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详解ZXing-core生成二维码的方法并解析

转载 作者:qq735679552 更新时间:2022-09-29 22:32:09 26 4
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这篇CFSDN的博客文章详解ZXing-core生成二维码的方法并解析由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.

二维码无处不在,扫一扫有礼品哦,现在二维码这么流行,想必大家不是很清楚二维码是怎么生成的吧,现在小编通过给大家分享本文帮助大家学习二维码生成的方法.

其实主要是利用goggle发布的jar来使用的此功能.

1、二维码的生成 。

将Zxing-core.jar 包加入到classpath下.

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.

直接可以生成二维码的代码 。

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public void test1() throws Exception{
String content = "www.baidu.com" ;
String path = "d://" ;
MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); //Zxing是Google提供的关于条码
Map hints = new HashMap();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8" );
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400 , 400 ,hints); //这里是照片的大小
File file1 = new File(path, "my.jpg" );
MatrixToImageWriter.writeToFile(bitMatrix, "jpg" , file1);
System.out.println( "执行完毕" );
}

当我们能发现,这个代码拷贝上后发现有一个MatrixToImageWriter报错,所以需要我们去找,但是这里我贴出代码,可以直接使用.

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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);
}
}
}

现在就可以d盘的根目录下载看生成的二维码了 。

二维码解析 。

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 。

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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);
}
}

解析二维码的代码 。

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MultiFormatReader formatReader = new MultiFormatReader();
String filePath = "图片的路径" ;
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());
tch (Exception e) {
e.printStackTrace();

现在这样可以在控制台看到二维码的内容.

以上所述是小编给大家介绍的ZXing-core生成二维码的方法并解析的相关知识,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我网站的支持! 。

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