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

青旅半醒 2021-06-11 15:10 645阅读 0赞

[http://www.cnblogs.com/lanxiamo/p/6293580.html][http_www.cnblogs.com_lanxiamo_p_6293580.html]

** **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**

1 QRCodeWriter qrCodeWriter = new QRCodeWriter(); 
    2 //创建比特矩阵(位矩阵)的QR码编码的字符串 
    3 BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap); 
    4 // 使BufferedImage勾画QRCode (matrixWidth 是行二维码像素点)
    5 int matrixWidth = byteMatrix.getWidth();

**3.开始在缓冲图片中画二维码**

![复制代码][copycode.gif]

1  BufferedImage image = new BufferedImage(matrixWidth, matrixWidth, BufferedImage.TYPE_INT_RGB);  
     2             image.createGraphics();  
     3             Graphics2D graphics = (Graphics2D) image.getGraphics();  
     4             graphics.setColor(Color.WHITE);  
     5             graphics.fillRect(0, 0, matrixWidth, matrixWidth);  
     6             // 使用比特矩阵画并保存图像
     7             graphics.setColor(Color.BLACK);  
     8             for (int i = 0; i < matrixWidth; i++){
     9                 for (int j = 0; j < matrixWidth; j++){
    10                     if (byteMatrix.get(i, j)){
    11                         graphics.fillRect(i, j, 1, 1);  
    12                     }
    13                 }
    14             }
    15             ImageIO.write(image, imageFormat, outputStream);

![复制代码][copycode.gif]

***二维码生成的工具类代码；***

![复制代码][copycode.gif]

1 package 。。。;
     2 
     3 import java.awt.Color;
     4 import java.awt.Graphics2D;
     5 import java.awt.image.BufferedImage;
     6 import java.io.File;
     7 import java.io.FileInputStream;
     8 import java.io.FileOutputStream;
     9 import java.io.IOException;
    10 import java.io.InputStream;
    11 import java.io.OutputStream;
    12 import java.util.Hashtable;
    13 
    14 import javax.imageio.ImageIO;
    15 
    16 import com.google.zxing.BarcodeFormat;
    17 import com.google.zxing.BinaryBitmap;
    18 import com.google.zxing.EncodeHintType;
    19 import com.google.zxing.LuminanceSource;
    20 import com.google.zxing.ReaderException;
    21 import com.google.zxing.Result;
    22 import com.google.zxing.WriterException;
    23 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    24 import com.google.zxing.common.BitMatrix;
    25 import com.google.zxing.common.HybridBinarizer;
    26 import com.google.zxing.qrcode.QRCodeReader;
    27 import com.google.zxing.qrcode.QRCodeWriter;
    28 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    29 
    30 /**
    31  * 二维码生成和读的工具类
    32  *
    33  */
    34 public class QrCodeCreateUtil {
    35     
    36     /**
    37      * 生成包含字符串信息的二维码图片
    38      * @param outputStream 文件输出流路径
    39      * @param content 二维码携带信息
    40      * @param qrCodeSize 二维码图片大小
    41      * @param imageFormat 二维码的格式
    42      * @throws WriterException 
    43      * @throws IOException 
    44      */
    45     public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{  
    46             //设置二维码纠错级别ＭＡＰ
    47             Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();  
    48             hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别  
    49             QRCodeWriter qrCodeWriter = new QRCodeWriter();  
    50             //创建比特矩阵(位矩阵)的QR码编码的字符串  
    51             BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);  
    52             // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
    53             int matrixWidth = byteMatrix.getWidth();  
    54             BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);  
    55             image.createGraphics();  
    56             Graphics2D graphics = (Graphics2D) image.getGraphics();  
    57             graphics.setColor(Color.WHITE);  
    58             graphics.fillRect(0, 0, matrixWidth, matrixWidth);  
    59             // 使用比特矩阵画并保存图像
    60             graphics.setColor(Color.BLACK);  
    61             for (int i = 0; i < matrixWidth; i++){
    62                 for (int j = 0; j < matrixWidth; j++){
    63                     if (byteMatrix.get(i, j)){
    64                         graphics.fillRect(i-100, j-100, 1, 1);  
    65                     }
    66                 }
    67             }
    68             return ImageIO.write(image, imageFormat, outputStream);  
    69     }  
    70       
    71     /**
    72      * 读二维码并输出携带的信息
    73      */
    74     public static void readQrCode(InputStream inputStream) throws IOException{  
    75         //从输入流中获取字符串信息
    76         BufferedImage image = ImageIO.read(inputStream);  
    77         //将图像转换为二进制位图源
    78         LuminanceSource source = new BufferedImageLuminanceSource(image);  
    79         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));  
    80         QRCodeReader reader = new QRCodeReader();  
    81         Result result = null ;  
    82         try {
    83          result = reader.decode(bitmap);  
    84         } catch (ReaderException e) {
    85             e.printStackTrace();  
    86         }
    87         System.out.println(result.getText());  
    88     }
    89     /**
    90      * 测试代码
    91      * @throws WriterException 
    92      */
    93     public static void main(String[] args) throws IOException, WriterException {  
    94         
    95         createQrCode(new FileOutputStream(new File("d:\\qrcode.jpg")),"WE1231238239128sASDASDSADSDWEWWREWRERWSDFDFSDSDF123123123123213123",900,"JPEG");
    96         readQrCode(new FileInputStream(new File("d:\\qrcode.jpg")));  
    97     }  
    98   
    99 }

![复制代码][copycode.gif]

[http_www.cnblogs.com_lanxiamo_p_6293580.html]: http://www.cnblogs.com/lanxiamo/p/6293580.html
[copycode.gif]: /images/20210527/7e5b3fce29584b88abb341d0f1a9bc89.png