说明
- ZXing，一个支持在图像中解码和生成条形码(如二维码、PDF 417、EAN、UPC、Aztec、Data Matrix、Codabar)的库。ZXing(“zebra crossing”)是一个开源的、多格式的、用Java实现的一维/二维条码图像处理库，具有到其他语言的端口。
- GitHub地址，猛戳：https://github.com/zxing/zxing
- API文档，猛戳：https://zxing.github.io/zxing/apidocs/index.html
- 介绍文档，猛戳：https://zxing.github.io/zxing/
- 完整代码地址在结尾！！
第一步，在pom.xml加入依赖，如下
<!-- 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>
第二步，编写application.yml配置文件，如下
server:
port: 8187
spring:
application:
name: zxing-demo-server
# qr配置
qr:
code:
charset: utf-8
width: 300
height: 300
logoWidth: 60
logoHeight: 60
picType: jpg
第三步，创建QrCodeConfig配置文件，如下
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import javax.annotation.PostConstruct;
import java.io.Serializable;
/**
* QrCodeConfig
*
* @author luoyu
* @date 2018/10/19 18:47
* @description 二维码配置类
*/
@Data
@Configuration
public class QrCodeConfig implements Serializable {
private static final long serialVersionUID = 1L;
@Value("${qr.code.charset}")
private String configCharset;
@Value("${qr.code.width}")
private Integer configWidth;
@Value("${qr.code.height}")
private Integer configHeight;
@Value("${qr.code.logoWidth}")
private Integer configLogoWidth;
@Value("${qr.code.logoHeight}")
private Integer configLogoHeight;
@Value("${qr.code.picType}")
private String configPicType;
/**
* 编码
*/
public static String charset;
/**
* 生成二维码的宽
*/
public static Integer width;
/**
* 生成二维码的高
*/
public static Integer height;
/**
* logo的宽
*/
public static Integer logoWidth;
/**
* logo的高
*/
public static Integer logoHeight;
/**
* 生成二维码图片的格式 png, jpg
*/
public static String picType;
@PostConstruct
public void setCharset() {
charset = this.configCharset;
}
@PostConstruct
public void setWidth() {
width = this.configWidth;
}
@PostConstruct
public void setHeight() {
height = this.configHeight;
}
@PostConstruct
public void setLogoWidth() {
logoWidth = this.configLogoWidth;
}
@PostConstruct
public void setLogoHeight() {
logoHeight = this.configLogoHeight;
}
@PostConstruct
public void setPicType() {
picType = this.configPicType;
}
}
第四步，创建QRCodeUtils工具类，如下
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.luoyu.zxing.config.QrCodeConfig;
import lombok.extern.slf4j.Slf4j;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Hashtable;
@Slf4j
public class QRCodeUtils {
/**
* 生成二维码图片
*
* @param content 二维码内容
* @param imgPath 中间log地址
* @param needCompress 是否压缩
* @return
* @throws Exception
*/
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
try {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, QrCodeConfig.charset);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QrCodeConfig.width,
QrCodeConfig.height, 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++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtils.insertImage(image, imgPath, needCompress);
return image;
}catch (Exception e){
log.error("生成二维码失败：" + e);
return null;
}
}
/**
* 插入LOGO
*
* @param imgPath 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()) {
log.error(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 > QrCodeConfig.logoWidth) {
width = QrCodeConfig.logoWidth;
}
if (height > QrCodeConfig.logoHeight) {
height = QrCodeConfig.logoHeight;
}
Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
// 绘制缩小后的图
g.drawImage(image, 0, 0, null);
g.dispose();
src = image;
}
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (QrCodeConfig.width - width) / 2;
int y = (QrCodeConfig.height - 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();
}
/**
* 创建文件夹， 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
*/
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();
}
}
/**
* 生成带logo二维码
*
* @param content 二维码的内容
* @param imgPath 中间log地址
* @param output
* @param needCompress 是否压缩
* @throws Exception
*/
public static void encode(String content, String imgPath, ServletOutputStream output, boolean needCompress) {
try {
BufferedImage image = QRCodeUtils.createImage(content, imgPath, needCompress);
ImageIO.write(image, QrCodeConfig.picType, output);
} catch (Exception e) {
log.error("生成二维码失败：" + e);
}
}
/**
* 生成不带logo二维码
*
* @param content 二维码的内容
* @param output
* @throws Exception
*/
public static void encode(String content, ServletOutputStream output) {
QRCodeUtils.encode(content, null, output, false);
}
}
第五步，创建QRCodeController类，如下
import com.luoyu.zxing.util.QRCodeUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
/**
* <p>
* 二维码
* </p>
*
* @author luoyu
* @since 2018-11-30
*/
@RestController
public class QRCodeController {
/**
* 生成普通二维码
*/
@GetMapping(value = "/qrcode/common")
public void getCommonQRCode(HttpServletResponse response, String url) throws Exception {
ServletOutputStream stream = null;
try {
stream = response.getOutputStream();
//使用工具类生成二维码
QRCodeUtils.encode(url, stream);
} finally {
if (stream != null) {
stream.flush();
stream.close();
}
}
}
/**
* 生成带有logo二维码
*/
@GetMapping(value = "/qrcode/logo")
public void getLogoQRCode(HttpServletResponse response, String url) throws Exception {
ServletOutputStream stream = null;
try {
stream = response.getOutputStream();
// logo 地址
String logoPath = Thread.currentThread().getContextClassLoader().getResource("").getPath()
+ "templates" + File.separator + "advator.jpg";
// String logoPath = "springboot-demo-list/qr-code/src/main/resources/templates/advator.jpg";
//使用工具类生成二维码
QRCodeUtils.encode(url, logoPath, stream, true);
} finally {
if (stream != null) {
stream.flush();
stream.close();
}
}
}
}
第六步，启动项目，使用postman调接口，如下图
image.png
