Java---利用Zing生成二维码、解析二维码

Zxing是一个开源的用Java实现的多种格式的1D/2D条码图像处理库，可以生成、解析二维码。

二维码它就是把一段纯文本用图形样式转换出来了，以便于快速扫描读出

首先，新建一个Java工程，然后导入需要的Zxing jar包，
工程结构如下:

1.二维码生成

1.1将源码中关于二维码生成的类拷贝进来，

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;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);}}
}

1.2在main方法中编写实现二维码生成的方法

private static void generateCode() {try {String content = "http://www.baidu.com";String path = "C:\\Users\\Dong\\Desktop\\testImage";File dir = new File(path);if (!dir.exists()) {dir.mkdir();}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(dir, "url.png");MatrixToImageWriter.writeToFile(bitMatrix, "png", file1);System.out.println("二维码生成成功!");} catch (Exception e) {e.printStackTrace();}}

2.二维码解析

2.1 将源码中关于二维码解析的类拷贝进来

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;}@Overridepublic 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;}@Overridepublic 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;}@Overridepublic boolean isCropSupported() {return true;}@Overridepublic LuminanceSource crop(int left, int top, int width, int height) {return new BufferedImageLuminanceSource(image, this.left + left,this.top + top, width, height);}@Overridepublic boolean isRotateSupported() {return true;}@Overridepublic 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);}}

2.1 编写实现二维码解析的方法

private static void decode() {try {MultiFormatReader formatReader = new MultiFormatReader();String filePath = "C:\\Users\\Dong\\Desktop\\testImage\\url.png";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();}}

解析结果

参考：
- http://www.cnblogs.com/jtmjx/archive/2012/06/18/2545209.html
- https://www.zhihu.com/question/21096632

源码下载

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Java---利用Zing生成二维码、解析二维码

1.二维码生成

2.二维码解析

源码下载

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