java生成二维码带logo

　　　　在线生成二维码工具

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首先引入com.google.zxing的jar包，在pom中：

<!-- 二维码生成工具 -->

<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>core</artifactId>
   <version>3.3.3</version>
</dependency>
<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>javase</artifactId>
   <version>3.3.3</version>
</dependency>

附上二维码生成工具代码，有些方法自行封装。

package com.wty.its.kit;

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.QRCodeReader;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;

/**
 * @author acorn
 * @Title: QRCodeKit
 * @ProjectName QRCodeKit
 * @Description: TODO  二维码生成工具
 * @date 2018/10/2315:06
 */
public class QRCodeKit {

    // 默认编码
    public static final String QRCODE_DEFAULT_CHARSET = "UTF-8";

    // 默认二维码宽度
    public static final int QRCODE_DEFAULT_WIDTH = 400;

    // 默认二维码高度
    public static final int QRCODE_DEFAULT_HEIGHT = 400;

    // 图片文件输出类型 默认PNG
    public static final String DEFAULT_OUT_IMAGE_TYPE = "PNG";

    private static final int BLACK = 0xFF000000;

    private static final int WHITE = 0xFFFFFFFF;


    public static BufferedImage createQRCode(String data){
        return createQRCode(data,QRCODE_DEFAULT_WIDTH,QRCODE_DEFAULT_HEIGHT);
    }

    public static BufferedImage createQRCode(String data, int width, int height){
        return createQRCode(data, QRCODE_DEFAULT_CHARSET, width, height);
    }


    public static BufferedImage createQRCode(String data, String charset, int width, int height) {
        Map<EncodeHintType,Object> hintMap = new HashMap();
        hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hintMap.put(EncodeHintType.CHARACTER_SET, charset);

        return createQRCode(data, charset, hintMap, width, height);
    }

    /**
     *  生成二维码 bufferedImage
     * @param content 二维码内容
     * @param charset 编码
     * @param hintMap 纠错级别
     * @param width   二维码宽度
     * @param heigt   二维码高度
     * @return
     */
    private static BufferedImage createQRCode(String content, String charset, Map hintMap,int width,int heigt){
        BitMatrix bitMatrix;

        try {
            bitMatrix = new MultiFormatWriter().encode(new String(content.getBytes(charset),charset), BarcodeFormat.QR_CODE,width,heigt,hintMap);
            return toBufferedImage(bitMatrix);
        } catch (WriterException e) {
            throw new RuntimeException(e.getMessage());
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage());
        }

    }

    /**
     *  生成位矩阵图片
     * @param bitMatrix
     * @return
     */
    private static BufferedImage toBufferedImage(BitMatrix 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) ? BLACK : WHITE);
            }
        }

        return image;
    }


    /**
     *  生成带logo的二维码
     * @param data
     * @param charset
     * @param hint
     * @param width
     * @param height
     * @param logoFile
     * @return
     */
    public static BufferedImage createQRCodeWithLogo(String data, String charset, Map<EncodeHintType, ?> hint,
                                                     int width, int height, File logoFile) {
        try {
            BufferedImage qrcode = createQRCode(data, charset, hint, width, height);

            //获取画笔
            Graphics2D g = qrcode.createGraphics();

            BufferedImage logo = ImageIO.read(logoFile);


            // logo大小为 二维码的20%大小
            int logoWidth = logo.getWidth(null) > qrcode.getWidth()*2 /10 ? (qrcode.getWidth()*2 /10) : logo.getWidth(null);
            int logoHeight = logo.getHeight(null) > qrcode.getHeight()*2 /10 ? (qrcode.getHeight()*2 /10) : logo.getHeight(null);



            int x = (qrcode.getWidth() - logoWidth) / 2;
            int y = (qrcode.getHeight() - logoHeight) / 2;


            g.drawImage(logo, x, y, logoWidth, logoHeight, null);
            g.setStroke(new BasicStroke(3f));
            g.setColor(Color.WHITE);
            g.drawRoundRect(x, y, logoWidth, logoHeight, 5 ,5);
            

            g.dispose();
            logo.flush();
            qrcode.flush();

            return qrcode;
        } catch (IOException e) {
            throw new RuntimeException(e.getMessage(), e);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static BufferedImage createQRCodeWithLogo(String data, String logoFilePath) {
        return createQRCodeWithLogo(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT, new File(logoFilePath));
    }


    public static BufferedImage createQRCodeWithLogo(String data, File logoFile) {
        return createQRCodeWithLogo(data, QRCODE_DEFAULT_WIDTH, QRCODE_DEFAULT_HEIGHT, logoFile);
    }

    public static BufferedImage createQRCodeWithLogo(String data, int width, int height, File logoFile) {
        return createQRCodeWithLogo(data, QRCODE_DEFAULT_CHARSET, width, height, logoFile);
    }

    public static BufferedImage createQRCodeWithLogo(String data, int width, int height, String logoFilePath) {
        return createQRCodeWithLogo(data, QRCODE_DEFAULT_CHARSET, width, height, new File(logoFilePath));
    }

    public static BufferedImage createQRCodeWithLogo(String data, String charset, int width, int height, File logoFile) {
        Map hint = new HashMap();
        hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hint.put(EncodeHintType.CHARACTER_SET, charset);

        return createQRCodeWithLogo(data, charset, hint, width, height, logoFile);
    }


    /**
     * 输出二维码
     * @param bufferedImage
     * @param formatName
     * @param fileOutputStream
     */
    public static void genQRCode(BufferedImage bufferedImage,String formatName,FileOutputStream fileOutputStream){

        try {
            ImageIO.write(bufferedImage,formatName,fileOutputStream);

