首先引入Jar包：

<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>3.2.1</version>

</dependency>

然后开始撸代码

package com.zxtg.zshop.common;

import java.awt.BasicStroke;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.Hashtable;

import javax.imageio.ImageIO;

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.MatrixToImageConfig;

import com.google.zxing.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

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

public class MatrixToImageWriterEx {

private static final MatrixToLogoImageConfig DEFAULT_CONFIG = new MatrixToLogoImageConfig();

/**

* 根据内容生成二维码数据

* @param content 二维码文字内容[为了信息安全性，一般都要先进行数据加密]

* @param width 二维码照片宽度

* @param height 二维码照片高度

* @return

*/

public static BitMatrix createQRCode(String content, int width, int height){

Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();   

//设置字符编码

        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  

        // 指定纠错等级

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

        BitMatrix matrix = null;  

        try {  

            matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints); 

        } catch (WriterException e) {  

            e.printStackTrace();  

        }

        return matrix;

}

/**

* 写入二维码、以及将照片logo写入二维码中

* @param matrix 要写入的二维码

* @param format 二维码照片格式

* @param imagePath 二维码照片保存路径

* @param logoPath logo路径

* @throws IOException

*/

public static void writeToFile(BitMatrix matrix, String format, String imagePath, String logoPath) throws IOException {

MatrixToImageWriter.writeToFile(matrix, format, new File(imagePath), new MatrixToImageConfig());

//添加logo图片, 此处一定需要重新进行读取，而不能直接使用二维码的BufferedImage 对象

BufferedImage img = ImageIO.read(new File(imagePath));

MatrixToImageWriterEx.overlapImage(img, format, imagePath, logoPath, DEFAULT_CONFIG);

}

/**

* 写入二维码、以及将照片logo写入二维码中

* @param matrix 要写入的二维码

* @param format 二维码照片格式

* @param imagePath 二维码照片保存路径

* @param logoPath logo路径

* @param logoConfig logo配置对象

* @throws IOException

*/

public static void writeToFile(BitMatrix matrix, String format, String imagePath, String logoPath, MatrixToLogoImageConfig logoConfig) throws IOException {

MatrixToImageWriter.writeToFile(matrix, format, new File(imagePath), new MatrixToImageConfig());

//添加logo图片, 此处一定需要重新进行读取，而不能直接使用二维码的BufferedImage 对象

BufferedImage img = ImageIO.read(new File(imagePath));

MatrixToImageWriterEx.overlapImage(img, format, imagePath, logoPath, logoConfig);

}

/**

* 将照片logo添加到二维码中间

* @param image 生成的二维码照片对象

* @param imagePath 照片保存路径

* @param logoPath logo照片路径

* @param formate 照片格式

*/

public static void overlapImage(BufferedImage image, String formate, String imagePath, String logoPath, MatrixToLogoImageConfig logoConfig) {

try {

BufferedImage logo = ImageIO.read(new File(logoPath));

Graphics2D g = image.createGraphics();

//考虑到logo照片贴到二维码中，建议大小不要超过二维码的1/5;

int width = image.getWidth() / logoConfig.getLogoPart();

int height = image.getHeight() / logoConfig.getLogoPart();

//logo起始位置，此目的是为logo居中显示

int x = (image.getWidth() - width) / 2;

int y = (image.getHeight() - height) / 2;

//绘制图

g.drawImage(logo, x, y, width, height, null);

//给logo画边框

//构造一个具有指定线条宽度以及 cap 和 join 风格的默认值的实心 BasicStroke

g.setStroke(new BasicStroke(logoConfig.getBorder()));

g.setColor(logoConfig.getBorderColor());

g.drawRect(x, y, width, height);

g.dispose();

//写入logo照片到二维码

ImageIO.write(image, formate, new File(imagePath));

} catch (Exception e) {

e.printStackTrace();

}

}

}

最后我们调用QrcodeGenerator.encode方法一下：

package com.zxtg.zshop.util;

import java.awt.Color;

import java.awt.image.BufferedImage;

import com.google.zxing.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

import com.zxtg.zshop.common.MatrixToImageWriterEx;

public class QrcodeGenerator {

public static BufferedImage encode(String content, int width, int height) {

try {

BitMatrix matrix = MatrixToImageWriterEx.createQRCode(content, width, height);

BufferedImage image = MatrixToImageWriter.toBufferedImage(matrix);

return image;

} catch (Exception e) {

e.printStackTrace();

}

return null;

} 

}

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