springboot生成二维码

我们不造轮子,只是轮子的搬运工。(其实最好是造轮子,造比别人好的轮子)

1、 在pom.xml中加入依赖

<!--二维码-->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>

2、添加工具类

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
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;
import java.util.Random;

/**
 * 二维码生成工具类
 *
 * @author user
 * @date 2018/12/5
 */
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 IOException {
        InputStream inputStream = null;
        try {
            inputStream = FileUtils.getResourceAsStream(logoPath);
            Image src = ImageIO.read(inputStream);
            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();
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        } finally {
            if (inputStream != null) {
                inputStream.close();
            }
        }
    }

    /**
     * 生成二维码(内嵌LOGO)
     * 二维码文件名随机,文件名可能会有重复
     *
     * @param content      内容
     * @param logoPath     LOGO地址
     * @param destPath     存放目录
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
        ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
        return fileName;
    }

    /**
     * 生成二维码(内嵌LOGO)
     * 调用者指定二维码文件名
     *
     * @param content      内容
     * @param logoPath     LOGO地址
     * @param destPath     存放目录
     * @param fileName     二维码文件名
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length())
                + "." + FORMAT.toLowerCase();
        ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
        return fileName;
    }

    /**
     * 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)
     *
     * @param destPath 存放目录
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        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 destPath 存储地址
     * @throws Exception
     */
    public static String encode(String content, String logoPath, String destPath) throws Exception {
        return QrCodeUtils.encode(content, logoPath, destPath, false);
    }

    /**
     * 生成二维码
     *
     * @param content      内容
     * @param destPath     存储地址
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static String encode(String content, String destPath, boolean needCompress) throws Exception {
        return QrCodeUtils.encode(content, null, destPath, needCompress);
    }

    /**
     * 生成二维码
     *
     * @param content  内容
     * @param destPath 存储地址
     * @throws Exception
     */
    public static String encode(String content, String destPath) throws Exception {
        return QrCodeUtils.encode(content, null, destPath, false);
    }

    /**
     * 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);
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param output  输出流
     * @throws Exception
     */
    public static void encode(String content, OutputStream output) throws Exception {
        QrCodeUtils.encode(content, null, output, false);
    }
}

应各位要求,这里把FileUtils也贴出来一下:

import org.springframework.web.multipart.MultipartFile;

import java.io.*;

public class FileUtils {
    /**
     * 得到图片字节流 数组大小
     */
    public static byte[] readStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        outStream.close();
        inStream.close();
        return outStream.toByteArray();
    }

    /**
     * 将文件转换成Byte数组
     *
     * @param file
     * @return
     */
    public static byte[] getBytesByFile(File file) {
        try {
            FileInputStream fis = new FileInputStream(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            byte[] data = bos.toByteArray();
            bos.close();
            return data;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * MultipartFile转File
     *
     * @param param
     * @return
     */
    public static File transfer(MultipartFile param) {
        if (!param.isEmpty()) {
            File file = null;
            try {
                InputStream in = param.getInputStream();
                file = new File(param.getOriginalFilename());
                OutputStream out = new FileOutputStream(file);
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
                in.close();
                out.close();
                return file;
            } catch (Exception e) {
                e.printStackTrace();
                return file;
            }
        }
        return null;
    }

    /**
     * 获取指定文件的输入流
     *
     * @param logoPath 文件的路径
     * @return
     */
    public static InputStream getResourceAsStream(String logoPath) {
        return FileUtils.class.getResourceAsStream(logoPath);
    }

    /**
     * 将InputStream写入到File中
     *
     * @param ins
     * @param file
     * @throws IOException
     */
    public void inputstreamtofile(InputStream ins, File file) throws IOException {
        OutputStream os = new FileOutputStream(file);
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
            os.write(buffer, 0, bytesRead);
        }
        os.close();
        ins.close();
    }
}

3、使用

编写一个控制器

/**
 * 二维码
 * @param request
 * @param response
 */
@RequestMapping("/qrcode")
public void qrcode( HttpServletRequest request, HttpServletResponse response) {
    StringBuffer url = request.getRequestURL();
    // 域名
    String tempContextUrl = url.delete(url.length() - request.getRequestURI().length(), url.length()).append("/").toString();

    // 再加上请求链接
    String requestUrl = tempContextUrl + "/index";
    try {
        OutputStream os = response.getOutputStream();
        QrCodeUtils.encode(requestUrl, "/static/images/logo.png", os, true);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

4、测试

访问二维码的请求链接,就可以生成一张漂亮的二维码了。

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