java Springboot 生成 二维码 +logo
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1.工具类
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.sun.org.apache.xml.internal.security.utils.Base64;
import org.springframework.util.ResourceUtils;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
public class QrCodeUtil {
public String createQRCode(String content,int width,int height,String path) throws IOException {
String resultImage="";
if(!EmptyUtils.isEmpty(content)){
ServletOutputStream stream=null;
ByteArrayOutputStream os=new ByteArrayOutputStream();
@SuppressWarnings("rawtypes")
HashMap<EncodeHintType,Comparable> hints=new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET,"utf-8");//指定字符编码为“utf-8”
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);//指定二维码的纠错等级为中
hints.put(EncodeHintType.MARGIN,2);//指定二维码边距
try {
QRCodeWriter writer=new QRCodeWriter();
BitMatrix bitMatrix=writer.encode(content, BarcodeFormat.QR_CODE,width,height,hints);
MatrixToImageConfig config = new MatrixToImageConfig(0xFF000001, 0xFFFFFFFF);
BufferedImage bufferedImage= MatrixToImageWriter.toBufferedImage(bitMatrix,config);
// BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// for (int x = 0; x < width; x++) {
// for (int y = 0; y < height; y++) {
// bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
// }
// }
Graphics2D g2 = bufferedImage.createGraphics();
g2.drawImage(ImageIO.read(ResourceUtils.getFile(path)), width / 5 * 2, height / 5 * 2, width / 5, height / 5, null); // logo.png自行设置
g2.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
g2.draw(new RoundRectangle2D.Float(width / 5 * 2, height / 5 * 2, width / 5, height / 5, 20, 20));
g2.dispose();
g2.setColor(Color.white);
g2.setBackground(Color.white);
bufferedImage.flush();
ImageIO.write(bufferedImage,"png",os);
//OutputStream out = new FileOutputStream("D:\\logo\\abb.png"); //转码前保存图片文件到指定目录
//out.write(os.toByteArray());
resultImage=new String("data:image/png;base64,"+ Base64.encode(os.toByteArray()));
return resultImage;
}catch (Exception e){
e.printStackTrace();
}finally {
if(stream!=null){
stream.flush();
stream.close();
}
}
}
return null;
}
}
2.Controlelr
1 @RequestMapping("/qrcode")
2 public String qrcode(HttpServletRequest request, HttpServletResponse response) {
3 try {
4 QrCodeUtil qrCodeUtil=new QrCodeUtil();
5 String path= ResourceUtils.getURL("classpath:").getPath()+"logo/logo.png";
6 return qrCodeUtil.createQRCode("https://www.cnblogs.com/xikui/",300,300,path);
7 } catch (IOException e) {
8 e.printStackTrace();
9 return "异常";
10 }
11 }
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