Java 生成二维码

<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.1</version>
</dependency>

package org.zgf.zxing.util;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public 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;
}

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;
}

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;
}

public boolean isCropSupported() {
return true;
}

public LuminanceSource crop(int left, int top, int width, int height) {
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
}

public boolean isRotateSupported() {
return true;
}

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);
}
<strong>}</strong>

package org.zgf.zxing.util;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;

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.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
* 二维码工具类
*/
public class QRCodeUtil {

/** 字符编码UTF-8 */
private static final String CHARSET_UTF8 = "utf-8";

/***
* 生成二维码图片
* @param content 二维码携带文本内容
* @return BufferedImage
* @throws Exception
*/
private static BufferedImage createImage(String content,int qrSize) throws Exception {
HashMap<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET_UTF8);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrSize, qrSize, hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
return image;
}

/**
* 图片中嵌入图片（二维码中插入logo）
* @param qrBi 二维码BufferedImage
* @param qcSize
* @param imgPath
* @param logoSize
* @throws Exception
*/
private static void insertImage(BufferedImage qrBi, String imgPath, int logoSize) throws Exception {
// 判断嵌入的文件是否存在
File file = new File(imgPath);
if (!file.exists()) {
throw new RuntimeException("" + imgPath + "   该文件不存在！");
}

// 读取嵌入的图片
Image imgSource = ImageIO.read(new File(imgPath));
int width = imgSource.getWidth(null);
int height = imgSource.getHeight(null);

// 压缩LOGO
if (width > logoSize) {
width = logoSize;
}
if (height > logoSize) {
height = logoSize;
}
Image image = imgSource.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.dispose();
imgSource = image;

// 插入LOGO
Graphics2D graph = qrBi.createGraphics();
int x = (qrBi.getWidth() - width) / 2;
int y = (qrBi.getHeight() - height) / 2;
graph.drawImage(imgSource, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}

/**
* 生成二维码（嵌入图片）
* @param content 二维码携带文本内容
* @param logoFilePath 嵌入图片路径
* @param qrPath  二维码图片生成文件
* @throws Exception
*/
public static void createQRCode(String content, int qcSize,  String logoFilePath, int logoSize, String qrPath) throws Exception {
//1. 生成二维码图片
BufferedImage image = QRCodeUtil.createImage(content,qcSize);
//2. 二维码图片中嵌入logo
insertImage(image, logoFilePath,logoSize);
//3. 图片写入磁盘
ImageIO.write(image, "png", new File(qrPath));
}

/**
* 生成二维码图片（不包含图片）
* @param content 二维码携带文本内容
* @param qcSize 二维码大小
* @param qrPath 生成的二维码文件全路径名
* @throws Exception
*/
public static void createQRCode(String content, int qcSize ,String qrPath) throws Exception{
BufferedImage image = QRCodeUtil.createImage(content,qcSize);
ImageIO.write(image, "png", new File(qrPath));

}

/**
* 解析二维码
*
* @param file 二维码图片
* @return 二维码携带内容
* @throws Exception
*/
public static String parseQRCode(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
HashMap<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET_UTF8);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}

/**
* 解析二维码
*
* @param path 二维码所在路径
* @return 二维码携带文本内容
* @throws Exception
*/
public static String parseQRCode(String path) throws Exception {
return QRCodeUtil.parseQRCode(new File(path));
}

}

package org.zgf.zxing.util;
/**
*  二维码工具类测试
*/
public class Test_QR {

//不包含图片的二维码生成路径
private static String qr1 = "d:/qrImgs/qr_001.jpg";

//包含图片的二维码生成路径
private static String qr2 = "d:/qrImgs/qr_002.jpg";

/** 二维码携带内容 */
private static String qrContent = "http://www.baidu.com";

public static void main(String[] args) throws Exception {

//1. 测试生成不包含图片的二维码
createQRWithOutLogo();

//2. 测试生成包含图片的二维码
createQRIncludeLogo();

//3. 测试解析不包含图片的二维码
parseQRIncludeLogo();

//4. 测试解析包含图片的二维码
parseQRWithOutLogo();

}

//测试生成不包含图片的二维码
private static void createQRWithOutLogo() throws Exception{
QRCodeUtil.createQRCode(qrContent, 200, qr1);
System.out.println("不包含图片的二维码已经生成...\n**************************\n");
}

//测试包含图片的二维码
private static void createQRIncludeLogo() throws Exception{
QRCodeUtil.createQRCode(qrContent, 200, "logo.png", 50, qr2);
System.out.println("包含图片的二维码已经生成...\n**************************\n");
}

private static void parseQRWithOutLogo() throws Exception{
String result = QRCodeUtil.parseQRCode(qr1);
System.out.println("不包含图片的二维码解析结果:" + result + "\n**************************\n");
}

private static void parseQRIncludeLogo() throws Exception{
String result = QRCodeUtil.parseQRCode(qr2);
System.out.println("包含图片的二维码解析结果:" + result + "\n**************************\n");
}

}

不包含图片的二维码已经生成...
**************************

包含图片的二维码已经生成...
**************************

包含图片的二维码解析结果:http://www.baidu.com
**************************

不包含图片的二维码解析结果:http://www.baidu.com
**************************