ZXing工具类详解
生成条形码，二维码图片，解析条形码，二维码图片的工具类，需要用到的jar包：core.jar,zxing-javase.jar
package zxing;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
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.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
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;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
/**
* @author wiki
*/
public class ZxingTool {
private static final int IMAGE_WIDTH = 80;
private static final int IMAGE_HEIGHT = 80;
private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
private static final int FRAME_WIDTH = 2;
/**
* 生成条形码
*
* @param contents 条形码内容
* @param width 条形码宽度
* @param height 条形码高度
* @return
*/
public static BufferedImage encodeBarcode(String contents, int width, int height) {
int codeWidth = 3 + // start guard
(7 * 6) + // left bars
5 + // middle guard
(7 * 6) + // right bars
3; // end guard
codeWidth = Math.max(codeWidth, width);
BufferedImage barcode = null;
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.EAN_13, codeWidth, height, null);
barcode = MatrixToImageWriter.toBufferedImage(bitMatrix);
} catch (Exception e) {
e.printStackTrace();
}
return barcode;
}
/**
* 解析读取条形码
*
* @param barcodePath 条形码文件路径
* @return
*/
public static String decodeBarcode(String barcodePath) {
BufferedImage image;
Result result = null;
try {
image = ImageIO.read(new File(barcodePath));
if (image != null) {
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
result = new MultiFormatReader().decode(bitmap, null);
}
return result.getText();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 生成二维码
*
* @param context 二维码内容
* @param width 二维码图片宽度
* @param height 二维码图片高度
* @return
*/
public static BufferedImage encodeQRcode(String context, int width, int height) {
BufferedImage qrCode = null;
try {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(context, BarcodeFormat.QR_CODE, width, height, hints);
qrCode = MatrixToImageWriter.toBufferedImage(bitMatrix);
} catch (WriterException ex) {
Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
}
return qrCode;
}
/**
* 生成带有logo标志的二维码
*
* @param context 二维码存储内容
* @param width 二维码宽度
* @param height 二维码高度
* @param logoPath 二维码logo路径
* @return
*/
public static BufferedImage encodeLogoQRcode(String context, int width, int height, String logoPath) {
BufferedImage logoQRcode = null;
try {
// 读取Logo图像
BufferedImage logoImage = scale(logoPath, IMAGE_WIDTH, IMAGE_HEIGHT, true);
int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
for (int i = 0; i < logoImage.getWidth(); i++) {
for (int j = 0; j < logoImage.getHeight(); j++) {
srcPixels[i][j] = logoImage.getRGB(i, j);
}
}
Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>();
hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
BitMatrix bitMatrix = new MultiFormatWriter().encode(context, BarcodeFormat.QR_CODE, width, height, hint);
// 二维矩阵转为一维像素数组
int halfW = bitMatrix.getWidth() / 2;
int halfH = bitMatrix.getHeight() / 2;
int[] pixels = new int[width * height];
for (int y = 0; y < bitMatrix.getHeight(); y++) {
for (int x = 0; x < bitMatrix.getWidth(); x++) {
// 读取图片
if (x > halfW - IMAGE_HALF_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH
&& y < halfH + IMAGE_HALF_WIDTH) {
pixels[y * width + x] = srcPixels[x - halfW
+ IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
}
// 在图片四周形成边框
else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
- IMAGE_HALF_WIDTH + FRAME_WIDTH)
|| (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
&& x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
&& y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
+ IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
pixels[y * width + x] = 0xfffffff;
} else {
// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
pixels[y * width + x] = bitMatrix.get(x, y) ? 0xff000000 : 0xfffffff;
}
}
}
logoQRcode = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
logoQRcode.getRaster().setDataElements(0, 0, width, height, pixels);
} catch (WriterException ex) {
Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
}
return logoQRcode;
}
/**
* 解析读取二维码
*
* @param qrCodePath 二维码图片路径
* @return
*/
public static String decodeQRcode(String qrCodePath) {
BufferedImage image;
String qrCodeText = null;
try {
image = ImageIO.read(new File(qrCodePath));
LuminanceSource source = new BufferedImageLuminanceSource(image);
Binarizer binarizer = new HybridBinarizer(source);
BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
// 对图像进行解码
Result result = new MultiFormatReader().decode(binaryBitmap, hints);
qrCodeText = result.getText();
} catch (IOException e) {
e.printStackTrace();
} catch (NotFoundException e) {
e.printStackTrace();
}
return qrCodeText;
}
/**
* 对图片进行缩放
*
* @param imgPath 图片路径
* @param width 图片缩放后的宽度
* @param height 图片缩放后的高度
* @param hasFiller 是否补白
* @return
*/
public static BufferedImage scale(String imgPath, int width, int height, boolean hasFiller) {
double ratio = 0.0; // 缩放比例
File file = new File(imgPath);
BufferedImage srcImage = null;
try {
srcImage = ImageIO.read(file);
} catch (IOException ex) {
Logger.getLogger(ZxingTool.class.getName()).log(Level.SEVERE, null, ex);
}
Image finalImage;
finalImage = srcImage.getScaledInstance(width, height, BufferedImage.SCALE_SMOOTH);
// 计算比例
if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
if (srcImage.getHeight() > srcImage.getWidth()) {
ratio = (new Integer(height)).doubleValue() / srcImage.getHeight();
} else {
ratio = (new Integer(width)).doubleValue() / srcImage.getWidth();
}
AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);
finalImage = op.filter(srcImage, null);
}
if (hasFiller) {// 补白
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphic = image.createGraphics();
graphic.setColor(Color.white);
graphic.fillRect(0, 0, width, height);
if (width == finalImage.getWidth(null)) {
graphic.drawImage(finalImage, 0, (height - finalImage.getHeight(null)) / 2, finalImage.getWidth(null), finalImage.getHeight(null), Color.white, null);
} else {
graphic.drawImage(finalImage, (width - finalImage.getWidth(null)) / 2, 0, finalImage.getWidth(null), finalImage.getHeight(null), Color.white, null);
graphic.dispose();
finalImage = image;
}
}
return (BufferedImage) finalImage;
}
}
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