Zxing图片右下角生成二维码

1. <!-- 根据链接生成二维码 -->

   <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>core</artifactId>
      <version>3.2.1</version>
   </dependency>
   <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>javase</artifactId>
      <version>3.3.3</version>
   </dependency>
</dependencies>

　　

---

2.util

package com.xinlianpu.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * Created by Mafy on 2019/5/9.
 */
public class ZxingUtils {
    public static BufferedImage enQRCode(String contents, int width, int height) throws WriterException {
        //定义二维码参数
        final Map<EncodeHintType, Object> hints = new HashMap(8) {
            {
                //编码
                put(EncodeHintType.CHARACTER_SET, "UTF-8");
                //容错级别
                put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
                //边距
                put(EncodeHintType.MARGIN, 0);
            }
        };
        return enQRCode(contents, width, height, hints);
    }


    /**
     * 生成二维码
     *
     * @param contents 二维码内容
     * @param width    图片宽度
     * @param height   图片高度
     * @param hints    二维码相关参数
     * @return BufferedImage对象
     * @throws WriterException 编码时出错
     * @throws IOException     写入文件出错
     */
    public static BufferedImage enQRCode(String contents, int width, int height, Map hints) throws WriterException {
//        String uuid = UUID.randomUUID().toString().replace("-", "");
        //本地完整路径
//        String pathname = path + "/" + uuid + "." + format;
        //生成二维码
        BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
//        Path file = new File(pathname).toPath();
        //将二维码保存到路径下
//        MatrixToImageWriter.writeToPa(bitMatrix, format, file);
//        return pathname;
        return MatrixToImageWriter.toBufferedImage(bitMatrix);
    }


    /**
     * 将图片绘制在背景图上
     *
     * @param backgroundPath 背景图路径
     * @param zxingImage     图片
     * @param x              图片在背景图上绘制的x轴起点
     * @param y              图片在背景图上绘制的y轴起点
     * @return
     */
    public static BufferedImage drawImage(String backgroundPath, BufferedImage zxingImage, int x, int y) throws IOException {
        //读取背景图的图片流
        BufferedImage backgroundImage;
        //Try-with-resources 资源自动关闭,会自动调用close()方法关闭资源,只限于实现Closeable或AutoCloseable接口的类
        URL imgurl = new URL(backgroundPath);
//        try (InputStream imagein = new FileInputStream(backgroundPath)) {
//            backgroundImage = ImageIO.read(imagein);
//        }
        try (InputStream imagein = new BufferedInputStream(imgurl.openStream())) {
            backgroundImage = ImageIO.read(imagein);
        }
        return drawImage(backgroundImage, zxingImage, x, y);
    }


    /**
     * 将图片绘制在背景图上
     *
     * @param backgroundImage 背景图
     * @param zxingImage      图片
     * @param x               图片在背景图上绘制的x轴起点
     * @param y               图片在背景图上绘制的y轴起点
     * @return
     * @throws IOException
     */
    public static BufferedImage drawImage(BufferedImage backgroundImage, BufferedImage zxingImage, int x, int y) throws IOException {
        Objects.requireNonNull(backgroundImage, ">>>>>背景图不可为空");
        Objects.requireNonNull(zxingImage, ">>>>>二维码不可为空");
        //二维码宽度+x不可以超过背景图的宽度,长度同理
        if ((zxingImage.getWidth() + x) > backgroundImage.getWidth() || (zxingImage.getHeight() + y) > backgroundImage.getHeight()) {
            throw new IOException(">>>>>二维码宽度+x不可以超过背景图的宽度,长度同理");
        }

        //合并图片
        Graphics2D g = backgroundImage.createGraphics();
        g.drawImage(zxingImage, x, y,
                zxingImage.getWidth(), zxingImage.getHeight(), null);
        return backgroundImage;
    }

    /**
     * 将文字绘制在背景图上
     *
     * @param backgroundImage 背景图
     * @param x               文字在背景图上绘制的x轴起点
     * @param y               文字在背景图上绘制的y轴起点
     * @return
     * @throws IOException
     */
    public static BufferedImage drawString(BufferedImage backgroundImage, String text, int x, int y,Font font,Color color) {
        //绘制文字
        Graphics2D g = backgroundImage.createGraphics();
        //设置颜色
        g.setColor(color);
        //消除锯齿状
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
        //设置字体
        g.setFont(font);
        //绘制文字
        g.drawString(text, x, y);
        return backgroundImage;
    }


    public static InputStream bufferedImageToInputStream(BufferedImage backgroundImage) throws IOException {
        return bufferedImageToInputStream(backgroundImage, "png");
    }

    /**
     * backgroundImage 转换为输出流
     *
     * @param backgroundImage
     * @param format
     * @return
     * @throws IOException
     */
    public static InputStream bufferedImageToInputStream(BufferedImage backgroundImage, String format) throws IOException {
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        try (
                ImageOutputStream
                        imOut = ImageIO.createImageOutputStream(bs)) {
            ImageIO.write(backgroundImage, format, imOut);
            InputStream is = new ByteArrayInputStream(bs.toByteArray());
            return is;
        }
    }

    /**
     * 保存为文件
     *
     * @param is
     * @param fileName
     * @throws IOException
     */
    public static void saveFile(InputStream is, String fileName) throws IOException {
        try (BufferedInputStream in = new BufferedInputStream(is);
             BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(fileName))) {
            int len;
            byte[] b = new byte[1024];
            while ((len = in.read(b)) != -1) {
                out.write(b, 0, len);
            }
        }
    }
    //读取远程url图片,得到宽高
    public static int[] returnImgWH(URL url) {
        int[] a = new int[2];
        BufferedImage bi = null;
        boolean imgwrong=false;
        try {
            //读取图片
            bi = javax.imageio.ImageIO.read(url);
            try{
                //判断文件图片是否能正常显示,有些图片编码不正确
                int i = bi.getType();
                imgwrong=true;
            }catch(Exception e){
                imgwrong=false;
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if(imgwrong){
            a[0] = bi.getWidth(); //获得 宽度
            a[1] = bi.getHeight(); //获得 高度
        }else{
            a=null;
        }
        return a;
    }

    public static void main(String[] args) {
        //二维码宽度
        int width = 293;
        //二维码高度
        int height = 293;
        //二维码内容
        String contcent = "http://192.168.4.162:8802/portal/courseActivity/detail?id=aed2fabfde70409ea0611d4eaf05dd6e:3b8b77dd-a63b-4555-abc0-2c0033af35be";
        BufferedImage zxingImage = null;
        try {
            //二维码图片流
            zxingImage = ZxingUtils.enQRCode(contcent, width, height);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        //背景图片地址
        String backgroundPath = "http://test-dfs.enterfaces.com/M00/00/51/CgYBa1zRe4iAM5e9AAEUUh_Ua8g311.jpg";
        InputStream inputStream = null;
        try {
            URL url = new URL(backgroundPath);
            int[] bb = returnImgWH(url);

            //合成二维码和背景图
            BufferedImage image = ZxingUtils.drawImage(backgroundPath, zxingImage, bb[0]-width, bb[1]-height);
//            //-----------------------------------------绘制文字-----------------------------------------------------
//            Font font = new Font("微软雅黑", Font.BOLD, 35);
//            String text = "";
//            image = ZxingUtils.drawString(image, text, 375, 647,font,new Color(244,254,189));
//            //-----------------------------------------绘制文字-----------------------------------------------------
            //图片转inputStream
            inputStream = ZxingUtils.bufferedImageToInputStream(image);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //保存的图片路径
        String originalFileName = "D://99999.png";
        try {
            //保存为本地图片
            ZxingUtils.saveFile(inputStream, originalFileName);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}