如何使用谷歌Jar包生成二维码呢?
下文笔者将借助谷歌的jar包生成一个二维码，如下所示
借助谷歌的com.google.zxing包 即可生成二维码图片 然后我们可以返回相应流 使用以上方法即可实现生成二维码的效果例:二维码工具类的编写
//引入jar包
<!-- 二维码生成 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.3</version>
</dependency>
import cn.hutool.core.codec.Base64;
import cn.hutool.core.util.StrUtil;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.java265.Common.Exception.CustomerException;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashMap;
/**
* <p>QRCodeUtil</p>
*
*
* @version 1.0.0
* @date 2020/7/8
*/
public class QRCodeUtil {
/**
* 默认宽度
*/
private static final Integer WIDTH = 140;
/**
* 默认高度
*/
private static final Integer HEIGHT = 140;
/**
* LOGO 默认宽度
*/
private static final Integer LOGO_WIDTH = 22;
/**
* LOGO 默认高度
*/
private static final Integer LOGO_HEIGHT = 22;
/**
* 图片格式
*/
private static final String IMAGE_FORMAT = "png";
private static final String CHARSET = "utf-8";
/**
* 原生转码前面没有 data:image/png;base64 这些字段，返回给前端是无法被解析
*/
private static final String BASE64_IMAGE = "data:image/png;base64,%s";
/**
* 生成二维码，使用默认尺寸
*
* @param content 内容
* @return
*/
public static String getBase64QRCode(String content) {
return getBase64Image(content, WIDTH, HEIGHT, null, null, null);
}
/**
* 生成二维码，使用默认尺寸二维码，插入默认尺寸logo
*
* @param content 内容
* @param logoUrl logo地址
* @return
*/
public static String getBase64QRCode(String content, String logoUrl) {
return getBase64Image(content, WIDTH, HEIGHT, logoUrl, LOGO_WIDTH, LOGO_HEIGHT);
}
/**
* 生成二维码
*
* @param content 内容
* @param width 二维码宽度
* @param height 二维码高度
* @param logoUrl logo 在线地址
* @param logoWidth logo 宽度
* @param logoHeight logo 高度
* @return
*/
public static String getBase64QRCode(String content, Integer width, Integer height, String logoUrl, Integer logoWidth, Integer logoHeight) {
return getBase64Image(content, width, height, logoUrl, logoWidth, logoHeight);
}
private static String getBase64Image(String content, Integer width, Integer height, String logoUrl, Integer logoWidth, Integer logoHeight) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
BufferedImage bufferedImage = crateQRCode(content, width, height, logoUrl, logoWidth, logoHeight);
try {
ImageIO.write(bufferedImage, IMAGE_FORMAT, os);
} catch (IOException e) {
throw new CustomerException("[生成二维码，错误{}]", e);
}
// 转出即可直接使用
return String.format(BASE64_IMAGE, Base64.encode(os.toByteArray()));
}
/**
* 生成二维码
*
* @param content 内容
* @param width 二维码宽度
* @param height 二维码高度
* @param logoUrl logo 在线地址
* @param logoWidth logo 宽度
* @param logoHeight logo 高度
* @return
*/
private static BufferedImage crateQRCode(String content, Integer width, Integer height, String logoUrl, Integer logoWidth, Integer logoHeight) {
if (StrUtil.isNotBlank(content)) {
ServletOutputStream stream = null;
HashMap<EncodeHintType, Comparable> hints = new HashMap<>(4);
// 指定字符编码为utf-8
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
// 指定二维码的纠错等级为中级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
// 设置图片的边距
hints.put(EncodeHintType.MARGIN, 2);
try {
QRCodeWriter writer = new QRCodeWriter();
BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (StrUtil.isNotBlank(logoUrl)) {
insertLogo(bufferedImage, width, height, logoUrl, logoWidth, logoHeight);
}
return bufferedImage;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.flush();
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
return null;
}
/**
* 二维码插入logo
*
* @param source 二维码
* @param width 二维码宽度
* @param height 二维码高度
* @param logoUrl logo 在线地址
* @param logoWidth logo 宽度
* @param logoHeight logo 高度
* @throws Exception
*/
private static void insertLogo(BufferedImage source, Integer width, Integer height, String logoUrl, Integer logoWidth, Integer logoHeight) throws Exception {
// logo 源可为 File/InputStream/URL
Image src = ImageIO.read(new URL(logoUrl));
// 插入LOGO
Graphics2D graph = source.createGraphics();
int x = (width - logoWidth) / 2;
int y = (height - logoHeight) / 2;
graph.drawImage(src, x, y, logoWidth, logoHeight, null);
Shape shape = new RoundRectangle2D.Float(x, y, logoWidth, logoHeight, 6, 6);
graph.setStroke(new BasicStroke(3f));
graph.draw(shape);
graph.dispose();
}
/**
* 获取二维码
*
* @param content 内容
* @param output 输出流
* @throws IOException
*/
public static void getQRCode(String content, OutputStream output) throws IOException {
BufferedImage image = crateQRCode(content, WIDTH, HEIGHT, null, null, null);
ImageIO.write(image, IMAGE_FORMAT, output);
}
/**
* 获取二维码
*
* @param content 内容
* @param logoUrl logo资源
* @param output 输出流
* @throws Exception
*/
public static void getQRCode(String content, String logoUrl, OutputStream output) throws Exception {
BufferedImage image = crateQRCode(content, WIDTH, HEIGHT, logoUrl, LOGO_WIDTH, LOGO_HEIGHT);
ImageIO.write(image, IMAGE_FORMAT, output);
}
public static void main(String[] args) {
System.out.println(getBase64QRCode("java265.com"));
}
}
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