pom依赖

<dependency>

    <groupId>com.google.zxing</groupId>

    <artifactId>core</artifactId>

    <version>3.3.0</version>

</dependency>

谷歌提供的帮助类

import com.google.zxing.LuminanceSource;

import java.awt.*;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

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);

    }

}

二维码工具类

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));

        ImageIO.write(image, FORMAT_NAME, new File(destPath));

    }

    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        return image;

    }

    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);

    }

    // 被注释的方法

    /*

     * 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));

    }

}

测试类

package com.yc.qrcode;

public class QrCodeTest {

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

        // 存放在二维码中的内容

        String text = "1111";

        // 嵌入二维码的图片路径

        String imgPath = "F:/qrCode/dog.jpg";

        // 生成的二维码的路径及名称

        String destPath = "F:/qrCode/qrcode/jam.jpg";

        //生成二维码

        QRCodeUtil.encode(text, imgPath, destPath, true);

        // 解析二维码

        String str = QRCodeUtil.decode(destPath);

        // 打印出解析出的内容

        System.out.println(str);

    }

}

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