[置顶] Zxing和QR CODE 生成与解析二维码实例（普通篇）

首先下载对应的jar包，本实例用的是Zxing2.2jar

下载地址：http://download.csdn.net/detail/gao36951/8161861

Zxing是Google提供的关于条码（一维码、二维码）的解析工具，提供了二维码的生成与解析的方法，

下面看Zxing实例

代码：

package com.zxing.create;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;


import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
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.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.util.BufferedImageLuminanceSource;


/**  
 * @Description: (普通二维码生成)     
 * @author：Relieved  
 * @date：2014-11-7 下午04:42:35     
 */
public class CreateParseCode {
	public static void  main(String [] args) throws IOException, WriterException{
		CreateParseCode cpCode = new CreateParseCode();
//		生成二维码
		cpCode.createCode();
//		解析二维码
		cpCode.parseCode(new File("D:/二维码生成/TDC-test.png"));
		
	}
	/**
     * 二维码的生成
     *
     */
	public void createCode(){
		String text = "http://blog.csdn.net/gao36951";
		int width = 300;
		int height = 300;
		// 二维码的图片格式
		String format = "png";
		/**
		 * 设置二维码的参数
		 */
		HashMap hints = new HashMap();
		// 内容所使用编码
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE,width,height,hints);
			// 生成二维码
			File outputFile = new File("D:"+ File.separator +"二维码生成" + File.separator + "TDC-test.png");
			MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	/**
     * 二维码的解析
     *
     * @param file
     */
    public void parseCode(File file)
    {
        try
        {
            MultiFormatReader formatReader = new MultiFormatReader();
 
            if (!file.exists())
            {
                return;
            }
 
            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("解析结果 = " + result.toString());
            System.out.println("二维码格式类型 = " + result.getBarcodeFormat());
            System.out.println("二维码文本内容 = " + result.getText());
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

生成和解析相关工具类代码：

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, 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);
     }
   }
 
 }

package com.util;

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, 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);
  }

}

生成的二维码如下图：

解析结果如下：

下面看QR CODE实例

package com.qrcode.create;

/** 
 * @作者   Relieved
 * @创建日期   2014年11月7日
 * @描述  （利用QrCode生成二维码） 
 * @版本 V 1.0
 */
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

/**
 * 二维码生成器
 */
public class QRCodeEncoderHandler {

    /**
     * 生成二维码(QRCode)图片
     * @param content
     * @param imgPath
     */
    public void encoderQRCode(String content, String imgPath,int version) {
        try {

            Qrcode qrcodeHandler = new Qrcode();
            //设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小  
            qrcodeHandler.setQrcodeErrorCorrect('M');
            //N代表数字,A代表字符a-Z,B代表其他字符
            qrcodeHandler.setQrcodeEncodeMode('B');
            //版本1为21*21矩阵，版本每增1，二维码的两个边长都增4；所以版本7为45*45的矩阵；最高版本为是40，是177*177的矩阵
            qrcodeHandler.setQrcodeVersion(version);
	    int imgSize = 67 + 12 * (size - 1) ;
            System.out.println(content);
            byte[] contentBytes = content.getBytes("gb2312");

            BufferedImage bufImg = new BufferedImage(imgSize , imgSize ,BufferedImage.TYPE_INT_RGB);
            Graphics2D gs = bufImg.createGraphics();

            gs.setBackground(Color.WHITE);
            gs.clearRect(0, 0, imgSize , imgSize );

            // 设定图像颜色 > BLACK
            gs.setColor(Color.BLACK);

            // 设置偏移量 不设置可能导致解析出错
            int pixoff = 2;
            // 输出内容 > 二维码
            System.out.println(contentBytes.length);
            if (contentBytes.length > 0 && contentBytes.length < 130) {
                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
                for (int i = 0; i < codeOut.length; i++) {
                    for (int j = 0; j < codeOut.length; j++) {
                        if (codeOut[j][i]) {
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
                        }
                    }
                }
            } else {
                System.err.println("QRCode content bytes length = "
                        + contentBytes.length + " not in [ 0,130 ]. ");
            }

            gs.dispose();
            bufImg.flush();

            File imgFile = new File(imgPath);

            // 生成二维码QRCode图片
            ImageIO.write(bufImg, "png", imgFile);

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

    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String imgPath = "D:/二维码生成/Relieved_QRCode.png";

        String content = "http://blog.csdn.net/gao36951";

        QRCodeEncoderHandler handler = new QRCodeEncoderHandler();
        handler.encoderQRCode(content, imgPath,8);

        System.out.println("encoder QRcode success");
    }
}

生成二维码如下图

解析代码如下：

package com.qrcode.create.decreate;

/** 
 * @作者   Relieved
 * @创建日期   2014年11月7日
 * @描述  （解析QrCode二维码） 
 * @版本 V 1.0
 */
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

public class QRCodeDecoderHandler {

    /**
     * 解码二维码
     * @param imgPath
     * @return String
     */
    public String decoderQRCode(String imgPath) {

        // QRCode 二维码图片的文件
        File imageFile = new File(imgPath);

        BufferedImage bufImg = null;
        String decodedData = null;
        try {
            bufImg = ImageIO.read(imageFile);

            QRCodeDecoder decoder = new QRCodeDecoder();
            decodedData = new String(decoder.decode(new J2SEImage(bufImg)),"gb2312");

        } catch (IOException e) {
            System.out.println("Error: " + e.getMessage());
            e.printStackTrace();
        } catch (DecodingFailedException dfe) {
            System.out.println("Error: " + dfe.getMessage());
            dfe.printStackTrace();
        }
        return decodedData;
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        QRCodeDecoderHandler handler = new QRCodeDecoderHandler();
        String imgPath = "D:/二维码生成/Relieved_QRCode.png";
        String decoderContent = handler.decoderQRCode(imgPath);
        System.out.println("解析结果如下：");
        System.out.println(decoderContent);
        System.out.println("========decoder success!!!");
    }

    class J2SEImage implements QRCodeImage {
        BufferedImage bufImg;

        public J2SEImage(BufferedImage bufImg) {
            this.bufImg = bufImg;
        }

        public int getWidth() {
            return bufImg.getWidth();
        }

        public int getHeight() {
            return bufImg.getHeight();
        }

        public int getPixel(int x, int y) {
            return bufImg.getRGB(x, y);
        }

    }
}

解析结果如下图: