使用Google的ZXing库实现编解码二维码

来源：互联网发布：js 检测string 编辑：程序博客网时间：2024/04/29 19:06

慕课网讲解

http://www.imooc.com/learn/531

导入包

1.首先建立一个实现LuminanceSource的类

/** * @FileName: BufferedImageLuminanceSource.java * @Author * @Description: * @Date 2016年7月1日 下午11:43:33 * @CopyRight ZTE Corporation */package com.xsy.qrcode.google.zxing;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);    }}

2.再创建编解码的工具类

/** * @FileName: QRCodeUtil.java * @Author * @Description: * @Date 2016年7月1日 下午11:45:25 * @CopyRight ZTE Corporation */package com.xsy.qrcode.google.zxing;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;    @SuppressWarnings({ "unchecked", "rawtypes" })    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);    }    @SuppressWarnings({ "unchecked", "rawtypes" })    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);    }}

3.测试

/** * @FileName: QRCodeTest.java * @Author * @Description: * @Date 2016年7月1日 下午11:50:04 * @CopyRight ZTE Corporation */package com.xsy.qrcode.google.zxing;import org.junit.Test;public class QRCodeTest{    @Test    /**     *      * @Title: testEncodeQRWithoutLogo     * @Description:不带logo的图像     */    public void testEncodeQRWithoutLogo(){        String text = "这是我的电话号码：15208384257";        try{            QRCodeUtil.encode(text, "", "d:/xsy", true);        }        catch(Exception e){            e.printStackTrace();        }    }    @Test    /**     *      * @Title: testEncodeQRWithLogo     * @Description:带logo的图像     */    public void testEncodeQRWithLogo(){        String text = "这是我的电话号码：15208384257";        try{            QRCodeUtil.encode(text, "d:/xsy/logo.png", "d:/xsy", true);        }        catch(Exception e){            e.printStackTrace();        }    }    @Test    public void testDecodeQR(){        try{            String content = QRCodeUtil.decode("d:/xsy/46647064.jpg");            System.out.println(content);        }        catch(Exception e){            e.printStackTrace();        }    }}

可以生成不带和带logo的二维码图片，并且可以和上一篇文章中的QRCode生成的二维码图片交叉编解码。

可以在网页中直接使用jQuery-qrcode来生成二维码

https://github.com/jeromeetienne/jquery-qrcode

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