ZXing 二维码编码&解码
借助google.zxing生成二维码，需用到的jar<dependencies>
<dependency>
<groupId>com.beust</groupId>
<artifactId>jcommander</artifactId>
<version>1.48</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.0</version>
</dependency>
</dependencies>
代码package web;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Map;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码编码&解码
* @Author: ChenGuiYong 2015年7月13日 上午11:09:56
* @Version: $Id$
* @Desc: <p></p>
*/
public class QRCodeUtil {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
/*
* 解码：
* 1 将图片反解码为二维矩阵
* 2 将该二维矩阵解码为内容
* */
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void decode(String imgPath) {
try {
File file = new File(imgPath);//获取该图片文件
BufferedImage image;
try {
image = ImageIO.read(file);
if (image == null) {
System.out.println("Could not decode image");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable hints = new Hashtable();//将图片反解码为二维矩阵
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
result = new MultiFormatReader().decode(bitmap, hints);//将该二维矩阵解码成内容
String resultStr = result.getText();
System.out.println("解码结果："+resultStr);
} catch (IOException ioe) {
System.out.println(ioe.toString());
} catch (ReaderException re) {
System.out.println(re.toString());
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* 编码
* @author ChenGuiYong
* @data 2015年7月13日 上午11:06:20
* @param contents
* @param width
* @param height
* @param imgPath
* @param logoPath
* @return
*/
public static boolean encode(String contents, int width, int height, String imgPath,String logoPath) {
Map<EncodeHintType, Object> hints = new Hashtable<>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//设置二维码内容到边框的距离
hints.put(EncodeHintType.MARGIN, 1);
String format = "png";
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, format ,new FileOutputStream(imgPath));
File qrcodeFile = new File(imgPath);
//增加logo
writeToLogo(bitMatrix,format , qrcodeFile, logoPath);
} catch (Exception e) {
return false;
}
System.out.println("编码成功！");
return true;
}
/**
* 增加Logo
* @author ChenGuiYong
* @data 2015年7月13日 上午11:07:00
* @param matrix
* @param format
* @param file
* @param logoPath
* @throws IOException
*/
public static void writeToLogo(BitMatrix matrix,String format,File file,String logoPath) throws IOException {
Graphics2D graphics2 = null;
BufferedImage image = null;
BufferedImage logo = null;
try {
/**
* 读取二维码图片，并构建绘图对象
*/
image = toBufferedImage(matrix);
graphics2 = image.createGraphics();
/**
* 读取Logo图片
*/
logo = ImageIO.read(new File(logoPath));
int codeWidth = image.getWidth();
int codeHeight = image.getHeight();
/**
* 设置logo的大小,设置为二维码图片的25%,因为过大会盖掉二维码
*/
int widthLogo = logo.getWidth(null)>codeWidth*2/13?(codeWidth*2/13):logo.getWidth(null),
heightLogo = logo.getHeight(null)>codeHeight*2/13?(codeHeight*2/13):logo.getWidth(null);
/**
* 计算图片放置位置
* logo放在中心
*/
int x = (codeWidth - widthLogo) / 2;
int y = (codeHeight - heightLogo) / 2;
int radius = 14;//圆角范围
//填充与logo大小类似的扁平化圆角矩形背景
graphics2.setComposite(AlphaComposite.Src);
graphics2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics2.setColor(Color.WHITE);
graphics2.fill(new RoundRectangle2D.Float(x-2, y-2, widthLogo+4, heightLogo+4,radius,radius));
graphics2.setComposite(AlphaComposite.SrcAtop);
//开始绘制logo图片
graphics2.drawImage(logo, x, y, widthLogo, heightLogo, null);
if(!ImageIO.write(image, format, file)){
throw new IOException("Could not write an image of format " + format + " to " + file);
}
} catch (Exception e) {
throw e;
}finally{
if(graphics2!=null){
graphics2.dispose();
}
if(logo!=null){
logo.flush();
}
if(image!=null){
image.flush();
}
}
}
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 main(String[] args) {
String contents="http://www.baidu.com";
String imgPath = "D:/zxing/zxing.png";
String logoPath = "D:/logo.png";
QRCodeUtil.encode(contents, 200, 200, imgPath,logoPath);
QRCodeUtil.decode(imgPath);
}
}
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