java生成二维码

转载处：http://blog.csdn.net/pxr1989104/article/details/51283585

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。

package com.phome.demo;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;import com.google.zxing.common.BitMatrix;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);     }   }}

2、生成二维码

package com.phome.demo;import java.io.File;import java.util.HashMap;import java.util.Map;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix;public class Ewm {public static void main(String[] args) {try {                 String content = "http://blog.csdn.net/u013804636";     String path = "C:\\Users\\Administartor\\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, 400,hints);     File file1 = new File(path,"1.jpg");     MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);      } catch (Exception e) {     e.printStackTrace(); }}}

3、解析二维码

package com.phome.demo;import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import com.google.zxing.LuminanceSource;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);   }}

package com.phome.demo;import java.awt.image.BufferedImage;import java.io.File;import java.util.HashMap;import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.Binarizer;import com.google.zxing.BinaryBitmap;import com.google.zxing.EncodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.Result;import com.google.zxing.common.HybridBinarizer;public class REwm {public static void main(String[] args) {try {            MultiFormatReader formatReader = new MultiFormatReader();String filePath = "C:\\Users\\Administartor\\Desktop\\testImage\\2.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();}}}