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    /**
     *  输出流
     * @param bufferedImage
     * @param fileOutputStream
     */
    public static void genQRCode(BufferedImage bufferedImage,FileOutputStream fileOutputStream){
        genQRCode(bufferedImage,DEFAULT_OUT_IMAGE_TYPE,fileOutputStream);
    }

    /**
     * 输出文件对象
     * @param bufferedImage
     * @param outFile
     */
    public static void genQRCode(BufferedImage bufferedImage,File outFile){

        try {

            if (!outFile.exists()){
                outFile.createNewFile();
            }

            genQRCode(bufferedImage,new FileOutputStream(outFile));
            System.out.println("生成二维码路径:" + outFile.getAbsolutePath());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 文件名称输出
     * @param bufferedImage
     * @param outQrcodePath
     */
    public static void genQRCode(BufferedImage bufferedImage,String outQrcodePath){
        genQRCode(bufferedImage,new File(outQrcodePath));
    }

    /**
     *
     * @param content 二维码内容
     * @param outQrcodePath 二维码文件输出路径
     */
    public static void genQRCode(String content,String outQrcodePath){
        genQRCode(createQRCode(content),outQrcodePath);
    }

    public static void genQRCode(String content,int width,int height,String outQrcodePath){
        genQRCode(createQRCode(content,width,height),outQrcodePath);
    }

    /**
     * 带logo 二维码
     * @param content 二维码内容
     * @param logoPath logo路径
     * @param outQrcodePath 图片输出路径
     */
    public static void genQRCodeWithLogo(String content,String logoPath,String outQrcodePath){
        genQRCode(createQRCodeWithLogo(content,logoPath),outQrcodePath);
    }

    /**
     * 带logo 二维码
     * @param content 二维码内容
     * @param width  二维码宽度
     * @param height 二维码高度
     * @param logoPath logo 路径
     * @param outQrcodePath 二维码图片输出路径
     */
    public static void genQRCodeWithLogo(String content,int width,int height,String logoPath,String outQrcodePath){
        genQRCode(createQRCodeWithLogo(content,width,height,logoPath),outQrcodePath);
    }

    /**
     * 读二维码内容
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static String readQrCode(InputStream inputStream){
        //从输入流中获取字符串信息
        BufferedImage image = null;
        try {
            image = ImageIO.read(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //将图像转换为二进制位图源
        LuminanceSource source = new BufferedImageLuminanceSource(image);

        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        QRCodeReader reader = new QRCodeReader();
        Result result = null ;
        try {
            result = reader.decode(bitmap);
        } catch (ReaderException e) {
            e.printStackTrace();
        }

        return result.getText();
    }

    /**
     * 根据二维码文件对象读取内容
     * @param qrcodeFile
     * @return
     */
    public static String readQrCode(File qrcodeFile){
        String text = null;


        try {
           text =  readQrCode(new FileInputStream(qrcodeFile));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        return text;
    }

    /**
     * 根据二维码文件路径读取内容
     * @param qrcodeFilePath
     * @return
     */
    public static String readQrCode(String qrcodeFilePath){

        return readQrCode(new File(qrcodeFilePath));
    }

    /**
     * 创建目录
     *
     * @param descDirName 目录名,包含路径
     * @return 如果创建成功，则返回true，否则返回false
     */
    public static boolean createDirectory(String descDirName) {
        String descDirNames = descDirName;
        if (!descDirNames.endsWith(File.separator)) {
            descDirNames = descDirNames + File.separator;
        }
        File descDir = new File(descDirNames);
        if (descDir.exists()) {
            System.out.println("目录 " + descDirNames + " 已存在!");
            return false;
        }
        // 创建目录
        if (descDir.mkdirs()) {
            System.out.println("目录 " + descDirNames + " 创建成功!");
            return true;
        } else {
            System.out.println("目录 " + descDirNames + " 创建失败!");
            return false;
        }

    }

    public static void main(String[] args) {

        // genQRCode("i love acorn...","F:\\ceshi.png");

        // genQRCode("i love acorn ...",500,500,"F:\\ceshi.png");

        // genQRCodeWithLogo("i love acorn ...","F:\\logo.jpg","F:\\ceshi.png");

        genQRCodeWithLogo("i love acorn ...",400,400,"F:\\logo.jpg","F:\\ceshi.png");

        String text = readQrCode("F:\\ceshi.png");
        System.out.println(text);
    }
}