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将链接生成二维码

2021-11-02 11:31:39  阅读:153  来源: 互联网

标签:String int image param 生成 二维码 new 链接


/**
 * 二维码生成解析工具类
 **/

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.OutputStream;
import java.util.Hashtable;

/**
 * 二维码生成解析工具类
 */
public class QRCodeUtil {

    /**
     * 编码格式,采用utf-8
     **/
    private static final String UNICODE = "utf-8";

    /**
     * 图片格式
     **/
    private static final String FORMAT = "JPG";

    /**
     * 二维码宽度,单位:像素pixels
     **/
    private static final int QRCODE_WIDTH = 300;

    /**
     * 二维码高度,单位:像素pixels
     **/
    private static final int QRCODE_HEIGHT = 300;

    /**
     * LOGO宽度,单位:像素pixels
     **/
    private static final int LOGO_WIDTH = 100;

    /**
     * LOGO高度,单位:像素pixels
     **/
    private static final int LOGO_HEIGHT = 100;

    /**
     * 生成二维码图片
     *
     * @param content      二维码内容
     * @param logoPath     图片地址
     * @param needCompress 是否压缩
     * @return
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
        // 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        //设置zxing的二维码容错率容错率级别:L 7%, M 15%, Q 25%, H 30%
        //如果二维码地址比较短,推荐H,因为容错率高,容错率越高,越容易被快速扫描
        //如果二维码地址比较长,生成的二维码比较密,推荐L,因为这样生成的二维码比较稀疏,容易扫描
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, UNICODE);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,
                hints);
        //调用去除白边方法
        //bitMatrix = deleteWhite(bitMatrix);
        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
        QRCodeUtil.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 Exception
     */
    private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
        File file = new File(logoPath);
        if (!file.exists()) {
            throw new Exception("logo file not found.");
        }
        Image src = ImageIO.read(new File(logoPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        // 压缩LOGO
        if (needCompress) {
            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();
            // 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_WIDTH - width) / 2;
        int y = (QRCODE_HEIGHT - 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(内嵌LOGO)
     * 调用者指定二维码文件名
     *
     * @param content      二维码的内容
     * @param logoPath     中间图片地址
     * @param destPath     存储路径
     * @param fileName     文件名称
     * @param needCompress 是否压缩
     * @return
     * @throws Exception
     */
    public static void encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        //文件名称通过传递
        fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length())
                + "." + FORMAT.toLowerCase();
        ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
    }

    /**
     * 以流的形式输出生成二维码
     *
     * @param content      二维码的内容
     * @param imgPath      图片地址
     * @param output       OutputStream
     * @param needCompress 是否压缩
     * @return void
     * @throws Exception
     **/
    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        ImageIO.write(image, FORMAT, output);
    }


    /**
     * 创建文件夹, 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
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    /**
     * 解析二维码
     *
     * @param path 二维码图片路径
     * @return String 二维码内容
     * @throws Exception
     */
    public static String decode(String path) throws Exception {
        File file = new File(path);
        BufferedImage 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, UNICODE);
        result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }

    /**
     * 强制将白边去掉
     *
     * @param matrix
     * @return 裁剪后的二维码(实际二维码的大小)
     * @explain 虽然生成二维码时,已经将margin的值设为了0,但是在实际生成二维码时有时候还是会生成白色的边
     * 白边的生成还与设定的二维码的宽、高及二维码内容的多少(内容越多,生成的二维码越密集)有关;
     * 因为是在生成二维码之后,才将白边裁掉,所以裁剪后的二维码(实际二维码的宽、高)肯定不是设置的值了
     */
    private static BitMatrix deleteWhite(BitMatrix matrix) {
        int[] rec = matrix.getEnclosingRectangle();
        int resWidth = rec[2] + 1;
        int resHeight = rec[3] + 1;
        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
        resMatrix.clear();
        for (int i = 0; i < resWidth; i++) {
            for (int j = 0; j < resHeight; j++) {

                if (matrix.get(i + rec[0], j + rec[1])) {
                    resMatrix.set(i, j);
                }
            }
        }
        int width = resMatrix.getWidth();
        int height = resMatrix.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++) {
                // 0-黑色;255-白色
                image.setRGB(x, y, resMatrix.get(x, y) ? 0 : 255);
            }
        }

        return resMatrix;
    }


    /**
     * 测试
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String text = "http://www.baidu.com";
        //不含Logo
        QRCodeUtil.encode(text, null, "D:\\temp\\", "qrcode", true);
        //含Logo,指定二维码图片名
        QRCodeUtil.encode(text, "D:\\aa.png", "d:\\temp\\", "qrcode1", true);
        System.out.println(QRCodeUtil.decode("d:\\temp\\qrcode1.jpg"));
    }
}

标签:String,int,image,param,生成,二维码,new,链接
来源: https://blog.csdn.net/weixin_50391597/article/details/121096907

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