Java利用Zxing生成二维码(Domino也适用)
Zxing是Google提供的关于条码（一维码、二维码）的解析工具，提供了二维码的生成与解析的方法，现在我简单介绍一下使用Java利用Zxing生成与解析二维码
Jar包下载：https://www.360docs.net/doc/6310525341.html,/question/tag/zxing
1、二维码的生成
1.1 将Zxing-core.jar 包加入到classpath下
（如果是Domino平台，请参考本人的文库：
https://www.360docs.net/doc/6310525341.html,/view/833294e09b89680203d825b7?fr=prin）。
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 https://www.360docs.net/doc/6310525341.html,mon.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;https://www.360docs.net/doc/6310525341.html,/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;
publicfinalclass BufferedImageLuminanceSource extends LuminanceSource {
privatefinal BufferedImage image;
privatefinalint left;
privatefinalint 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) { thrownew 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
publicbyte[] getRow(int y, byte[] row) {
if (y < 0 || y >= getHeight()) {
thrownew IllegalArgumentException("Requested row is outside the image: " + y);
}
int width = getWidth();
if (row == null || row.length < width) {
row = newbyte[width];
}
image.getRaster().getDataElements(left, top + y, width, 1, row); return row;
}
@Override
publicbyte[] getMatrix() {
int width = getWidth();
int height = getHeight();
int area = width * height;
byte[] matrix = newbyte[area];
image.getRaster().getDataElements(left, top, width, height, matrix);
return matrix;
}
@Override
publicboolean isCropSupported() {
returntrue;
}
@Override
public LuminanceSource crop(int left, int top, int width, int height) { returnnew BufferedImageLuminanceSource(image, this.left + left,
this.top + top, width, height);
}
@Override
publicboolean isRotateSupported() {
returntrue;
}
@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();
returnnew 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，主要为自己做备忘，同时方便有需要的人。呵呵！
备注：本文主要参考帅星星的博客制作而成，本人在Domino下成功生成。
原文地址：https://www.360docs.net/doc/6310525341.html,/jtmjx/archive/2012/06/18/2545209.html