轉載處：http://blog.csdn.net/pxr1989104/article/details/51283585

1、二維碼的生成 　　1.1 將Zxing-core.jar 包加入到classpath下。　　 1.2 二維碼的生成需要借助MatrixToImageWriter類，該類是由Google提供的，可以將該類拷貝到源碼中，這里我將該類的源碼貼上，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、生成二維碼
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、解析二維碼
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();			}	}}