Java Spring boot实现生成二维码
目录
- 一、引入springboot依赖:
- 二、工具类代码:
- 三、调用工具类生成二维码
- 1、将链接生成二维码图片并保存到指定路径
- 2、将链接生成二维码直接显示在页面
- 3、将以get请求传参链接生成二维码
- 总结
一、引入spring boot依赖:
<!--引入生成二维码的依赖--> <!-- https://mvnrepository.com/artifact/com.google.zxing/core --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> <!-- https://mvnrepository.com/artifact/com.google.zxing/javase --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.0</version> </dependency>
二、工具类代码:
import com.google.zxing.*; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import javax.imageio.ImageIO; import java.awt.*; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Hashtable; /** * 二维码生成工具类 */ public class QrCodeUtils { private static final String CHARSET = "utf-8"; public static final String FORMAT = "JPG"; // 二维码尺寸 private static final int QRCODE_SIZE = 300; // LOGO宽度 private static final int LOGO_WIDTH = 60; // LOGO高度 private static final int LOGO_HEIGHT = 60; /** * 生成二维码 * * @param content 二维码内容 * @param logoPath logo地址 * @param needCompress 是否压缩logo * @return 图片 * @throws Exception */ public static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception { Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>(); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hints.put(EncodeHintType.CHARACTER_SET, CHARSET); hints.put(EncodeHintType.MARGIN, 1); BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints); int width = bitMatrix.getWidth(); int height = bitMatrix.getHeight(); 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) ? 0xFF000000 : 0xFFFFFFFF); } } if (logoPath == null || "".equals(logoPath)) { return image; } // 插入图片 QrCodeUtils.insertImage(image, logoPath, needCompress); return image; } /** * 插入LOGO * * @param source 二维码图片 * @param logoPath LOGO图片地址 * @param needCompress 是否压缩 * @throws IOException */ private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception { File file = new File(logoPath); if (!file.exists()) { System.err.println(""+logoPath+" 该文件不存在!"); return; } Image src = ImageIO.read(new File(logoPath)); int width = src.getWidth(null); int height = src.getHeight(null); if (needCompress) { // 压缩LOGO if (width > LOGO_WIDTH) { width = LOGO_WIDTH; } if (height > LOGO_HEIGHT) { height = LOGO_HEIGHT; } Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); src = image; } // 插入LOGO Graphics2D graph = source.createGraphics(); int x = (QRCODE_SIZE - width) / 2; int y = (QRCODE_SIZE - height) / 2; graph.drawImage(src, x, y, width, height, null); Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6); graph.setStroke(new BasicStroke(3f)); graph.draw(shape); graph.dispose(); } /** * 生成二维码(指定路径保存) * * @param content 内容 * @param imgPath logo图片地址(内嵌图片) * @param destPath 生成二维码存放地址 * @param needCompress 是否压缩logo * @throws Exception */ public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception { BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress); mkdirs(destPath); // String file = new Random().nextInt(99999999)+".jpg"; // ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file)); ImageIO.write(image, FORMAT, new File(destPath)); } /** * 生成二维码(直接将二维码以图片输出流返回) * * @param content 内容 * @param imgPath logo图片地址(内嵌图片) * @param needCompress 是否压缩logo * @return * @throws Exception */ public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception { BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress); return image; } public static void mkdirs(String destPath) { File file = new File(destPath); // 当文件夹不存在时,mkdirs会自动创建多层目录,区别于mkdir.(mkdir如果父目录不存在则会抛出异常) if (!file.exists() && !file.isDirectory()) { file.mkdirs(); } } /** * 生成二维码(内嵌LOGO) * * @param content 内容 * @param logoPath LOGO地址 * @param output 输出流 * @param needCompress 是否压缩LOGO * @throws Exception */ public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception { BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress); ImageIO.write(image, FORMAT, output); } /** * 获取指定文件的输入流,获取logo * * @param logoPath 文件的路径 * @return */ public static InputStream getResourceAsStream(String logoPath) { return QrCodeUtils.class.getResourceAsStream(logoPath); } /** * 解析二维码 * * @param file * 二维码图片 * @return * @throws Exception */ public static String decode(File file) throws Exception { BufferedImage image; image = ImageIO.read(file); if (image == null) { return null; } BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Result result; Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); return resultStr; } /** * 解析二维码 * * @param path * 二维码图片地址 * @return * @throws Exception */ public static String decode(String path) throws Exception { return QrCodeUtils.decode(new File(path)); } //测试一: public static void main(String[] args) throws Exception { String text = "https://blog.csdn.net/weixin_43763430"; String logoPath = "D:\\qrCode\\logo.jpg"; String destPath = "D:\\qrCode\\csdn.jpg"; QrCodeUtils.encode(text,logoPath,destPath,true); } }
三、调用工具类生成二维码
1、将链接生成二维码图片并保存到指定路径
工具类中的主方法是指定了二维码链接的内容是博客地址,并保存在D:\qrCode\csdn.jpg,二维码嵌套了头像的图片,期望实现的是生成二维码后被扫码直接进入到博客也没。如若不嵌入头像,直接将logoPath参数设为null。
//测试一: public static void main(String[] args) throws Exception { String text = "https://blog.csdn.net/weixin_43763430"; String logoPath = "D:\\qrCode\\logo.jpg"; String destPath = "D:\\qrCode\\csdn.jpg"; QrCodeUtils.encode(text,logoPath,destPath,true); }
运行该主方法后,可在指定路径中看到生成的二维码图片。
2、将链接生成二维码直接显示在页面
运用spring boot生成二维码无需将保存二维码的图片,只须前端调用springboot接口即可在页面上显示二维码。实现了实时生成二维码。Controller层接口代码示例如下:
@GetMapping("/anon/coupon/qrCodeTest") @ApiOperation(value = "获取二维码") public void qrCodeTest(HttpServletResponse response) throws Exception { String text = "https://blog.csdn.net/weixin_43763430"; String logoPath = "D:\\qrCode\\logo.jpg"; //String destPath = "D:\\qrCode\\csdn.jpg"; QrCodeUtils.encode(text,logoPath,response.getOutputStream(),true); }
打开浏览器访问该接口地址,页面就会显示生成的二维码。扫描二维码即可进入到博客页面。
3、将以get请求传参链接生成二维码
二维码运用到各种业务中,通常需要根据不同用户识别其相对应的内容,如以上示例是访问的博客主页面,如若想根据访问者传递的参数访问博客中特定的文章,文章访问各篇文章是用的get请求方式,即可根据传参实现get请求传入不同参数生成二维码的内容不同。
@GetMapping("/anon/coupon/qrCodeTest") @ApiOperation(value = "获取二维码") public void qrCodeTest(@RequestParam(value = "id") String id,HttpServletResponse response) throws Exception { String text = "https://blog.csdn.net/weixin_43763430/article/details/" + id; String logoPath = "D:\\qrCode\\logo.jpg"; //String destPath = "D:\\qrCode\\csdn.jpg"; QrCodeUtils.encode(text,logoPath,response.getOutputStream(),true); }
用浏览器访问该接口地址,页面生成二维码,用手机扫描二维码即可跳转到博客中该篇文章页面。
总结
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