添加Maven依赖
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.1</version>
</dependency>
程序代码
/**
* 二维码工具类
* @Author kzh
* @Description
* @Date 19-4-1 下午4:50
*/
public class QrCodeUtils {
private static final Logger log = LoggerFactory.getLogger(QrCodeUtils.class);
/**
* 创建二维码
* @param content 二维码封装内容
* @param logo 中心logo（未支持）
* @param weight 宽度
* @param height 高度
* @return
*/
public static BufferedImage createImage(String content, String logo, Integer weight, Integer height) {
/**
* 1、如果高度和宽度都有指定，使用指定的高宽
* 2、如果高宽都未指定，使用默认的高宽300x300
* 3、只指定了高宽中的一个，则高宽相等
*/
if(weight != null && height != null) {
}else if(weight == null && height == null) {
weight = 300;
height = 300;
}else {
weight = (weight == null ? height : weight);
height = (height == null ? weight : height);
}
// 相关设置
HashMap<EncodeHintType, Comparable> hints = new HashMap<>();
// L(7%) M(15%) Q(25%) H(30%)
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
// 二维码边界空白大小1,2,3,4，默认4，最大
hints.put(EncodeHintType.MARGIN, 1);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
try {
QRCodeWriter writer = new QRCodeWriter();
BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, weight, height, hints);
BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);
return image;
} catch (WriterException e) {
log.error("生成二维码失败, 错误信息:{}", JSON.toJSONString(e));
throw new RuntimeException("生成二维码失败");
}
}
/**
* 输出二维码到流中
* 在本项目中输出到流中会出现换行，导致输出乱码，原因不详，建议使用base64输出形式{@link QrCodeUtils#writeToBase64(java.lang.String, java.lang.String, java.lang.Integer, java.lang.Integer)}
* @param content
* @param logo
* @param stream
* @param weight
* @param height
*/
public static void writeToStream(String content, String logo, OutputStream stream, Integer weight, Integer height) {
try {
BufferedImage image = createImage(content, logo, weight, height);
// 输出图片为png格式
ImageIO.write(image, "png", stream);
} catch (IOException e) {
log.error("生成二维码失败, 写入二维码到流失败，错误信息:{}", JSON.toJSONString(e));
throw new RuntimeException( "生成二维码失败");
}
}
/**
* 以base64形式输出二维码
* @param content
* @param logo
* @param weight
* @param height
* @return
*/
public static String writeToBase64(String content, String logo, Integer weight, Integer height){
try {
BufferedImage image = createImage(content, logo, weight, height);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
// 输出图片为png格式
ImageIO.write(image, "png", bos);
return "data:image/png;base64," + Base64.encode(bos.toByteArray());
} catch (IOException e) {
log.error("生成二维码失败, 二维码转base64失败，错误信息:{}", JSON.toJSONString(e));
throw new RuntimeException("生成二维码失败");
}
}
}