Zxing中怎么生成二维码并返回

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。

引入 Google Zxing jar包

    com.google.zxing    core    3.4.0    com.google.zxing    javase    3.4.0

工具类

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 */@Componentpublic 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 {        Hashtable hints = 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();            }        }    }}

使用

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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