JAVA生成二维码图片和解析二维码图片内容代码实例

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pom文件引入google 二维码工具包依赖

       <!-- 二维码 -->
		<dependency>
			<groupId>com.google.zxing</groupId>
			<artifactId>core</artifactId>
			<version>3.3.0</version>
		</dependency>

java生成二维码图片和解析二维码图片内容代码

import cn.hutool.extra.qrcode.BufferedImageLuminanceSource;
import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.tarzan.reptile.utils.SmartBeanUtil;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

public class QrCodeUtil {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    //视频保存目录
    private static final String qrCodeSavePath = "d:/二维码/";

    public static void main(String[] args) {
        String text = "https://www.baidu.com/";
        try {
            //生成二维码图片
            String pathName = generateQRCode(text);
            System.out.println("生成二维码的图片存放路径： " + pathName);
            //解析二维码图片
            String content = parseQRCode(pathName);
            System.out.println("解析内容为： " + content);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成二维码图片
     *
     * @param text
     * @return
     */
    public static String generateQRCode(String text) throws Exception {
        return generateQRCode(text, 300, 300, "jpg", qrCodeSavePath + SmartBeanUtil.genUUID() + ".jpg");
    }

    /**
     * 解析指定路径下的二维码图片
     *
     * @param filePath
     * @return
     */
    private static String parseQRCode(String filePath) {
        String content = "";
        try {
            File file = new File(filePath);
            BufferedImage image = ImageIO.read(file);
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            MultiFormatReader formatReader = new MultiFormatReader();
            Result result = formatReader.decode(binaryBitmap, hints);
            //设置返回值
            content = result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return content;
    }


    /**
     * 根据内容，生成指定宽高、指定格式的二维码图片
     *
     * @param text   内容
     * @param width  宽
     * @param height 高
     * @param format 图片格式
     * @return 生成的二维码图片路径
     * @throws Exception
     */
    public static String generateQRCode(String text, int width, int height, String format, String pathName) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        File outputFile = new File(pathName);
        if (!outputFile.exists()) {
            outputFile.mkdirs();
        }
        writeToFile(bitMatrix, format, outputFile);
        return pathName;
    }

    //输出为文件
    public static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("文件写入异常");
        }
    }

    //输出为流
    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("文件写入异常");
        }
    }

    //缓冲图片
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }


}

控制台输出

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生成二维码图片效果

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