二维码生成
controller
1 public void getTrainSignQRCode(QRCodeDto qrCodeDto, HttpServletRequest request, HttpServletResponse response) throws Exception { 2 //拼接参数 3 HashMap<String, Object> map = new HashMap<>(); 4 map.put("id",qrCodeDto.getId()); 5 map.put("source",qrCodeDto.getSource()); 6 String content = JSON.toJSONString(map); 7 commonService.getTrainSignQRCode(content, request, response); 8 9 }
impl
1 public void getTrainSignQRCode(String content, HttpServletRequest request, HttpServletResponse response) throws Exception { 2 //二维码中包含的信息 3 Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>(); 4 // 指定编码格式 5 hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); 6 7 //下面是毫秒级的时间戳 8 String tempPath = name.format(new Date()); 9 // 获取文件路径 本地使用 10 String path = System.getProperty("user.dir"); 11 String url = path+"/qrcode"; 12 File pathFile = new File(path+"/qrcode"+File.separator+tempPath); 13 // 指定纠错级别(L--7%,M--15%,Q--25%,H--30%) 14 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); 15 // try { 16 // 编码内容,编码类型(这里指定为二维码),生成图片宽度,生成图片高度,设置参数 17 BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints); 18 //设置请求头 19 response.setCharacterEncoding("UTF-8"); 20 response.setHeader("Content-Type", "application/octet-stream"); 21 //设置输出时的名称 22 response.setHeader("Content-Disposition", "attachment;filename=" + tempPath + ".png"); 23 String name = pathFile + ".png"; 24 Path file = new File(name).toPath(); 25 MatrixToImageWriter.writeToPath(bitMatrix, "png", file); 26 QRCode.ioReadImage(url,file.toString(), response); 27
1 public static void ioReadImage(String url,String imgUrl, HttpServletResponse response) throws Exception { 2 ServletOutputStream out = null; 3 FileInputStream ips = null; 4 try { 5 String imgPath = imgUrl; 6 ips = new FileInputStream(new File(imgPath)); 7 String type = imgUrl.substring(imgUrl.indexOf(".") + 1); 8 if (type.equals("png")) { 9 response.setContentType("image/png"); 10 } 11 if (type.equals("jpeg") || type.equals("jpg")) { 12 response.setContentType("image/jpeg"); 13 } 14 out = response.getOutputStream(); 15 //读取文件流 16 int len = 0; 17 byte[] buffer = new byte[1024 * 10]; 18 while ((len = ips.read(buffer)) != -1) { 19 out.write(buffer, 0, len); 20 } 21 out.flush(); 22 23 } catch (Exception e) { 24 e.printStackTrace(); 25 } finally { 26 out.close(); 27 ips.close(); 28 delAllFile(url); 29 } 30 }
1 //删除指定文件夹下所有文件 2 //param path 文件夹完整绝对路径 3 public static boolean delAllFile(String path) { 4 boolean flag = false; 5 File file = new File(path); 6 if (!file.exists()) { 7 return flag; 8 } 9 if (!file.isDirectory()) { 10 return flag; 11 } 12 String[] tempList = file.list(); 13 File temp = null; 14 for (int i = 0; i < tempList.length; i++) { 15 if (path.endsWith(File.separator)) { 16 temp = new File(path + tempList[i]); 17 } else { 18 temp = new File(path + File.separator + tempList[i]); 19 } 20 if (temp.isFile()) { 21 temp.delete(); 22 } 23 if (temp.isDirectory()) { 24 delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件 25 delFolder(path + "/" + tempList[i]);//再删除空文件夹 26 flag = true; 27 } 28 } 29 return flag; 30 }
