新建一个工具类：QRCodeUtil
引入两个主要的依赖：
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.1</version>
</dependency>
基本的一些属性：
private static final Logger logger = Logger.getLogger(QRCodeUtil.class.getName());
private static final String CHARSET = "UTF-8";
private static final String FORMAT_NAME = "JPG";
private static final int QRCODE_SIZE = 300;
private static final int WIDTH = 60;
private static final int HEIGHT = 60;
创建createImage类
package com.example.demotest;
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;
import java.util.Random;
import java.util.logging.Logger;
/**
* @Author 刘德意 -HP
* @Date 2021/9/17 9:35
* @Description: 二维码的工具类
*/
public class QRCodeUtil {
private static final Logger logger = Logger.getLogger(QRCodeUtil.class.getName());
private static final String CHARSET = "UTF-8";
private static final String FORMAT_NAME = "JPG";
private static final int QRCODE_SIZE = 300;
private static final int WIDTH = 60;
private static final int HEIGHT = 60;
//QRCodeWriter;
//QRCodeReader
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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();
//Image是一个抽象列，BufferedImage是Image的实现。Image和BufferedImage的主要作用就是将一副图片加载到内存中。
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
image.setRGB(i, j, bitMatrix.get(i, j) ? 0xff000000:0xffffffff);
}
}
if (imgPath == null || "".equals(imgPath)){
return image;
}
//插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}
/**
* 插入LOGO
* @param source 二维码图片
* @param imgPath LOGO图片地址
* @param needCompress 是否压缩
* @throws Exception
*/
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
File file = new File(imgPath);
if (!file.exists()){
logger.warning(imgPath +":该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
//压缩logo
if (needCompress){
if (width > WIDTH){
width = WIDTH;
}
if (height > HEIGHT){
height = HEIGHT;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//绘制缩小后的图
Graphics graphics = tag.getGraphics();
graphics.drawImage(image, 0, 0, null);
graphics.dispose();
}
//插入LOGO
Graphics2D graphics2D = source.createGraphics();
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graphics2D.drawImage(src, x, y, width, height, null);
Shape shape = new RoundRectangle2D.Float(x, y, width, height, 6, 6);
graphics2D.setStroke(new BasicStroke(3f));
graphics2D.draw(shape);
graphics2D.dispose();
}
/**
* 生成二维码，内嵌LGOG
* @param content 内容
* @param imgPath LOGO地址
* @param destPath 存放目录
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
String file = new Random().nextInt(9999) + ".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
}
/**
* 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 存放的目录
*/
public static void mkdirs(String destPath) {
File file = new File(destPath);
if (!file.exists()){
file.mkdirs();
}
}
/**
*
* @param content 内容
* @param imgPath LOGO地址
* @param destPath 存储地址
* @throws Exception
*/
public static void encode(String content, String imgPath, String destPath) throws Exception {
QRCodeUtil.encode(content, imgPath, destPath, false);
}
/**
* 生产二维码
* @param content 内容
* @param destPath 存储地址
* @throws Exception
*/
public static void encode(String content, String destPath) throws Exception {
QRCodeUtil.encode(content,null, destPath, false);
}
/**
* 生成二维码，内嵌LOGO
* @param content 内容
* @param imgPahth LOGO地址
* @param outputStream 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String imgPahth, OutputStream outputStream, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPahth, needCompress);
ImageIO.write(image, FORMAT_NAME, outputStream);
}
/**
* 生成二维码
* @param content 内容
* @param outputStream 输出流
* @throws Exception
*/
public static void encode(String content, OutputStream outputStream) throws Exception {
QRCodeUtil.encode(content, null, outputStream, false);
}
/**
* 解析二维码
* @param file 二维码文件
* @return
* @throws Exception
*/
public static String decode(File file) throws Exception {
BufferedImage image;
image = ImageIO.read(file);
if (null == image){
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, 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));
}
/**
*
* @param text
* @param picturePath
* @param location
* @throws Exception
*/
public static void createCode(String text, String picturePath, String location) throws Exception {
QRCodeUtil.encode(text, picturePath, location, true);
}
}
