应用场景
推广海报，每个业务员拿的的海报，都要有自己的二维码，美工根本忙不过来，也不好管理。
上代码
pom.xml
<!-- https://mvnrepository.com/artifact/cn.bingoogolapple/bga-qrcode-zxing -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.4.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
工具类
package org.alvin.qws;
import com.google.zxing.*;
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 net.coobird.thumbnailator.Thumbnails;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
/**
* @author 唐植超
* @date 2019/11/06
*/
public class QRCodeImageUtils {
/**
* 生成二维码
*
* @param content
* @param size
* @return
*/
public static BitMatrix genQrCode(String content, int size) {
//设置图片的文字编码以及内边框
Map<EncodeHintType, Object> hints = new HashMap<>();
//编码
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
//边框距
hints.put(EncodeHintType.MARGIN, 0);
BitMatrix bitMatrix;
try {
//参数分别为：编码内容、编码类型、图片宽度、图片高度，设置参数
bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, size, size, hints);
} catch (WriterException e) {
e.printStackTrace();
return null;
}
return bitMatrix;
}
/**
* 二维码转字节
*
* @param content
* @param size
* @return
* @throws IOException
*/
public static byte[] getQrBuffer(String content, int size) throws IOException {
try (ByteArrayOutputStream byteArray = new ByteArrayOutputStream()) {
MatrixToImageWriter.writeToStream(genQrCode(content, size), "png", byteArray);
return byteArray.toByteArray();
}
}
/**
* 二维码转图片
*
* @param content
* @param size
* @return
*/
public static BufferedImage getQRImg(String content, int size) {
return MatrixToImageWriter.toBufferedImage(genQrCode(content, size));
}
/**
* 合并图片和二维码
*
* @param logoPath 图标路径
* @param imgPath 模板途径
* @param qrContent 二维码内容
* @param size //二维码尺寸
* @param x //二维码贴的位置x
* @param y //二维码贴的位置y
* @param angel //传0没有角度
* @return
*/
public static BufferedImage mergeImageAndQR(String logoPath, String imgPath, String qrContent, int size, int x, int y, double angel) throws IOException {
try (InputStream is = Files.newInputStream(Paths.get(imgPath))) {
BufferedImage bi = ImageIO.read(is);
Graphics2D g2 = bi.createGraphics();
BufferedImage bufferedImage = null;
if (logoPath != null && !logoPath.isEmpty()) {
File logoFile = new File(logoPath);
if (logoFile != null && logoFile.exists()) {
bufferedImage = drawLogoQRCode(logoFile, qrContent, size, angel);
}
} else {
bufferedImage = Thumbnails.of(getQRImg(qrContent, size)).size(size, size).rotate(angel).asBufferedImage();
}
//消除文字锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
//消除画图锯齿
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawImage(bufferedImage, x, y, null);
g2.dispose();
return bi;
}
}
/**
* 根据图片路径识别二维码
*
* @param imgPath
* @return
* @throws IOException
* @throws NotFoundException
*/
public static String readQr(String imgPath) throws IOException, NotFoundException {
try (InputStream is = Files.newInputStream(Paths.get(imgPath))) {
return readQrByImg(ImageIO.read(is));
}
}
//根据传入的图片，识别二维码
public static String readQrByImg(BufferedImage img) throws NotFoundException {
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(img)));
HashMap properties = new HashMap();
properties.put(EncodeHintType.CHARACTER_SET, "utf-8");//字符集
MultiFormatReader formatReader = new MultiFormatReader();
Result result = formatReader.decode(binaryBitmap, properties);
return result.getText();
}
/**
* 生成带logo的二维码图片
*
* @param logoFile logo路径
* @param content 内容
* @param size 二维码大小
* @param angel
*/
public static BufferedImage drawLogoQRCode(File logoFile, String content, int size, double angel) throws IOException {
BufferedImage image = Thumbnails.of(getQRImg(content, size)).size(size, size).rotate(angel).asBufferedImage();
int width = image.getWidth();
int height = image.getHeight();
//绘制logo
// 构建绘图对象
Graphics2D g2 = image.createGraphics();
// 读取Logo图片
int x = width * 2 / 5;
int y = height * 2 / 5;
int cWidth = width * 2 / 10;
int cHeight = height * 2 / 10;
BufferedImage bufferedImage = Thumbnails.of(ImageIO.read(logoFile)).size(width, height).rotate(angel).asBufferedImage();
// 开始绘制logo图片
//消除文字锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
//消除画图锯齿
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawImage(bufferedImage, x, y, cWidth, cHeight, null);
g2.dispose();
bufferedImage.flush();
image.flush();
return image;
}
}
测试类
public static void main(String[] args) throws IOException, NotFoundException {
String imagePath = "D:\\test.jpg";
String qrContent = "http://www.baidu.com";
int size = 100;
int x = 30;
int y = 380;
//合并输出二维码
// BufferedImage img = mergeImageAndQRByAngel(imagePath, qrContent, size, x, y, 20);
// ImageIO.write(img, "png", new File("D:/test1.png"));
// 识别二维码
// System.out.println(readQrByImg(img));
BufferedImage img = mergeImageAndQR("D:/th.jpg", imagePath, qrContent, size, x, y, 30);
ImageIO.write(img, "png", new File("D:/test1.png"));
}
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