zxing生成二维码的方法是什么

本篇内容主要讲解"zxing生成二维码的方法是什么"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"zxing生成二维码的方法是什么"吧!

POM

   com.google.zxing   core   3.1.0   com.google.zxing   javase   3.1.0

utils

package com.egl.utils;import java.awt.BasicStroke;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Shape;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.OutputStream;import java.util.Hashtable;import java.util.Random;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.BinaryBitmap;import com.google.zxing.DecodeHintType;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatReader;import com.google.zxing.MultiFormatWriter;import com.google.zxing.Result;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;/** * lee */public class QRCodeUtil {    private static final String CHARSET = "utf-8";    private 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;    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {        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        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);        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(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 = QRCodeUtil.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 = QRCodeUtil.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 QRCodeUtil.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 QRCodeUtil.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 QRCodeUtil.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 = QRCodeUtil.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 {        QRCodeUtil.encode(content, null, output, false);    }    /**     * 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 hints = new Hashtable();        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 QRCodeUtil.decode(new File(path));    }    public static void main(String[] args) throws Exception {        String text = "https://my.oschina.net/u/3551274";        //不含Logo        //QRCodeUtil.encode(text, null, "e:\\", true);        //含Logo，不指定二维码图片名        //QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", true);        //含Logo，指定二维码图片名        QRCodeUtil.encode(text, "e:\\1.jpg", "e:\\", "qrcode", true);    }}

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