java二维码生成-谷歌（Google.zxing）开源二维码生成学习及实例

2022-07-22 11:48:44

java二维码生成-谷歌（Google.zxing）开源二维码生成的实例及介绍

这里我们使用比特矩阵(位矩阵)的QR码编码在缓冲图片上画出二维码

　　实例有以下一个传入参数

　　　　　　OutputStream outputStream, 要存储的文件

　　　　　　String content, 携带信息的内容

　　　　　　int qrCodeSize, 图片大小

　　　　　　String imageFormat 编码

　　步骤：

　　1.设置二维码的纠错级别参数

  //设置二维码纠错级别ＭＡＰ

       Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();

       hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); // 矫错级别

2.创建比特矩阵

 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();

　　3.开始在缓冲图片中画二维码

  BufferedImage image = new BufferedImage(matrixWidth, matrixWidth, 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, j, 1, 1);

                     }

                 }

             }

             ImageIO.write(image, imageFormat, outputStream);

　二维码生成的工具类代码；

 package 。。。;

 import java.awt.Color;

 import java.awt.Graphics2D;

 import java.awt.image.BufferedImage;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.OutputStream;

 import java.util.Hashtable;

 import javax.imageio.ImageIO;

 import com.google.zxing.BarcodeFormat;

 import com.google.zxing.BinaryBitmap;

 import com.google.zxing.EncodeHintType;

 import com.google.zxing.LuminanceSource;

 import com.google.zxing.ReaderException;

 import com.google.zxing.Result;

 import com.google.zxing.WriterException;

 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;

 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;

 /**

  * 二维码生成和读的工具类

  *

  */

 public class QrCodeCreateUtil {

     /**

      * 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<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();

             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 {  

         createQrCode(new FileOutputStream(new File("d:\\qrcode.jpg")),"WE1231238239128sASDASDSADSDWEWWREWRERWSDFDFSDSDF123123123123213123",900,"JPEG");

         readQrCode(new FileInputStream(new File("d:\\qrcode.jpg")));

     }  

 }

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