用Java生成二维码并附带文字信息

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.3.0</version>
    </dependency>

@Data
public class QRCodeUser {
    private String userName;
    private String userCode;
    private String url;     //二维码跳转的链接
}

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.*;
import java.util.List;
import javax.imageio.ImageIO;

import com.demo.demo.mapper.AssetsVo;
import com.google.zxing.BarcodeFORMat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.lang3.StringUtils;




public class QRCodeUtil {

    //设置默认参数，可以根据需要进行修改
    private static final int QRCOLOR = 0xFF000000; // 默认是黑色
    private static final int BGWHITE = 0xFFFFFFFF; // 背景颜色
    private static final int WIDTH = 180; // 二维码宽
    private static final int HEIGHT = 180; // 二维码高

    //设置高度常量
    private static final int  userNameHigh = 10;
    private static final int userCodehigh = -20;

	//设置字体宽度
    private static final int strWidth = 130; 


    
    private static Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>() {
        private static final long serialVersionUID = 1L;
        {
            put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 设置QR二维码的纠错级别（H为最高级别）具体级别信息
            put(EncodeHintType.CHARACTER_SET, "utf-8");// 设置编码方式
            put(EncodeHintType.MARGIN, 0);
        }
    };


    
    private static BufferedImage createQr(QRCodeUser qrCodeUser, Font font) throws WriterException{
        //设置二维码旁边的文字信息
        String userName = "员工姓名:"+qrCodeUser.getUserName();
        String userCode = "員工工號:"+qrCodeUser.getUserName();
        String qrurl = qrCodeUser.getUrl();    //这里以百度为例

        
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();

        
        BitMatrix bm = multiFormatWriter.encode(qrurl, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
        //创建一个图片缓冲区存放二维码图片
        BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
        for (int x = 0; x < WIDTH; x++) {
            for (int y = 0; y < HEIGHT; y++) {
                image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
            }
        }
        int height = image.getHeight();

        // ------------------------------------------自定义文本描述-------------------------------------------------
        if (StringUtils.isNotEmpty(qrCodeUser.getUserCode())) {
            //在内存创建图片缓冲区  这里设置画板的宽高和类型
            BufferedImage outImage = new BufferedImage(600, 350, BufferedImage.TYPE_4BYTE_ABGR);

            //创建画布
            Graphics2D outg = outImage.createGraphics();

            // 在画布上画上二维码  X轴Y轴，宽度高度
            outg.drawImage(image, 10, 30, image.getWidth(), image.getHeight(), null);

            // 画文字到新的面板
            outg.setColor(Color.BLACK);
             // 字体、字型、字号
            outg.setFont(font);

            //获取字体宽度
            int userNameWidth = outg.getFontMetrics().stringWidth(userName);
            int userCodeWidth = outg.getFontMetrics().stringWidth(userCode);

			//drawString(文字信息、x轴、y轴)方法根据参数设置文字的坐标轴 ，根据需要来进行调整
            outg.drawString(userName, 300 - userNameWidth / 2, height - userNameHigh);    //   员工名字
            outg.drawString(userCode, 300 - userCodeWidth / 2, height - userCodehigh);      //   员工工号
            //  例： outg.drawString(depatmentName,  65 - strWidth / 2, height + (outImage.getHeight() - height) / 2 - h3); 根据需求自行计算需要的宽高

            outg.dispose();
            outImage.flush();
            image = outImage;
        }
        image.flush();
        return image;
    }

}

 
    public void drawLogoQRCode(QRCodeUser qrCodeUser) {

        FileOutputStream fileOutputStream = null;

        try {
            fileOutputStream = new FileOutputStream("D:"+ File.separator+"二维码" + qrCodeUser.getUserCode() + ".png");  //保存路径输出流，将图片输出到指定路径
            Font fontChinese = new Font("黑体",  Font.BOLD, 28);
            BufferedImage image = QRCodeUtil.createQr(qrCodeUser,fontChinese);

            boolean crateQRCode = ImageIO.write(image, "png", fileOutputStream);

        }catch (WriterException | IOException e) {
            log.error("二维码写入IO流异常",e);
        }finally {
            try {
                if (null != fileOutputStream){
                    fileOutputStream.flush();
                    fileOutputStream.close();
                }
            }catch (IOException ioe){
                log.error("二维码关流异常",ioe);
            }
        }
    }

    public void drawLogoQRCode(List<QRCodeUser> qrCodeUserList) {

        FileOutputStream fileOutputStream = null;
		//咱们简单一点，直接循环调用
        try {	
        	for(QRCodeUser qrCodeUser:qrCodeUserList){
	            fileOutputStream = new FileOutputStream("D:"+ File.separator+"二维码" + qrCodeUser.getUserCode() + ".png");  //保存路径输出流，将图片输出到指定路径
	            Font fontChinese = new Font("黑体",  Font.BOLD, 28);

		
	            //返回的image就是二维码图片，可以根据需要进行后续的处理，比如全都写入指定文件夹进行压缩或者写入PDF文件
	            BufferedImage image = QRCodeUtil.createQr(qrCodeUser,fontChinese);
	
				//写出到指定路径
	            boolean crateQRCode = ImageIO.write(image, "png", fileOutputStream);

			}
        }catch (WriterException | IOException e) {
            log.error("二维码写入IO流异常",e);
        }finally {
            try {
                if (null != fileOutputStream){
                    fileOutputStream.flush();
                    fileOutputStream.close();
                }
            }catch (IOException ioe){
                log.error("二维码关流异常",ioe);
            }
        }
    }

<dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.5.13</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.itextpdf/itext-asian -->
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itext-asian</artifactId>
      <version>5.2.0</version>
    </dependency>

public static void drawLogoQRCode(OutputStream outputStream, QrCodeUser qrCodeUser) {

        try {
        	Font fontChinese = new Font("黑体",  Font.BOLD, 28);
            BufferedImage image = createQr(qrCodeUser,fontChinese);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();  //字节数组输出流
            boolean createQRCode = ImageIO.write(image, "png", byteArrayOutputStream);
            if(!createQRCode){
				log.error("二维码写入输出流失败");
			}
         
            
            Document document = new Document(PageSize.A4, 0, 0, 0, 0);
            PdfWriter.getInstance(document, outputStream);  //写出pdf
            document.open();    //打开文件

            
            com.lowagie.text.Image image2 = com.lowagie.text.Image.getInstance(byteArrayOutputStream.toByteArray());
            float documentWidth = document.getPageSize().getWidth() - document.leftMargin() - document.rightMargin();
            float documentHeight = documentWidth / 300 * 80;// 重新设置宽高
            image2.scaleAbsolute(documentWidth, documentHeight);// 重新设置宽高
            document.add(image2);
            document.close();   //关闭文件

            byteArrayOutputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

linux系统或者Docker发布的项目中，不包含中文字体，会导致中文乱码，所以PDF中的中文不能显示

Linux系统中路径  /usr/share/fonts/   下是字体文件，复制windows本地的字体文件到这里面就可以，一般使用宋体
Docker系统中，需要配置

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