java生成二维码
- 首先需要引入依赖
<!--引入生成二维码的依赖-->
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
public class QrCode {
private static final Logger log = LoggerFactory.getLogger(QrCode.class);
private static final String CHARSET = "utf-8";
public static final String FORMAT = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 50;
// LOGO宽度
private static final int LOGO_WIDTH = 30;
// LOGO高度
private static final int LOGO_HEIGHT = 30;
/**
* 生成二维码
*
* @param content 二维码内容
* @param logoPath logo地址
* @param needCompress 是否压缩logo
* @return 图片
* @throws Exception
*/
public static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, 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++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
if (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QrCode.insertImage(image, logoPath, needCompress);
return image;
}
public static BufferedImage createImage1(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 180, 180,
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 (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QrCode.insertImage(image, logoPath, needCompress);
return image;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param logoPath LOGO图片地址
* @param needCompress 是否压缩
* @throws IOException
*/
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws IOException {
InputStream inputStream = null;
try {
inputStream = QrCode.getResourceAsStream(logoPath);
Image src = ImageIO.read(inputStream);
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > LOGO_WIDTH) {
width = LOGO_WIDTH;
}
if (height > LOGO_HEIGHT) {
height = LOGO_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();
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
if (inputStream != null) {
inputStream.close();
}
}
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param logoPath LOGO地址
* @param output 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String logoPath, OutputStream output, boolean needCompress)
throws Exception {
//这个是尺寸小de
BufferedImage image = QrCode.createImage(content, logoPath, needCompress);
FastByteArrayOutputStream fos = new FastByteArrayOutputStream();
ImageIO.write(image, "jpg", fos);
//4.返回 base64
return Base64.encodeBase64String(fos.toByteArray());
//ImageIO.write(image, FORMAT, output);
}
public static String encode(String content, String logoPath, OutputStream output, boolean needCompress,int i)
throws Exception {
//这个是尺寸大de
BufferedImage image = QrCode.createImage1(content, logoPath, needCompress);
FastByteArrayOutputStream fos = new FastByteArrayOutputStream();
ImageIO.write(image, "jpg", fos);
//4.返回 base64
return Base64.encodeBase64String(fos.toByteArray());
//ImageIO.write(image, FORMAT, output);
}
/**
* 获取指定文件的输入流,获取logo
*
* @param logoPath 文件的路径
* @return
*/
public static InputStream getResourceAsStream(String logoPath) {
return QrCode.class.getResourceAsStream(logoPath);
}
}
标签:String,int,image,width,二维码,logoPath,LOGO
From: https://www.cnblogs.com/srjx/p/16714770.html