Java生成二维码并贴到新的图片上
一、简述
1、Java生成二维码以来一些第三方库，本地的api会有一些bug，比如生成图片会造成红色蒙版,还有当二维码中字数过多，会造成二维码大小出现问题，要不就是二维码很大，要不就是二维码白边很大。
解决办法：一般二维码扫描是链接，但是有的会带着id或者uuid或者营销员的信息，为了使链接变短，使二维码正常，将链接过长的部门进行参数hash，将链接变短，使二维码正常
maven
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.4.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-extra</artifactId>
<version>5.4.3</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>simpleimage</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>com.sun.media</groupId>
<artifactId>jai-codec</artifactId>
<version>1.1.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.14</version>
</dependency>
<dependency>
<groupId>com.twelvemonkeys.imageio</groupId>
<artifactId>imageio-jpeg</artifactId>
<version>3.3.2</version>
</dependency>
附代码：
@Component
public class MyQrCodeUtils {
private final Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private QrCodeService qrCodeService;
/***
* 在一张背景图上添加二维码
*/
public String drawString(String content, QRCodeCoordinates qRCodeCoordinates,String instNo) throws Exception {
BufferedImage image = this.addWaters(content,qRCodeCoordinates,instNo);
ByteArrayOutputStream output = new ByteArrayOutputStream();
Thumbnails.of(image).scale(1f).outputFormat("jpeg").toOutputStream(output);
Base64.Encoder encoder = Base64.getEncoder(); // 实例化一个对byte[]型数据进行64位编码的对象
String blob = encoder.encodeToString(output.toByteArray());
String returnInfo = "data:image/jpeg;base64," + blob; // 前台直接把returnInfo放入img标签的src中
logger.warn("图长度为:"+returnInfo.length());
output.close();
return returnInfo;
}
public BufferedImage addWaters(String content,QRCodeCoordinates qRCodeCoordinates,String instNo)
throws Exception {
// 获取底图
String path = qRCodeCoordinates.getPath();
InputStream inputStream = getInputStream(path);
BufferedImage buffImg = Thumbnails.of(inputStream).scale(1.0)
.asBufferedImage();
// 获取层图
Integer qrw = qRCodeCoordinates.getQrw();
logger.warn("层图qrw:"+qrw);
//中间log的地址
String middlePic = "logoUrl";
logger.warn("logoUrl:===="+middlePic);
BufferedImage waterImg =
qrCodeService.createQrCodeWithLogoAndNodeCorner(content, qrw, getInputStream(middlePic), instNo);
// 创建Graphics2D对象，用在底图对象上绘图
Graphics2D g2d = buffImg.createGraphics();
int waterImgWidth = waterImg.getWidth();// 获取层图的宽度
int waterImgHeight = waterImg.getHeight();// 获取层图的高度
// 在图形和图像中实现混合和透明效果
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 1f));
// 绘制
g2d.drawImage(waterImg, qRCodeCoordinates.getOffsetx(), qRCodeCoordinates.getOffsety(), waterImgWidth, waterImgHeight, null);
g2d.dispose();// 释放图形上下文使用的系统资源
return buffImg;
}
private static final String CHARSET = "utf-8";
private BufferedImage createQrCode2(String content, int width, int height,String middlePic) throws Exception {
QrConfig config = new QrConfig(width, height);
if(!StringUtils.isEmpty(middlePic)){
Image image = ImageIO.read(getInputStream(middlePic));
config.setImg(image);
}
config.setErrorCorrection(ErrorCorrectionLevel.L);
config.setMargin(1);
BitMatrix bitMatrix = QrCodeUtil.encode(content,
config);
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) ? BLACK
: WHITE );
}
}
return image;
}
private static BufferedImage createQrCode(String content, int width, int height,String middlePic) throws IOException {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = null;
try {
bitMatrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, width, height, hints);
} catch (WriterException e) {
e.printStackTrace();
}
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) ? BLACK
: WHITE);
}
}
return image;
}
public static InputStream resourceLoader(String fileFullPath) throws IOException {
InputStream fileInputStream = new FileInputStream(new File(fileFullPath));
return fileInputStream;
}
public InputStream getInputStream(String urls)throws Exception {
return getHttpString(urls);
}
public InputStream getHttpString(String path) {
// 网络请求所需变量
InputStream in = null;
try {
URL url = new URL(path);
// 根据Url打开地址，以utf-8编码的形式返回输入流
in = url.openStream();
return in;
} catch ( Exception e) {
}
return null;
}
}