一.添加依赖
<!-- 二维码支持包 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.0</version>
</dependency>二.QRCode工具类
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;
/**
* @author qinxun
* @date 2023-06-02
* @Descripion: QRCode二维码工具类
*/
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
/**
* @param content 二维码内容
* @param imgPath logo图片地址
* @param needCompress 是否需要压缩
* @return
* @throws Exception
*/
private static BufferedImage createImage(String content, String imgPath,
boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET); // 文本编码格式
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints); // 设置生成二维码的大小
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB); // 设置二维码中logo的大小
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 (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()) {
System.err.println("" + 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);
if (needCompress) { // 压缩LOGO
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);
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)
*
* @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, Integer naireID) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,
needCompress);
mkdirs(destPath);
String file = naireID + ".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 存放目录
*/
public static void mkdirs(String destPath) {
File file = new File(destPath);
//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)
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 生成二维码(内嵌LOGO)
*
* @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, Integer naireID)
throws Exception {
QRCodeUtil.encode(content, imgPath, destPath, false, naireID);
}
/**
* 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 void encode(String content, String destPath,
boolean needCompress, Integer naireID) throws Exception {
QRCodeUtil.encode(content, null, destPath, needCompress, naireID);
}
/**
* 生成二维码
*
* @param content 内容
* @param destPath 存储地址
* @param naireid 自定义问卷二维码编号
* @throws Exception
*/
public static void encode(String content, String destPath, Integer naireid) throws Exception {
QRCodeUtil.encode(content, null, destPath, false, naireid);
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param imgPath LOGO地址
* @param output 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String imgPath,
OutputStream output, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,
needCompress);
ImageIO.write(image, FORMAT_NAME, 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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
/**
* 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));
}
}三.创建控制层测试
import com.example.quartzdemo.util.QRCodeUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author qinxun
* @date 2023-06-02
* @Descripion: 测试
*/
@RestController
public class TestController {
/**
* 生成二维码
* @throws Exception
*/
@RequestMapping("/createQrcode")
public String createQrcode() throws Exception {
//二维码内容
String content = "https://blog.51cto.com/";
//logo地址 尺寸规定要比生成二维码尺寸小
String logoPath = "E:\\img\\logo.jpg";
//保存目录
String savePath = "E:\\img";
//生成二维码
QRCodeUtil.encode(content,logoPath,savePath,false,1);
return "二维码生成成功";
}
/**
* 解析二维码获取内容
*/
@RequestMapping("/deocdeQrcode")
public String deocdeQrcode() throws Exception {
//二维码图片
String codePath = "E:\\img\\1.jpg";
return QRCodeUtil.decode(codePath);
}
}
请求createQrcode接口生成二维码图片
电脑到磁盘上的图片
请求deocdeQrcode获取二维码图片的内容
