java二维码zxing

A. java 生成二维码后如何给该二维码添加信息

java可使用zxing生成二维码并为其添加信息。
以下是详细步骤：
1、创建MatrixToImageWriter类

importcom.google.zxing.common.BitMatrix;
importjavax.imageio.ImageIO;
importjava.io.File;
importjava.io.OutputStream;
importjava.io.IOException;
importjava.awt.image.BufferedImage;


{

privatestaticfinalintBLACK=0xFF000000;
privatestaticfinalintWHITE=0xFFFFFFFF;

privateMatrixToImageWriter(){}


(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);
}
}

}

2、生成二维码并添加信息

importjava.io.File;
importjava.util.Hashtable;

importcom.google.zxing.BarcodeFormat;
importcom.google.zxing.EncodeHintType;
importcom.google.zxing.MultiFormatWriter;
importcom.google.zxing.WriterException;
importcom.google.zxing.common.BitMatrix;

publicclassTest{

/**
*@paramargs
*@throwsException
*/
publicstaticvoidmain(String[]args)throwsException{
Stringtext="http://www..com";
intwidth=300;
intheight=300;
//二维码的图片格式
Stringformat="gif";
Hashtablehints=newHashtable();
//内容所使用编码
hints.put(EncodeHintType.CHARACTER_SET,"utf-8");
BitMatrixbitMatrix=newMultiFormatWriter().encode(text,
BarcodeFormat.QR_CODE,width,height,hints);
//生成二维码
FileoutputFile=newFile("d:"+File.separator+"new.gif");
MatrixToImageWriter.writeToFile(bitMatrix,format,outputFile);

}

}