java google.zxing解析二维码工具类

文章 目录

pom
代码
解析用例
生成二维码用例

pom

&lt;dependency&gt;
  	&lt;groupId&gt;com.google.zxing&lt;/groupId&gt;
  	<artifactId&gt;core</artifactId&gt;
  	<version&gt;3.3.0</version&gt;
</dependency>

代码

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.junit.Test;
import org.wltea.analyzer.core.IKSegmenter;
import org.wltea.analyzer.core.Lexeme;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
public class QRCodeUtil extends LuminanceSource {
    private final BufferedImage IMAGE;
    private final int LEFT;
    private final int TOP;
    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;

    public QRCodeUtil(BufferedImage image) {
        this(image, 0, 0, image.getWidth(), image.getHeight());
    }

    public QRCodeUtil(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) &amp; 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 QRCodeUtil(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 QRCodeUtil(rotatedImage, TOP, sourceWidth - (LEFT + width), getHeight(), width);
    }

    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);
        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() &amp;&amp; !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) 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;
        }
        QRCodeUtil source = new QRCodeUtil(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));
    }
    
}

解析用例

QRCodeUtil.decode(File file)  传入二维码图片文件对象
QRCodeUtil.decode(String filePath) 传入二维码图片文件路径

生成 二维码用例

encode(String content, String imgPath, String destPath, boolean needCompress) 
content: 需要写入二维码中的数据
imgPath: 二维码  中嵌入的图片路径 (就是 微信用户二维码中的头像  里面有你的头像的那种二维码)
destPath:生成后的路径
needCompress:是否需要压缩  true
-----------------------------------------------------------------------------------------
encode(String content, String destPath)
content:需要写入二维码中的数据
destPath:生成后的路径
-----------------------------------------------------------------------------------------
encode(String content, String imgPath, boolean needCompress)
返回BufferedImage对象 
content: 需要写入二维码中的数据
imgPath: 二维码  中嵌入的图片路径 (就是 微信用户二维码中的头像  里面有你的头像的那种二维码)
needCompress:是否需要压缩  true
返回的BufferedImage对象并没有将图片写入磁盘 我们可以调用下面的方法  写入磁盘
ImageIO.write(image, FORMAT_NAME, new File(destPath));
image:BufferedImage对象
FORMAT_NAME:图片扩展名 JPG
-----------------------------------------------------------------------------------------
  public static void main(String[] args) throws Exception {
        String content = "孙张熠！！";
//        // 嵌入二维码的图片路径
        String imgPath = "C:\Users\Administrator\Desktop\image\20180923010802416.jpg";
//        // 生成的二维码的路径及名称
        String destPath = "D:\hello.jpg";
//        //生成二维码
        ImageIO.write(QRCodeUtil.encode(content, imgPath, true), "jpg", new File(destPath));


    }