本文介绍了一个用于生成带Logo的二维码的Java类库，包括二维码的创建、插入Logo、以及通过不同方式输出二维码图像的方法。同时，提供了在Web应用中动态生成二维码流和导出二维码的控制器实现。
1。
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 100;
// LOGO高度
private static final int HEIGHT = 100;
/**
* 生成二维码的方法
*
* @param content 目标URL
* @param imgPath LOGO图片地址
* @param needCompress 是否压缩LOGO
* @return 二维码图片
* @throws Exception
*/
public static BufferedImage createImage(String content, String imgPath,
boolean needCompress) throws Exception {
Hashtable 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 (imgPath == null || "".equals(imgPath)) {
return image;
}
// 插入图片
QRCodeUtil.insertImage(image, imgPath, needCompress);
return image;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param imgPath LOGO图片地址
* @param needCompress 是否压缩
* @throws Exception
*/
public static void insertImage(BufferedImage source, String imgPath,
boolean needCompress) throws Exception {
// File file = new File(imgPath);
// if (!file.exists()) {
// System.err.println("" + imgPath + " 该文件不存在！");
// return;
// }
Image src = ImageIO.read(new URL(imgPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = 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();
}
}
2。
public final class MatrixToImageWriter {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
private MatrixToImageWriter() {
}
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
}
}
return image;
}
public static void writeToFile(BitMatrix matrix, String format, File file)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format " + format + " to " + file);
}
}
public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, stream)) {
throw new IOException("Could not write an image of format " + format);
}
}
}
3。
@Controller
public class QRcodeController {
private static final Logger LOGGER = LoggerFactory.getLogger(QRcodeController.class);
//logo图片路径
@Value("${logo.img.url}")
private String IMG_PATH ;
/**
* 动态生成二维码流
*
* @param request
* @param response
* @param id 物品id
* @return
* @throws Exception
*/
@RequestMapping(value = "/qrcode", method = RequestMethod.GET)
public Object qrcode(HttpServletRequest request, HttpServletResponse response, String id) throws Exception {
JSONObject object = new JSONObject();
if (id == null) {
id = "";
}
StringBuffer stringBuffer = new StringBuffer(id);
// 禁止图像缓存。
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/png");
ServletOutputStream sos = null;
try {
// 将图像输出到 Servlet输出流中。
sos = response.getOutputStream();
BufferedImage image = QRCodeUtil.createImage(val, IMG_PATH, true);
ImageIO.write(image, "PNG", sos);
} catch (Exception e) {
LOGGER.error("生成二维码时发生异常", e);
} finally {
if (null != sos) {
try {
sos.close();
} catch (IOException e) {
LOGGER.error("生成二维码关闭输出流发生异常", e);
}
}
}
return null;
}
/**
* 二维码导出
* 字节流图片下载
* @param id 床位或房间id
* @param fileName 二维码的名称
* @param type bed生成床位二维码 room 生成房间二维码
*/
// @RequestMapping(value = "/exportQRcode", method = RequestMethod.GET)
// public void exportQRcode(HttpServletResponse response, String id, String fileName, String type) {
// JSONObject object = new JSONObject();
// if (StringUtils.isEmpty(id)) {
// id = "";
// }
// if (Objects.equals("bed", type)) {
// //查询床位的信息
// DataMap dataMap = manageBedsService.selectBedByIdForQRcode(id);
// if (!CollectionUtils.isEmpty(dataMap)){
// object.put("areaName",dataMap.getString("areaName"));
// object.put("buildingName",dataMap.getString("buildingName"));
// object.put("roomName",dataMap.getString("roomName"));
// object.put("bedName",dataMap.getString("bedName"));
// object.put("id",dataMap.getString("id"));
// fileName = dataMap.getString("areaName")+"-"
// +dataMap.getString("buildingName")+"-"
// +dataMap.getString("roomName")+"-"
// +dataMap.getString("bedName")+".png";
// }
// } else {
// //查询房间的信息
// DataMap dataMap = manageRoomService.selectRoomByIdForQRcode(id);
// if (!CollectionUtils.isEmpty(dataMap)){
// object.put("areaName",dataMap.getString("areaName"));
// object.put("buildingName",dataMap.getString("buildingName"));
// object.put("roomName",dataMap.getString("roomName"));
// object.put("id",dataMap.getString("id"));
// fileName = dataMap.getString("areaName")+"-"
// +dataMap.getString("buildingName")+"-"
// +dataMap.getString("roomName")+".png";
// }
// }
// try {
// int width = 300; // 图像宽度
// int height = 300; // 图像高度
// Map<EncodeHintType, Object> hints = new HashMap<>();
// hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// BitMatrix bitMatrix = new MultiFormatWriter().encode(object.toJSONString(), BarcodeFormat.QR_CODE, width, height, hints);// 生成矩阵
// BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
// //bufferedImage转inputStream
// ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
// ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream);
// ImageIO.write(bufferedImage, "png", imageOutput);
// InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
//
// response.reset(); // 非常重要
// byte[] buf = new byte[1024];
// int len = 0;
// response.setCharacterEncoding("UTF-8");
// response.setContentType("application/x-msdownload");
// response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "utf-8"));
// OutputStream out = response.getOutputStream();
// while ((len = inputStream.read(buf)) > 0) {
// out.write(buf, 0, len);
// }
// inputStream.close();
// out.close();
// } catch (WriterException e) {
// e.printStackTrace();
// } catch (IOException e) {
// e.printStackTrace();
// }
// }
/**
* 房间--床位的批量导出二维码
*@param search 查询
*@param level 树节点等级
*@param nodeid 树id
*@param type room /bed
* @return
* @throws Exception
*/
// @RequestMapping(value = "/batchGenerateQRcode", method = RequestMethod.GET)
// public void batchGenerateQRcode(String search, String level, String nodeid, String type, HttpServletRequest request, HttpServletResponse response) {
// InputStream inStream=null;
// try {
// List<DataMap> dataMapList=null;
// String schoolCode = userSessionUtil.getCurrentUserSchoolCode(request);
// if (Objects.equals("room",type)){
// //获取房间列表
// dataMapList = manageRoomService.batchGenerateRoomQRcode(search, level, nodeid, schoolCode);
// }else if (Objects.equals("bed",type)){
// //获取床位信息
// dataMapList = manageBedsService.batchGenerateBedQRcode(search,level,nodeid,schoolCode);
// }
// if (!CollectionUtils.isEmpty(dataMapList)) {
// //在根路径下创建一个文件夹
// String rootPath = request.getSession().getServletContext().getRealPath(File.separator );
// Date date = new Date();
// long time = date.getTime();
// File file = new File(rootPath +File.separator + time +File.separator );
// boolean newFile = file.mkdir();
// if (!newFile) {
// LOGGER.error("文件夹创建失败");
// }
// //循环写入二维码
// for (DataMap room : dataMapList) {
// String pathName="";//图片的路径
// JSONObject jsonObject = new JSONObject();
// if (Objects.equals("room",type)) { //批量导出房间
// jsonObject.put("areaName", room.getString("areaName"));
// jsonObject.put("buildingName", room.getString("buildingName"));
// jsonObject.put("roomName", room.getString("roomName"));
// jsonObject.put("id", room.getString("id"));
// pathName = rootPath + File.separator + time + File.separator
// +room.getString("areaName")+ "-"
// + room.getString("buildingName") + "-"
// + room.getString("roomName") + ".png";
// }else if(Objects.equals("bed",type)){
// jsonObject.put("areaName", room.getString("areaName"));
// jsonObject.put("buildingName", room.getString("buildingName"));
// jsonObject.put("roomName", room.getString("roomName"));
// jsonObject.put("bedName",room.getString("bedName"));
// jsonObject.put("id", room.getString("id"));
// pathName = rootPath + File.separator + time + File.separator
// +room.getString("areaName")+ "-"
// + room.getString("buildingName") + "-"
// + room.getString("roomName")+"-"
// + room.getString("bedName")
// + ".png";
// }
// String text = jsonObject.toJSONString();
// //生成二维码图片，并返回图片路径
// QRcodeUtils.generateQRCode(text, pathName);
// }
// //压缩文件夹
// String sourceFilePath = rootPath + File.separator + time;
// String zipFilePath = rootPath + File.separator ;
// String fileName = time + "";
// boolean flag = FileToZip.fileToZip(sourceFilePath, zipFilePath, fileName);
// if (!flag) {
// LOGGER.error("文件打包失败");
// }
// File fileZip = null;
//
// //将文件夹弹出给页面response
// fileZip = new File(rootPath + File.separator + time + ".zip");
// inStream = new FileInputStream(fileZip);
// response.reset(); // 非常重要
// byte[] buf = new byte[1024];
// int len = 0;
// response.setCharacterEncoding("UTF-8");
// response.setContentType("application/x-msdownload");
// response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".zip");
// OutputStream out = response.getOutputStream();
// while ((len = inStream.read(buf)) > 0)
// out.write(buf, 0, len);
// inStream.close();
// out.close();
//
// //删除文件夹里所有二维码
// File[] files = file.listFiles();
// for (File fOrd : files) {
// fOrd.delete();
// }
// //删除文件夹
// file.delete();
// //删除压缩文件
// fileZip.delete();
// } else {
// LOGGER.error("请选择要导出二维码的房间");
// }
// } catch (Exception e) {
// e.printStackTrace();
// }finally {
// try {
// //关闭流
// if(null !=inStream)inStream.close();
// } catch (IOException e) {
// e.printStackTrace();
// }
//
// }
//
// }
}
4。
<!-- 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>
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