Java借助Zxing生成二维码

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,OutputStream stream)
       throws IOException {
     BufferedImage image = toBufferedImage(matrix);
     if (!ImageIO.write(image,stream)) {
       throw new IOException("Could not write an image of format " + format);
     }
   }

 }

try {

     String content = "120605181003;http://www.cnblogs.com/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,hints);
     File file1 = new File(path,"餐巾纸.jpg");
     MatrixToImageWriter.writeToFile(bitMatrix,"jpg",file1);

 } catch (Exception e) {
     e.printStackTrace();
 }

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,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,0xFFFFFFFF); // = white
         }
       }
     }

     this.image = new BufferedImage(sourceWidth,sourceHeight,BufferedImage.TYPE_BYTE_GRAY);
     this.image.getGraphics().drawImage(image,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,matrix);
     return matrix;
   }

   @Override
   public boolean isCropSupported() {
     return true;
   }

   @Override
   public LuminanceSource crop(int left,int height) {
     return new BufferedImageLuminanceSource(image,this.left + left,this.top + top,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,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,sourceWidth - (left + width),getHeight(),width);
   }

 }

 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();
         }