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  • 二维码的简单实现

    第一个

    package abc.QRCodeSoft;
    /**
     * Hello world!
     *
     */
    public class App
    {
        public static void main( String[] args )
        {
            //不带图片
    //        String text = "http://www.baidu.com";
    //        try {
    //            QRCodeUtil.encode(text,"","d:/MyWorkDoc",true);
    //        } catch (Exception e) {
    //            // TODO 自动生成的 catch 块
    //            e.printStackTrace();
    //        }
    //        System.out.println( "Hello World!" );
            String text = "https://www.baidu.com/baidu?tn=monline_3_dg&ie=utf-8&wd=%E6%B7%B1%E5%A4%9C%E7%A6%8F%E5%88%A9%E7%BE%A4--%E8%87%AD%E6%B5%81%E6%B0%93";
            try {
                QRCodeUtil.encode(text, "d:/MyWorkDoc/my180.jpg", "d:/MyWorkDoc", true);
            } catch (Exception e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
        }
    }

    第二个

    /*
     * Project: QRCodeSoft
     *
     * File Created at 2017年10月9日
     *
     * Copyright 2016 CMCC Corporation Limited.
     * All rights reserved.
     *
     * This software is the confidential and proprietary information of
     * ZYHY Company. ("Confidential Information").  You shall not
     * disclose such Confidential Information and shall use it only in
     * accordance with the terms of the license.
     */
    package abc.QRCodeSoft;

    /**
     * @Type BufferedImageLuminanceSource.java
     * @Desc
     * @author gy
     * @date 2017年10月9日 上午10:58:53
     * @version
     */
    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);
        }
    }

    /**
     * Revision history
     * -------------------------------------------------------------------------
     *
     * Date Author Note
     * -------------------------------------------------------------------------
     * 2017年10月9日 hp creat
     */

    第三个

    /*
     * Project: QRCodeSoft
     *
     * File Created at 2017年10月9日
     *
     * Copyright 2016 CMCC Corporation Limited.
     * All rights reserved.
     *
     * This software is the confidential and proprietary information of
     * ZYHY Company. ("Confidential Information").  You shall not
     * disclose such Confidential Information and shall use it only in
     * accordance with the terms of the license.
     */
    package abc.QRCodeSoft;

    /**
     * @Type QRCodeUtil.java
     * @Desc
     * @author gy
     * @date 2017年10月9日 上午10:59:04
     * @version
     */
    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);
        }

    }

    /**
     * Revision history
     * -------------------------------------------------------------------------
     *
     * Date Author Note
     * -------------------------------------------------------------------------
     * 2017年10月9日 hp creat
     */
    第四个

    /*
     * Project: QRCodeSoft
     *
     * File Created at 2017年10月18日
     *
     * Copyright 2016 CMCC Corporation Limited.
     * All rights reserved.
     *
     * This software is the confidential and proprietary information of
     * ZYHY Company. ("Confidential Information").  You shall not
     * disclose such Confidential Information and shall use it only in
     * accordance with the terms of the license.
     */
    package abc.QRCodeSoft;

    /**
     * @Type Zhichuandi.java
     * @Desc
     * @author gy
     * @date 2017年10月18日 上午10:36:54
     * @version
     */
    public class Zhichuandi {

        public static void main(String[] args) {
            String strArr = "{{"0":"zhang-san","1":"lisi"}}";
            strArr = strArr.replace("-","");
            System.out.println(strArr+"=============");
        }


    }


    /**
     * Revision history
     * -------------------------------------------------------------------------
     *
     * Date Author Note
     * -------------------------------------------------------------------------
     * 2017年10月18日 hp creat
     */

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  • 原文地址:https://www.cnblogs.com/gyadmin/p/7929035.html
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