java中怎么实现生成二维码,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
如果是maven项目要在项目中添加依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.0</version> </dependency>
package com.aigyun.config; import com.aigyun.constant.StringUtils; import com.aigyun.entity.DeviceUavInfo; import com.alibaba.fastjson.JSONObject; 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 com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import com.swetake.util.Qrcode; import lombok.extern.slf4j.Slf4j; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; import java.nio.file.FileSystems; import java.nio.file.Path; import java.time.LocalDateTime; import java.util.HashMap; import java.util.Map; import java.util.Objects; import java.util.UUID; public class QCodeUtil { private static final int QRCOLOR = 0xFF000000; // 默认是黑色 private static final int BGWHITE = 0xFFFFFFFF; // 背景颜色 // 用于设置QR二维码参数 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); } }; /** * java绘制只包含内容的二维码 * * @param content * @param imgPath */ public static void getQrCodeImg(String content, String imgPath) { int width = 300; int height = 300; Qrcode qrcode = new Qrcode(); qrcode.setQrcodeErrorCorrect('M'); // 设置纠错级别(级别有:L(7%) M(15%) Q(25%) H(30%) ) qrcode.setQrcodeEncodeMode('B'); // 设置编码方式 qrcode.setQrcodeVersion(7); // 设置二维码版本(版本有 1-40个,) // 1.设置图片大小(BufferedImage.TYPE_INT_RGB:利用三原色绘制二维码) BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D gs = img.createGraphics(); // 创建画笔 gs.setBackground(Color.WHITE); // 设置背景为白色 gs.clearRect(0, 0, width, height); // 设置一个矩形(四个参数分别为:开始绘图的x坐标,y坐标,图片宽,图片高) gs.setColor(Color.BLACK); // 设置二维码图片的颜色 byte[] bt = null; // 把内容转换字节数组 try { bt = content.getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } int py = 4; // 偏移量 boolean[][] code = qrcode.calQrcode(bt); // 开始准备画图 for (int i = 0; i < code.length; i++) { for (int j = 0; j < code[i].length; j++) { if (code[j][i]) { // 四个参数(画图的起始x和y位置,每个小模块的宽和高(二维码是有一个一个的小模块构成的)); gs.fillRect(j * 6 + py, i * 6 + py, 6, 6); } } } // 画图 try { ImageIO.write(img, "png", new File(imgPath)); System.out.println("OK!"); } catch (IOException e) { System.out.println("二维码异常。。。。。"); e.printStackTrace(); } } public static String decode(String filepath) { try { BufferedImage bufferedImage = ImageIO.read(new FileInputStream(filepath)); LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); HashMap<DecodeHintType, Object> decodeHints = new HashMap<DecodeHintType, Object>(); decodeHints.put(DecodeHintType.CHARACTER_SET, "UTF-8"); Result result = new MultiFormatReader().decode(bitmap, decodeHints); return result.getText(); } catch (NotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } /** * zxing生成带logo的二维码 * * @param logoFile * @param codeFile * @param qrUrl * @param note */ public static boolean drawLogoQRCode(final File logoFile, File codeFile, final String qrUrl, final String note, final int width, final int height) { MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); BitMatrix bm = null; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); ; try { // 参数顺序分别为:编码内容,编码类型,生成图片宽度,生成图片高度,设置参数 bm = multiFormatWriter.encode(qrUrl, BarcodeFormat.QR_CODE, width, height, hints); } catch (WriterException we) { we.printStackTrace(); return false; } // 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); } } //绘制图片 Graphics2D g = image.createGraphics(); try { BufferedImage logo = ImageIO.read(logoFile); g.drawImage(logo, width * 2 / 5, height * 2 / 5, width * 2 / 10, height * 2 / 10, null); g.dispose(); logo.flush(); } catch (IOException e) { e.printStackTrace(); return false; } // 自定义文本描述 if (StringUtils.isNotEmpty(note)) { // 新的图片,把带logo的二维码下面加上文字 BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR); Graphics2D outg = outImage.createGraphics(); // 画二维码到新的面板 outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null); // 画文字到新的面板 outg.setColor(Color.BLACK); outg.setFont(new Font("楷体", Font.BOLD, 30)); // 字体、字型、字号 int strWidth = outg.getFontMetrics().stringWidth(note); if (strWidth > 399) { //长度过长就截取前面部分 // 长度过长就换行 String note1 = note.substring(0, note.length() / 2); String note2 = note.substring(note.length() / 2, note.length()); int strWidth2 = outg.getFontMetrics().stringWidth(note1); int strWidth3 = outg.getFontMetrics().stringWidth(note2); outg.drawString(note1, 200 - strWidth2 / 2, height + (outImage.getHeight() - height) / 2 + 12); BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR); Graphics2D outg2 = outImage2.createGraphics(); outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null); outg2.setColor(Color.BLACK); outg2.setFont(new Font("宋体", Font.BOLD, 30)); // 字体、字型、字号 outg2.drawString(note2, 200 - strWidth3 / 2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight()) / 2 + 5); outg2.dispose(); outImage2.flush(); outImage = outImage2; } else { outg.drawString(note, 200 - strWidth / 2, height + (outImage.getHeight() - height) / 2 + 12); // 画文字 } outg.dispose(); outImage.flush(); image = outImage; } image.flush(); try { ImageIO.write(image, "png", codeFile); // TODO } catch (IOException e) { e.printStackTrace(); return false; } return true; } public static void main(String[] args) { // JSONObject jsonObject = new JSONObject(); // jsonObject.put("reg_id", 12123); // getQrCodeImg(jsonObject.toJSONString(), "f:/qrcode/test1.jpg"); // //encode(jsonObject.toJSONString(), "f:/qrcode/test.jpg"); // File logoFile = new File("f:/qrcode/512x512bb.jpg"); // File codeFile = new File("f:/qrcode/test.png"); // drawLogoQRCode(logoFile, codeFile, jsonObject.toJSONString(),"扫一扫查看配置参数"); // // String content = decode("f:/qrcode/test.jpg"); // System.out.println(content); System.out.println(UUID.randomUUID().toString()); } }
看完上述内容是否对您有帮助呢?如果还想对相关知识有进一步的了解或阅读更多相关文章,请关注亿速云行业资讯频道,感谢您对亿速云的支持。
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。