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

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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