使用谷歌的开源包ZXing

 

maven引入如下两个包即可

     
        	
      
       com.google.zxing
       	
      
       core
       	
      
       3.3.0
      
     
     	
      
       com.google.zxing
      	
      
       javase
      	
      
       3.0.0
      
     

　　

 

1、工具类

package com.unicom.zxing;import com.google.zxing.*;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.QRCodeReader;import com.google.zxing.qrcode.QRCodeWriter;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;import java.util.Hashtable;/** * 二维码生成和读的工具类 * */public class ZXingUtil {    /**     * 生成包含字符串信息的二维码图片     * @param outputStream 文件输出流路径     * @param content 二维码携带信息     * @param qrCodeSize 二维码图片大小     * @param imageFormat 二维码的格式     * @throws WriterException     * @throws IOException     */    public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{        //设置二维码纠错级别ＭＡＰ        Hashtable
     
       hintMap = new Hashtable
      
       ();        hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别        QRCodeWriter qrCodeWriter = new QRCodeWriter();        //创建比特矩阵(位矩阵)的QR码编码的字符串        BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);        // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)        int matrixWidth = byteMatrix.getWidth();        BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);        image.createGraphics();        Graphics2D graphics = (Graphics2D) image.getGraphics();        graphics.setColor(Color.WHITE);        graphics.fillRect(0, 0, matrixWidth, matrixWidth);        // 使用比特矩阵画并保存图像        graphics.setColor(Color.BLACK);        for (int i = 0; i < matrixWidth; i++){            for (int j = 0; j < matrixWidth; j++){                if (byteMatrix.get(i, j)){                    graphics.fillRect(i-100, j-100, 1, 1);                }            }        }        return ImageIO.write(image, imageFormat, outputStream);    }    /**     * 读二维码并输出携带的信息     */    public static void readQrCode(InputStream inputStream) throws IOException{        //从输入流中获取字符串信息        BufferedImage image = ImageIO.read(inputStream);        //将图像转换为二进制位图源        LuminanceSource source = new BufferedImageLuminanceSource(image);        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));        QRCodeReader reader = new QRCodeReader();        Result result = null ;        try {            result = reader.decode(bitmap);        } catch (ReaderException e) {            e.printStackTrace();        }        System.out.println(result.getText());    }    /**     * 测试代码     * @throws WriterException     */    public static void main(String[] args) throws IOException, WriterException {        //生成二维码到E盘        createQrCode(new FileOutputStream(new File("E:\\test.jpg")),"https://www.baidu.com/",900,"JPEG");        //下面是读取二维码内容        readQrCode(new FileInputStream(new File("E:\\test.jpg")));    }}
      
     

 

直接运行Main方法，即可在E盘生成二维码

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