Java利用Zxing生成二维码的简单实例
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
1、二维码的生成
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。
importcom.google.zxing.common.BitMatrix;
importjavax.imageio.ImageIO;
importjava.io.File;
importjava.io.OutputStream;
importjava.io.IOException;
importjava.awt.image.BufferedImage;
publicfinalclassMatrixToImageWriter{
privatestaticfinalintBLACK=0xFF000000;
privatestaticfinalintWHITE=0xFFFFFFFF;
privateMatrixToImageWriter(){}
publicstaticBufferedImagetoBufferedImage(BitMatrixmatrix){
intwidth=matrix.getWidth();
intheight=matrix.getHeight();
BufferedImageimage=newBufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
for(intx=0;x<width;x++){
for(inty=0;y<height;y++){
image.setRGB(x,y,matrix.get(x,y)?BLACK:WHITE);
}
}
returnimage;
}
publicstaticvoidwriteToFile(BitMatrixmatrix,Stringformat,Filefile)
throwsIOException{
BufferedImageimage=toBufferedImage(matrix);
if(!ImageIO.write(image,format,file)){
thrownewIOException("Couldnotwriteanimageofformat"+format+"to"+file);
}
}
publicstaticvoidwriteToStream(BitMatrixmatrix,Stringformat,OutputStreamstream)
throwsIOException{
BufferedImageimage=toBufferedImage(matrix);
if(!ImageIO.write(image,format,stream)){
thrownewIOException("Couldnotwriteanimageofformat"+format);
}
}
}
1.3编写生成二维码的实现代码
try{
Stringcontent="120605181003;http://www.cnblogs.com/jtmjx";
Stringpath="C:/Users/Administrator/Desktop/testImage";
MultiFormatWritermultiFormatWriter=newMultiFormatWriter();
Maphints=newHashMap();
hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");
BitMatrixbitMatrix=multiFormatWriter.encode(content,BarcodeFormat.QR_CODE,400,400,hints);
Filefile1=newFile(path,"餐巾纸.jpg");
MatrixToImageWriter.writeToFile(bitMatrix,"jpg",file1);
}catch(Exceptione){
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
importcom.google.zxing.LuminanceSource;
importjava.awt.Graphics2D;
importjava.awt.geom.AffineTransform;
importjava.awt.image.BufferedImage;
publicfinalclassBufferedImageLuminanceSourceextendsLuminanceSource{
privatefinalBufferedImageimage;
privatefinalintleft;
privatefinalinttop;
publicBufferedImageLuminanceSource(BufferedImageimage){
this(image,0,0,image.getWidth(),image.getHeight());
}
publicBufferedImageLuminanceSource(BufferedImageimage,intleft,inttop,intwidth,intheight){
super(width,height);
intsourceWidth=image.getWidth();
intsourceHeight=image.getHeight();
if(left+width>sourceWidth||top+height>sourceHeight){
thrownewIllegalArgumentException("Croprectangledoesnotfitwithinimagedata.");
}
for(inty=top;y<top+height;y++){
for(intx=left;x<left+width;x++){
if((image.getRGB(x,y)&0xFF000000)==0){
image.setRGB(x,y,0xFFFFFFFF);//=white
}
}
}
this.image=newBufferedImage(sourceWidth,sourceHeight,BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image,0,0,null);
this.left=left;
this.top=top;
}
@Override
publicbyte[]getRow(inty,byte[]row){
if(y<0||y>=getHeight()){
thrownewIllegalArgumentException("Requestedrowisoutsidetheimage:"+y);
}
intwidth=getWidth();
if(row==null||row.length<width){
row=newbyte[width];
}
image.getRaster().getDataElements(left,top+y,width,1,row);
returnrow;
}
@Override
publicbyte[]getMatrix(){
intwidth=getWidth();
intheight=getHeight();
intarea=width*height;
byte[]matrix=newbyte[area];
image.getRaster().getDataElements(left,top,width,height,matrix);
returnmatrix;
}
@Override
publicbooleanisCropSupported(){
returntrue;
}
@Override
publicLuminanceSourcecrop(intleft,inttop,intwidth,intheight){
returnnewBufferedImageLuminanceSource(image,this.left+left,this.top+top,width,height);
}
@Override
publicbooleanisRotateSupported(){
returntrue;
}
@Override
publicLuminanceSourcerotateCounterClockwise(){
intsourceWidth=image.getWidth();
intsourceHeight=image.getHeight();
AffineTransformtransform=newAffineTransform(0.0,-1.0,1.0,0.0,0.0,sourceWidth);
BufferedImagerotatedImage=newBufferedImage(sourceHeight,sourceWidth,BufferedImage.TYPE_BYTE_GRAY);
Graphics2Dg=rotatedImage.createGraphics();
g.drawImage(image,transform,null);
g.dispose();
intwidth=getWidth();
returnnewBufferedImageLuminanceSource(rotatedImage,top,sourceWidth-(left+width),getHeight(),width);
}
}
2.3编写解析二维码的实现代码
try{
MultiFormatReaderformatReader=newMultiFormatReader();
StringfilePath="C:/Users/Administrator/Desktop/testImage/test.jpg";
Filefile=newFile(filePath);
BufferedImageimage=ImageIO.read(file);;
LuminanceSourcesource=newBufferedImageLuminanceSource(image);
Binarizerbinarizer=newHybridBinarizer(source);
BinaryBitmapbinaryBitmap=newBinaryBitmap(binarizer);
Maphints=newHashMap();
hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");
Resultresult=formatReader.decode(binaryBitmap,hints);
System.out.println("result="+result.toString());
System.out.println("resultFormat="+result.getBarcodeFormat());
System.out.println("resultText="+result.getText());
}catch(Exceptione){
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！
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