1、POM
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.5.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.5.0</version>
</dependency>
2、二维码生成工具类
工具类：
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
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.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
//二维码生成工具类
public class QrCodeUtils {
/**
* 二维码尺寸
*/
private static final int QRCODE_SIZE = 300;
/**
* LOGO宽度
*/
private static final int LOGO_WIDTH = 80;
/**
* LOGO高度
*/
private static final int LOGO_HEIGHT = 80;
/**
* 生成二维码
*
* @param url 二维码解析后的URL地址
* @param logoPath logo地址 如果为空则表示不带logo
* @return 图片
* @throws Exception
*/
public static BufferedImage getQrLogoCode(String url, String logoPath) throws Exception {
Map<EncodeHintType, Object> hints = new HashMap<>(8);
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
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++) {
// 设置黑白相见的颜色
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QrCodeUtils.setLogoImage(image, logoPath);
return image;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param logoPath LOGO图片地址
*/
private static void setLogoImage(BufferedImage source, String logoPath) throws Exception {
URL url = new URL(logoPath);
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
// Image imageIo = ImageIO.read(new File(logoPath));
Image imageIo = ImageIO.read(is);
int width = imageIo.getWidth(null);
int height = imageIo.getHeight(null);
// 设置图片尺寸，如果超过指定大小，则进行响应的缩小
if (width > LOGO_WIDTH || height > LOGO_HEIGHT) {
width = LOGO_WIDTH;
height = LOGO_HEIGHT;
}
Image image = imageIo.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
// 重新绘制Image对象
g.drawImage(image, 0, 0, null);
g.dispose();
imageIo = image;
// 插入LOGO
Graphics2D graph = source.createGraphics();
// 设置为居中
int x = (QRCODE_SIZE - width) / 2;
int y = (QRCODE_SIZE - height) / 2;
graph.drawImage(imageIo, 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();
}
/**
* 解析二维码
*
* @param inputStream 二维码图片流
* @return
* @throws Exception
*/
public static String decodeQrImage(InputStream inputStream) throws Exception {
BufferedImage image = ImageIO.read(inputStream);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Map<DecodeHintType, Object> hints = new HashMap<>(2);
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
Result result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
}
实现类：
import com.utils.QrCodeUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.OutputStream;
@RestController
@RequestMapping("/qrcode")
@Slf4j
public class QrCodeController {
/**
* 生成二维码
*
* @param response
*/
@GetMapping(value = "/qrcode")
public void getQrCodeImage(HttpServletResponse response) {
try (OutputStream os = response.getOutputStream()) {
String url = "http://timoa.cn";
// 生成二维码对象
BufferedImage image = QrCodeUtils.getQrLogoCode(url, null);
//设置response
response.setContentType("image/png");
// 输出jpg格式图片
ImageIO.write(image, "jpg", os);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("二维码生成失败!");
}
}
/**
* 生成带logo的二维码
*
* @param response
*/
@GetMapping(value = "/qrcode/logo")
public void getQrLogoCodeImage(HttpServletResponse response) {
try (OutputStream os = response.getOutputStream()) {
String url = "http://timoa.cn";
String logoPath = "http://timoa.cn/dist/images/logo/logo.png";
// 生成二维码对象
BufferedImage image = QrCodeUtils.getQrLogoCode(url, logoPath);
//设置response
response.setContentType("image/png");
// 输出jpg格式图片
ImageIO.write(image, "jpg", os);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("二维码生成失败!");
}
}
/**
* 解析二维码图片，返回字符串
*
* @param file
*/
@PostMapping(value = "/decode")
public String decodeQrImage(@RequestParam("file") MultipartFile file) {
try {
InputStream inputStream = file.getInputStream();
return QrCodeUtils.decodeQrImage(inputStream);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("二维码解析失败!");
}
}
}
生成二维码如下（无logo及有logo）：
--end--