【二维码的创建、底部添加文字以及文字乱码】-Toy模板网

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首先引入maven依赖
依赖1
< dependency >
< groupId>com.google.zxing< /groupId>
< artifactId>javase< /artifactId>
< version>3.3.1< /version>
< /dependency> .
依赖2
< dependency>
< groupId>com.google.zxing< /groupId>
< artifactId>core< /artifactId>
< version>3.3.1< /version>
< /dependency>

上传fastDFS

public String creatQrCode(String path, String name) {
        String qrPath = "";
        try {
            //获取二维码图片字节流
            byte[] bytes = getQrCodeByte(path, name);
            InputStream inputStream = new ByteArrayInputStream(bytes);
            //通过fastDFS保存最终图片
            Map qrMap = fastDFSConfig.uploadFilePng(inputStream);
            qrPath = qrMap.get("filePath").toString();
            if (ObjectUtils.isEmpty(qrPath)) {
                throw BizException.warp(ResultCode.VALIDATE_FAILED.build("生成二维码失败"));
            }
        } catch (Exception e) {
            throw BizException.warp(ResultCode.VALIDATE_FAILED.build("生成二维码失败"));
        }
        return qrPath;
    }

获取二维码流

private byte[] getQrCodeByte(String path, String name) {
        byte[] bytes = null;
        try {
            BufferedImage image = createQrCode(path, 300);
            BufferedImage bufferedImage = addNote(image, name);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(byteArrayOutputStream);
            ImageIO.write(bufferedImage, "jpg", imageOutputStream);
            bytes = byteArrayOutputStream.toByteArray();
        } catch (IOException e) {
            throw BizException.warp(ResultCode.VALIDATE_FAILED.build("生成二维码失败"));
        }
        return bytes;
    }

创建二维码

 private BufferedImage createQrCode(String content, int qrCodeSize) {
     try {
         //设置二维码纠错级别
         Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<>();
         hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
         QrCodeWriter qrCodeWriter = new QRCodeWriter();
         BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
         int width = bitMatrix.getWidth();
         int height = bitMatrix.getHeight();
         BufferedImage image = new BufferedImage(width - 65, height - 65, BufferedImage.TYPE_INT_RGB);
         Graphics2D graphics2D = image.createGraphics();
         graphics2D.setColor(Color.white);
         graphics2D.fillRect(0, 0, width, height);
         graphics2D.setColor(Color.BLACK);
         //保存图像
         for (int i = 0; i < width; i++) {
             for (int j = 0; j < width; j++) {
                 if (bitMatrix.get(i, j)) {
                     graphics2D.fillRect(i - 33, j - 33, 2, 2);
                 }
             }
         }
         return image;
     } catch (Exception e) {
         e.printStackTrace();
         return null;
     }
 }

底部添加文字说明

 private BufferedImage addNote(BufferedImage image, String note) {
      int a = 0;
      String reg1 = "[\u4e00-\u9fa5]";
      String reg2 = "[A-Z]";
      String reg3 = "[a-z]";
      String reg4 = "[0-9]";
      char[] charArr = note.toCharArray();
      String[] strArr = new String[charArr.length];
      for (int i = 0; i < charArr.length; i++) {
          strArr[i] = String.valueOf(charArr[i]);
          if (strArr[i].matches(reg1)) {
              a = a + 19;
          } else if (strArr[i].matches(reg4)) {
              a = a + 11;
          } else if (strArr[i].matches(reg2) || strArr[i].matches(reg3)) {
              a = a + 9;
          } else {
              a = a + 5;
          }
      }
      Image src = image.getScaledInstance(300, 300, Image.SCALE_DEFAULT);
      BufferedImage tag;
      //最下层黑边
      if (a < 300) {
          tag = new BufferedImage(300, 322, BufferedImage.TYPE_INT_RGB);
      } else {
          tag = new BufferedImage(300, 345, BufferedImage.TYPE_INT_RGB);
      }
      Graphics g1 = tag.getGraphics();
      g1.setColor(Color.white);
      Graphics2D g2 = tag.createGraphics();//设置文字
      Font font = new Font("Default", Font.BOLD, 18);
      g2.setFont(font);
      g2.setColor(Color.BLACK);
      if (a < 300) {
          g1.fillRect(0, 300, 300, 22);
          g2.drawString(note, (300 - a) / 2 - 4 < 0 ? 0 : (300 - a) / 2 - 4, 300 + font.getSize());
      } else {
          g1.fillRect(0, 300, 300, 45);
          g2.drawString(note, (300 - a) / 2 - 4 < 0 ? 0 : (300 - a) / 2 - 4, 300 + font.getSize());
          g2.drawString(note.substring(16, note.length()), (300 - (a - 300)) / 2, 300 + font.getSize() * 2 + 4);
      }
      g1.drawImage(src, 0, 0, null);
      g1.dispose();
      g2.dispose();
      image = tag;
      image.flush();
      return image;
  }

底部文字中文乱码问题：
【二维码的创建、底部添加文字以及文字乱码】

解决思路：~~~~~~~~~~~~~~~~~~~
1.看一下代码
2.部署服务器的编码问题
（1）查看java是否存在 java -version
(2) which java
【二维码的创建、底部添加文字以及文字乱码】
进入到bin的目录下
cd /usr/bin
ll

看jre下面是否有fonts文件夹，没有的话，新建一个
cd /etc/alternatives/jre/lib/fonts/fallback/simsun.ttc
将ttf文件导入到linux系统中，如上路径
simsun.ttc （文字包）↓
可在本地电脑C盘 Windows\Fonts中获取
这里是一个ttc文件，需要修改文件后缀，改为ttf，才可以扔到linux中文章来源地址https://www.toymoban.com/news/detail-402803.html