Java借助Zxing生成二维码详解编程语言

1.1 将Zxing-core.jar 包加入到classpath下。

1.2; 二维码的生成需要借助MatrixToImageWriter类，该类是由Google提供的，可以将该类拷贝到源码中，这里我将该类的源码贴上，可以直接使用。

import com.google.zxing.common.BitMatrix; 

 import javax.imageio.ImageIO; 

 import java.io.File; 

 import java.io.OutputStream; 

 import java.io.IOException; 

 import java.awt.image.BufferedImage; 

 public final class MatrixToImageWriter { 

 private static final int BLACK = 0xFF000000; 

 private static final int WHITE = 0xFFFFFFFF; 

 private MatrixToImageWriter() {} 

 public static BufferedImage toBufferedImage(BitMatrix matrix) { 

 int width = matrix.getWidth(); 

 int height = matrix.getHeight(); 

 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 

 for (int x = 0; x width; x++) { 

 for (int y = 0; y height; y++) { 

 image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); 

 return image; 

 public static void writeToFile(BitMatrix matrix, String format, File file) 

 throws IOException { 

 BufferedImage image = toBufferedImage(matrix); 

 if (!ImageIO.write(image, format, file)) { 

 throw new IOException("Could not write an image of format " + format + " to " + file); 

 public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) 

 throws IOException { 

 BufferedImage image = toBufferedImage(matrix); 

 if (!ImageIO.write(image, format, stream)) { 

 throw new IOException("Could not write an image of format " + format); 

1.3 编写生成二维码的实现代码

try { 

 String content = "120605181003;http://www.cnblogs.com/jtmjx"; 

 String path = "C:/Users/Administrator/Desktop/testImage"; 

 MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); 

 Map hints = new HashMap(); 

 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); 

 BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints); 

 File file1 = new File(path,"餐巾纸.jpg"); 

 MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1); 

 } catch (Exception e) { 

 e.printStackTrace(); 

现在运行后即可生成一张二维码图片，是不是很简单啊？ 接下来我们看看如何解析二维码

2、二维码的解析

2.1 将Zxing-core.jar 包加入到classpath下。

2.2 和生成一样，我们需要一个辅助类（ BufferedImageLuminanceSource），同样该类Google也提供了，这里我同样将该类的源码贴出来，可以直接拷贝使用个，省去查找的麻烦

BufferedImageLuminanceSource 

 import com.google.zxing.LuminanceSource; 

 import java.awt.Graphics2D; 

 import java.awt.geom.AffineTransform; 

 import java.awt.image.BufferedImage; 

 public final class BufferedImageLuminanceSource extends LuminanceSource { 

 private final BufferedImage image; 

 private final int left; 

 private final int top; 

 public BufferedImageLuminanceSource(BufferedImage image) { 

 this(image, 0, 0, image.getWidth(), image.getHeight()); 

 public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) { 

 super(width, height); 

 int sourceWidth = image.getWidth(); 

 int sourceHeight = image.getHeight(); 

 if (left + width sourceWidth || top + height sourceHeight) { 

 throw new IllegalArgumentException("Crop rectangle does not fit within image data."); 

 for (int y = top; y top + height; y++) { 

 for (int x = left; x left + width; x++) { 

 if ((image.getRGB(x, y) 0xFF000000) == 0) { 

 image.setRGB(x, y, 0xFFFFFFFF); // = white 

 this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY); 

 this.image.getGraphics().drawImage(image, 0, 0, null); 

 this.left = left; 

 this.top = top; 

 @Override 

 public byte[] getRow(int y, byte[] row) { 

 if (y 0 || y = getHeight()) { 

 throw new IllegalArgumentException("Requested row is outside the image: " + y); 

 int width = getWidth(); 

 if (row == null || row.length width) { 

 row = new byte[width]; 

 image.getRaster().getDataElements(left, top + y, width, 1, row); 

 return row; 

 @Override 

 public byte[] getMatrix() { 

 int width = getWidth(); 

 int height = getHeight(); 

 int area = width * height; 

 byte[] matrix = new byte[area]; 

 image.getRaster().getDataElements(left, top, width, height, matrix); 

 return matrix; 

 @Override 

 public boolean isCropSupported() { 

 return true; 

 @Override 

 public LuminanceSource crop(int left, int top, int width, int height) { 

 return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); 

 @Override 

 public boolean isRotateSupported() { 

 return true; 

 @Override 

 public LuminanceSource rotateCounterClockwise() { 

 int sourceWidth = image.getWidth(); 

 int sourceHeight = image.getHeight(); 

 AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth); 

 BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY); 

 Graphics2D g = rotatedImage.createGraphics(); 

 g.drawImage(image, transform, null); 

 g.dispose(); 

 int width = getWidth(); 

 return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); 

 }

2.3 编写解析二维码的实现代码

 try { 

 MultiFormatReader formatReader = new MultiFormatReader(); 

 String filePath = "C:/Users/Administrator/Desktop/testImage/test.jpg"; 

 File file = new File(filePath); 

 BufferedImage image = ImageIO.read(file);; 

 LuminanceSource source = new BufferedImageLuminanceSource(image); 

 Binarizer binarizer = new HybridBinarizer(source); 

 BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer); 

 Map hints = new HashMap(); 

 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); 

 Result result = formatReader.decode(binaryBitmap,hints); 

 System.out.println("result = "+ result.toString()); 

 System.out.println("resultFormat = "+ result.getBarcodeFormat()); 

 System.out.println("resultText = "+ result.getText()); 

 } catch (Exception e) { 

 e.printStackTrace(); 

现在运行后可以看到控制台打印出了二维码的内容。

到此为止，利用Zxing生成和解析二维码就讲述演示完毕

原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/10802.html