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
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
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);
二维码生成的工具类代码；
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 }
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