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这篇文章给大家介绍Zxing中怎么生成二维码并返回,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
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com.google.zxing core 3.4.0 com.google.zxing javase 3.4.0
package com.sunlands.feo.school.candlestick.utils; 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 org.springframework.stereotype.Component; 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.OutputStream; import java.util.Hashtable; /** * @author dongxie */ @Component public class QrCodeUtils { private static final String CHARSET = "UTF-8"; private static final String FORMAT_NAME = "JPG"; /** * 二维码尺寸 */ private static final int QRCODE_SIZE = 300; /** * LOGO宽度 */ private static final int WIDTH = 60; /** * LOGO高度 */ private static final int HEIGHT = 60; /** * 创建二维码图片 * * @param content 内容 * @param logoPath logo * @param isCompress 是否压缩Logo * @return 返回二维码图片 * @throws WriterException e * @throws IOException BufferedImage */ public static BufferedImage createImage(String content, String logoPath, boolean isCompress) throws WriterException, IOException { Hashtablehints = new Hashtable<>(); 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, isCompress); return image; } /** * 添加Logo * * @param source 二维码图片 * @param logoPath Logo * @param isCompress 是否压缩Logo * @throws IOException void */ private static void insertImage(BufferedImage source, String logoPath, boolean isCompress) throws IOException { File file = new File(logoPath); if (!file.exists()) { return; } Image src = ImageIO.read(new File(logoPath)); int width = src.getWidth(null); int height = src.getHeight(null); // 压缩LOGO if (isCompress) { if (width > WIDTH) { width = WIDTH; } if (height > HEIGHT) { height = HEIGHT; } Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); // 绘制缩小后的图 g.drawImage(image, 0, 0, null); 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(); } /** * 生成带Logo的二维码 * * @param content 二维码内容 * @param logoPath Logo * @param destPath 二维码输出路径 * @param isCompress 是否压缩Logo * @throws Exception void */ public static void create(String content, String logoPath, String destPath, boolean isCompress) throws Exception { BufferedImage image = QrCodeUtils.createImage(content, logoPath, isCompress); mkdirs(destPath); ImageIO.write(image, FORMAT_NAME, new File(destPath)); } /** * 生成不带Logo的二维码 * * @param content 二维码内容 * @param destPath 二维码输出路径 */ public static void create(String content, String destPath) throws Exception { QrCodeUtils.create(content, null, destPath, false); } /** * 生成带Logo的二维码,并输出到指定的输出流 * * @param content 二维码内容 * @param logoPath Logo * @param output 输出流 * @param isCompress 是否压缩Logo */ public static void create(String content, String logoPath, OutputStream output, boolean isCompress) throws Exception { BufferedImage image = QrCodeUtils.createImage(content, logoPath, isCompress); ImageIO.write(image, FORMAT_NAME, output); } /** * 生成不带Logo的二维码,并输出到指定的输出流 * * @param content 二维码内容 * @param output 输出流 * @throws Exception void */ public static void create(String content, OutputStream output) throws Exception { QrCodeUtils.create(content, null, output, false); } /** * 二维码解析 * * @param file 二维码 * @return 返回解析得到的二维码内容 * @throws Exception String */ public static String parse(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 hints = new Hashtable (); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); return result.getText(); } /** * 二维码解析 * * @param path 二维码存储位置 * @return 返回解析得到的二维码内容 * @throws Exception String */ public static String parse(String path) throws Exception { return QrCodeUtils.parse(new File(path)); } /** * 判断路径是否存在,如果不存在则创建 * * @param dir 目录 */ public static void mkdirs(String dir) { if (dir != null && !"".equals(dir)) { File file = new File(dir); if (!file.isDirectory()) { file.mkdirs(); } } } }
package com.jiafly.blueberry.controller; import com.jiafly.blueberry.common.utils.QrCodeUtils; import org.apache.tomcat.util.http.fileupload.IOUtils; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import javax.imageio.ImageIO; import javax.imageio.stream.ImageOutputStream; import javax.servlet.http.HttpServletResponse; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.io.OutputStream; /** * 二维码 * * @author dongxie */ @RestController @RequestMapping(path = "/qrcode") public class QrCodeController { @GetMapping(path = "/create") public void image(HttpServletResponse response, @RequestParam("content") String content) { try { BufferedImage bufferedImage = QrCodeUtils.createImage(content, null, false); responseImage(response, bufferedImage); } catch (Exception e) { // 异常自行处理,应用程序切忌直接打印堆栈日志,难定位 e.printStackTrace(); } } /** * 设置 可通过postman 或者浏览器直接浏览 * * @param response response * @param bufferedImage bufferedImage * @throws Exception e */ public void responseImage(HttpServletResponse response, BufferedImage bufferedImage) throws Exception { ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream); ImageIO.write(bufferedImage, "jpeg", imageOutput); InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray()); OutputStream outputStream = response.getOutputStream(); response.setContentType("image/jpeg"); response.setCharacterEncoding("UTF-8"); IOUtils.copy(inputStream, outputStream); outputStream.flush(); } }
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