wiki/Getting-Started-Developing,

    当然你也可以从maven仓库下载jar 包: http://central.maven.org/maven2/com/google/zxing/core/

     

     

    二、程序设计

     1、启动eclipse,新建一个java项目,命好项目名(本例取名为QRCodeSoft)。点下一步:

     

    2、导入zxing.jar 包, 我这里用的是3.0 版本的core包:点“添加外部JAR(X)…”。

     

     

     

    3、新建两个类,分别是:

    BufferedImageLuminanceSource.java

    QRCodeUtil.java

    关键代码在于:BufferedImageLuminanceSource.java 和QRCodeUtil.java , 其中测试的main 方法位于 QRCodeUtil.java 中。

    BufferedImageLuminanceSource.java程序代码:

    package qrcodesoft;

    import java.awt.Graphics2D;

    import java.awt.geom.AffineTransform;

    import java.awt.image.BufferedImage;

    import com.google.zxing.LuminanceSource;

    public class BufferedImageLuminanceSource extends LuminanceSource {

        private final BufferedImage image;

        private final int left;

        private final int top;

        public BufferedImageLuminanceSource(BufferedImage image) {

            this(image, 0, 0, image.getWidth(), image.getHeight());

        }

        public BufferedImageLuminanceSource(BufferedImage image, int left,

                int top, int width, int height) {

            super(width, height);

            int sourceWidth = image.getWidth();

            int sourceHeight = image.getHeight();

            if (left + width > sourceWidth || top + height > sourceHeight) {

                throw new IllegalArgumentException(

                        "Crop rectangle does not fit within image data.");

            }

            for (int y = top; y < top + height; y++) {

                for (int x = left; x < left + width; x++) {

                    if ((image.getRGB(x, y) & 0xFF000000) == 0) {

                        image.setRGB(x, y, 0xFFFFFFFF); // = white

                    }

                }

            }

            this.image = new BufferedImage(sourceWidth, sourceHeight,

                    BufferedImage.TYPE_BYTE_GRAY);

            this.image.getGraphics().drawImage(image, 0, 0, null);

            this.left = left;

            this.top = top;

        }

        public byte[] getRow(int y, byte[] row) {

            if (y < 0 || y >= getHeight()) {

                throw new IllegalArgumentException(

                        "Requested row is outside the image: " + y);

            }

            int width = getWidth();

            if (row == null || row.length < width) {

                row = new byte[width];

            }

            image.getRaster().getDataElements(left, top + y, width, 1, row);

            return row;

        }

        public byte[] getMatrix() {

            int width = getWidth();

            int height = getHeight();

            int area = width * height;

            byte[] matrix = new byte[area];

            image.getRaster().getDataElements(left, top, width, height, matrix);

            return matrix;

        }

     

        public boolean isCropSupported() {

            return true;

        }

     

        public LuminanceSource crop(int left, int top, int width, int height) {

            return new BufferedImageLuminanceSource(image, this.left + left,

                    this.top + top, width, height);

        }

     

        public boolean isRotateSupported() {

            return true;

        }

     

        public LuminanceSource rotateCounterClockwise() {

            int sourceWidth = image.getWidth();

            int sourceHeight = image.getHeight();

            AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,

                    0.0, 0.0, sourceWidth);

            BufferedImage rotatedImage = new BufferedImage(sourceHeight,

                    sourceWidth, BufferedImage.TYPE_BYTE_GRAY);

            Graphics2D g = rotatedImage.createGraphics();

            g.drawImage(image, transform, null);

            g.dispose();

            int width = getWidth();

            return new BufferedImageLuminanceSource(rotatedImage, top,

                    sourceWidth - (left + width), getHeight(), width);

        }

    }

    QRCodeUtil.java的程序代码:

    package qrcodesoft;

     

    import java.awt.BasicStroke;

    import java.awt.Graphics;

    import java.awt.Graphics2D;

    import java.awt.Image;

    import java.awt.Shape;

    import java.awt.geom.RoundRectangle2D;

    import java.awt.image.BufferedImage;

    import java.io.File;

    import java.io.OutputStream;

    import java.util.Hashtable;

    import java.util.Random;

    import javax.imageio.ImageIO;

    import com.google.zxing.BarcodeFormat;

    import com.google.zxing.BinaryBitmap;

    import com.google.zxing.DecodeHintType;

    import com.google.zxing.EncodeHintType;

    import com.google.zxing.MultiFormatReader;

    import com.google.zxing.MultiFormatWriter;

    import com.google.zxing.Result;

    import com.google.zxing.common.BitMatrix;

    import com.google.zxing.common.HybridBinarizer;

    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

    public class QRCodeUtil {

        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;

        private static BufferedImage createImage(String content, 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();

            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, bitMatrix.get(x, y) ? 0xFF000000

                            : 0xFFFFFFFF);

                }

            }

            if (imgPath == null || "".equals(imgPath)) {

                return image;

            }

            // 插入图片

            QRCodeUtil.insertImage(image, imgPath, needCompress);

            return image;

        }

     

        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 imgPath, String destPath,

                boolean needCompress) throws Exception {

            BufferedImage image = QRCodeUtil.createImage(content, imgPath,

                    needCompress);

            mkdirs(destPath);

            String file = new Random().nextInt(99999999)+".jpg";

            ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));

        }

     

        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 imgPath, String destPath)

                throws Exception {

            QRCodeUtil.encode(content, imgPath, destPath, false);

        }

       

        public static void encode(String content, String destPath,

                boolean needCompress) throws Exception {

            QRCodeUtil.encode(content, null, destPath, needCompress);

        }

     

        public static void encode(String content, String destPath) throws Exception {

            QRCodeUtil.encode(content, null, destPath, false);

        }

     

        public static void encode(String content, String imgPath,

                OutputStream output, boolean needCompress) throws Exception {

            BufferedImage image = QRCodeUtil.createImage(content, imgPath,

                    needCompress);

            ImageIO.write(image, FORMAT_NAME, output);

        }

     

        public static void encode(String content, OutputStream output)

                throws Exception {

            QRCodeUtil.encode(content, 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 QRCodeUtil.decode(new File(path));

        }

       

       

        public static void main(String[] args) throws Exception {

            String text = "http://www.dans88.com.cn";

            QRCodeUtil.encode(text, "d:/MyWorkDoc/my180.jpg", "d:/MyWorkDoc", true);

        }

     

    }

     

    生成不带logo 的二维码程序代码

     

    public static void main(String[] args) throws Exception {

            String text = "http://www.dans88.com.cn";

            QRCodeUtil.encode(text,"","d:/MyWorkDoc",true);

     

    运行这个测试方法,生成的二维码不带 logo , 样式如下:

     

     

     

    有兴趣可以用手机扫描一下

    生成带logo 的二维码

    logo 可以用自己的头像,或者自己喜欢的一个图片都可以 , 采用如下代码程序代码

     

    public static void main(String[] args) throws Exception {

            String text = "http://www.dans88.com.cn";

            QRCodeUtil.encode(text, "d:/MyWorkDoc/my180.jpg", "d:/MyWorkDoc", true);

        }

    唯一的区别是,在前面的基础上指定了logo 的地址,这里测试都用了c盘的图片文件

     

     

    用手机扫描,能出现要出现的文字,点击就进入自己的网站,看起来还不错, 整个源代码,提供在下载测试:java barcode sample

     

    总结:

     

    1、

    http://central.maven.org/maven2/com/google/zxing/core/3.3.0/

    3、优化:可指定生成二维码图片的名称

     

     

     

     

     

     

    展开全文
  • Java 生成二维码

    2017-04-19 12:28:58
    Java生成二维码工具使用google条码解析库zxing. 功能: 为给定字符串生成二维码 1. 返回BufferImage格式 2. 写入到指定文件中 3. 写入到OutputStream中

    Java生成二维码工具

    使用google条码解析库zxing.
    功能: 为给定字符串生成二维码
    1. 返回BufferImage格式
    2. 写入到指定文件中
    3. 写入到OutputStream中
    代码如下:

    package org.ramer.common.utils;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Hashtable;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.WriterException;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    /**
     *  The QR code util.
     *
     * @author RAMER
     * @date Apr 19, 2017
     */
    public class QRcodeUtil{
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        /**
         * Generate QR code img.
         *
         * @param content the content
         * @param width the width
         * @param height the height
         * @return the buffered image
         */
        public static BufferedImage generateQRcodeImg(String content, Integer width, Integer height) {
            BitMatrix bitMatrix = null;
            Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.MARGIN, 0);
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            try {
                bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            } catch (WriterException e) {
                e.printStackTrace();
                return null;
            }
            int w = bitMatrix.getWidth();
            int h = bitMatrix.getHeight();
            BufferedImage bufferedImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_BGR);
            for (int x = 0; x < w; x++) {
                for (int y = 0; y < h; y++) {
                    bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
                }
            }
            return bufferedImage;
        }
    
        /**
         * Generate QR code file.
         *
         * @param content the content
         * @param width the width
         * @param height the height
         * @param format the format,eg: gif,jpeg
         * @param file the file
         * @return the file   null ,if exec error.
         */
        public static File generateQRcodeFile(String content, Integer width, Integer height, 
            String format, File file) {
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                    return null;
                }
            }
            BufferedImage bufferedImage = generateQRcodeImg(content, width, height);
            try {
                ImageIO.write(bufferedImage, format, file);
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
            return file;
        }
    
        /**
         * Write to stream.
         *
         * @param content the content
         * @param width the width
         * @param height the height
         * @param format the format,eg: gif,jpeg
         * @param outputStream the output stream
         */
        public static void writeToStream(String content, Integer width, Integer height,
            String format,OutputStream outputStream) {
            BufferedImage bufferedImage = generateQRcodeImg(content, width, height);
            try {
                ImageIO.write(bufferedImage, format, outputStream);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
    }

    测试:

    public class QRcodeUtilTest{
    
        @Test
        public void testGenerateQRcodeFile() {
            File file = new File("Z:/Desktop/qrcode-ramer.jpeg");
            QRcodeUtil.generateQRcodeFile("ramer", 80, 80, "jpeg", file);
        }
    
        @Test
        public void testWriteToStream() {
            try (FileOutputStream outputStream = new FileOutputStream(
                new File("Z:/Desktop/qrcode2-ramer.jpeg"))) {
                QRcodeUtil.writeToStream("ramer", 80, 80, "jpeg", outputStream);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    展开全文

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