java二維碼中間

A. java 生成二維碼後如何給該二維碼添加信息

java可使用zxing生成二維碼並為其添加信息。
以下是詳細步驟：
1、創建MatrixToImageWriter類

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、生成二維碼並添加信息

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;
//二維碼的圖片格式
Stringformat="gif";
Hashtablehints=newHashtable();
//內容所使用編碼
hints.put(EncodeHintType.CHARACTER_SET,"utf-8");
BitMatrixbitMatrix=newMultiFormatWriter().encode(text,
BarcodeFormat.QR_CODE,width,height,hints);
//生成二維碼
FileoutputFile=newFile("d:"+File.separator+"new.gif");
MatrixToImageWriter.writeToFile(bitMatrix,format,outputFile);

}

}

B. java 如何完成二維碼的製作

參考以下代碼：

//創建BarcodeSettings實例
BarcodeSettingssettings=newBarcodeSettings();
//設置條碼類型為QR二維碼
settings.setType(BarCodeType.QR_Code);
//設置二維碼數據
settings.setData("Hello123456789");
//設置二維碼顯示數據
settings.setData2D("Hello123456789");
//設置數據類型
settings.setQRCodeDataMode(QRCodeDataMode.Alpha_Number);
//設置二維碼模型寬度
settings.setX(1.0f);
//設置二維碼糾錯級別
settings.setQRCodeECL(QRCodeECL.H);
//創建BarCodeGenerator實例
=newBarCodeGenerator(settings);
//根據settings生成圖像數據，保存至BufferedImage實例
BufferedImagebufferedImage=barCodeGenerator.generateImage();
//保存為PNG圖片
ImageIO.write(bufferedImage,"png",newFile("QRCode.png"));
System.out.println("Complete!");

需要引用Spire.Barcode for java

原文：Java 生成二維碼

C. 怎麼使用java生成DataMatrix格式的二維碼

參考：

1. import com.spire.barcode.BarCodeGenerator;

2. import com.spire.barcode.BarCodeType;

3. import com.spire.barcode.BarcodeSettings;

4. import javax.imageio.ImageIO;

5. import java.awt.*;

6. import java.awt.image.BufferedImage;

7. import java.io.File;

8. 
   

9. public class CreateDataMatrix {

10. 
    

11. public static void main(String[] args) throws Exception {

12. 
    

13. //生成BarcodeSettings實例

14. BarcodeSettings settings = new BarcodeSettings();

15. //設置條形碼類型為DataMatrix

16. settings.setType(BarCodeType.Data_Matrix);

17. //設置條形碼模型寬度

18. settings.setX(1.5f);

19. //設置數據和顯示文本

20. settings.setData("ABC 123456789ABC 123456789ABC 123456789");

21. settings.setData2D("ABC 123456789ABC 123456789ABC 123456789");

22. //創建BarCodeGenerator實例

23. BarCodeGenerator barCodeGenerator = new BarCodeGenerator(settings);

24. //根據settings生成圖像數據，保存至BufferedImage實例

25. BufferedImage bufferedImage = barCodeGenerator.generateImage();

26. //保存為PNG圖片

27. ImageIO.write(bufferedImage, "png", new File("DataMatrix.png"));

28. System.out.println("Complete!");

29. }

30. }

用到了spire.barcode for java庫