二维码生成及扫描，查看附件

前面先附上代码，具体的类方法放在最后//二维码生成地址String path = "C:/qrCode/"+sdf.format(new Date())+"/"+id+".jpg";// 生成二维码String content = "http://221.6.30.xxx:xxxx/xxxx/xx/xxxx.do?rowId="+id;QrCodeCreateUtil.encode(content, path);

展示二维码前台jsp：

<table class="table table-condensed table-hover"><tbody><tr><td align="center"><img src="<%=basePath%>xx/QR-code-show.do?rowId=${xxxxxxx.rowId}"></td></tr></tbody>
</table>

后台二维码显示并下载

@RequestMapping(method = RequestMethod.GET, value = "QR-code-show")
public void xxxxx(String rowId, HttpServletRequest request, HttpServletResponse response) throws IOException {if(rowId != null && rowId.length() > 0){//我是通过rowId获取的二维码路径String qrCode = equipmentInfo.getQrCode();//附件String fileName = equipmentInfo.getManagerNum()+".jpg";FileUtil fileHelper = new FileUtil();//下载fileHelper.downloadFile(qrCode, request, response, fileName);}
}

/*** 下载文件* * @param downLoadPath*            下载路径* @param response* @param fileName*            文件名*/
public void downloadFile(String downLoadPath, HttpServletRequest request,HttpServletResponse response, String fileName) {BufferedInputStream bis = null;BufferedOutputStream bos = null;try {long fileLength = new File(downLoadPath).length();/** response.setContentType("application/x-msdownload;");* response.setHeader("Content-disposition", "attachment; filename="* + fileName);*/String userAgent = request.getHeader("User-Agent");// 针对IE或者以IE为内核的浏览器：if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {fileName = URLEncoder.encode(fileName, "UTF-8");} else {// 非IE浏览器的处理：fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");}response.setHeader("Content-disposition",String.format("attachment; filename=\"%s\"", fileName));response.setContentType("application/octet-stream;charset=utf-8");response.setCharacterEncoding("UTF-8");response.setHeader("Content-Length", String.valueOf(fileLength));bis = new BufferedInputStream(new FileInputStream(downLoadPath));bos = new BufferedOutputStream(response.getOutputStream());byte[] buff = new byte[2048];int bytesRead;while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {bos.write(buff, 0, bytesRead);}} catch (Exception e) {e.printStackTrace();} finally {if (bis != null) {try {bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (bos != null) {try {bos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

根据生成二维码存放的content 扫描发送请求 "http://221.6.30.xxx:xxxx/xxxx/xx/xxxx.do?rowId="+id;

/*** 查看设备信息（二维码扫描）* @param rowId* @param model* @return*/
@RequestMapping("get-sb-info")
public String getSbInfo(@RequestParam(value = "rowId") String rowId, Model model) {String returnPage = "xx/xxxx";if (rowId != null) {EquipmentInfo equipmentInfo = equipmentInfoManager.get(rowId);model.addAttribute("equipmentInfo", equipmentInfo);List<FileRecord> fileList = fileRecordManager.findBy("relationId", rowId);model.addAttribute("fileList", fileList);}else{returnPage = "";}return returnPage;
}

跳转jsp后显示内容

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ include file="/common/taglibs.jsp"%>
<%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<base href="<%=basePath %>">
<html>
<body style="text-align: center;margin: 0px;padding: 0px;">
<div style="margin:0 auto;width: 100%;"><table  class="bordertable" cellpadding="0" cellspacing="0"><tr><td align="right" class="titlebg">xxxx：</td><td align="left">${equipmentInfo.workStatus}</td></tr><c:forEach items="${fileList}" var="file"><tr><td colspan="2" width="100%"><img src="<%=basePath%>fileRecord/fileDownload.do?fileId=${file.rowId}" width="100%"></td></tr></c:forEach></table>
</div>
</body>
</html>

最后显示下载文件

/*** 附件下载* * @param fileId*            文件ID* @return 下载* @throws IOException*/
@RequestMapping(method = RequestMethod.GET, value = "fileDownload")
public void fileDownLoad(String fileId, HttpServletRequest request,HttpServletResponse response) throws IOException {FileRecord fileRecord = fileRecordManager.get(fileId);String filePath = fileRecord.getFilePath();String fileName = fileRecord.getFileName();FileUtil fileHelper = new FileUtil();fileHelper.downloadFile(filePath, request, response, fileName);
}

最后贴上二维码类 zxing-code-2.3.jar

package com.gx.soft.common.util;import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;import java.util.Hashtable;public class QrCodeCreateUtil {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 = 60;// LOGO高度private static final int HEIGHT = 60;// /**
//  * 生成包含字符串信息的二维码图片
//  * @param outputStream 输出流
//  * @param content 字符串信息
//  * @param qrCodeSize 二维码图片大小
//  * @param imageFormat 二维码的格式
//  * @return
//  * @throws WriterException
//  * @throws IOException
//  */
// public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{
//    //设置二维码纠错级别Map
//    Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
//    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别
//    QRCodeWriter qrCodeWriter = new QRCodeWriter();
//    //创建比特矩阵(位矩阵)的QR码编码的字符串
//    BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
//    // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
//    int matrixWidth = byteMatrix.getWidth();
//    BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);
//    image.createGraphics();
//    Graphics2D graphics = (Graphics2D) image.getGraphics();
//    graphics.setColor(Color.WHITE);
//    graphics.fillRect(0, 0, matrixWidth, matrixWidth);
//    // 使用比特矩阵画并保存图像
//    graphics.setColor(Color.BLACK);
//    for (int i = 0; i < matrixWidth; i++){
//       for (int j = 0; j < matrixWidth; j++){
//          if (byteMatrix.get(i, j)){
//             graphics.fillRect(i-100, j-100, 1, 1);
//          }
//       }
//    }
//    return ImageIO.write(image, imageFormat, outputStream);
// }private 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QrCodeCreateUtil.insertImage(image, imgPath, needCompress);return image;}private 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 File(imgPath));int width = src.getWidth(null);int height = src.getHeight(null);if (needCompress) { // 压缩LOGOif (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LOGOGraphics2D 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();}public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {BufferedImage image = QrCodeCreateUtil.createImage(content, imgPath, needCompress);mkdirs(destPath);// String file = new Random().nextInt(99999999)+".jpg";// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));ImageIO.write(image, FORMAT_NAME, new File(destPath));}public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {BufferedImage image = QrCodeCreateUtil.createImage(content, imgPath, needCompress);return image;}public static void mkdirs(String destPath) {File file = new File(destPath);// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)if (!file.exists() && !file.isDirectory()) {file.mkdirs();}}public static void encode(String content, String imgPath, String destPath) throws Exception {QrCodeCreateUtil.encode(content, imgPath, destPath, false);}public static void encode(String content, String destPath) throws Exception {QrCodeCreateUtil.encode(content, null, destPath, false);}public static void encode(String content, String imgPath, OutputStream output, boolean needCompress) throws Exception {BufferedImage image = QrCodeCreateUtil.createImage(content, imgPath, needCompress);ImageIO.write(image, FORMAT_NAME, output);}public static void encode(String content, OutputStream output) throws Exception {QrCodeCreateUtil.encode(content, null, output, false);}public static String decode(File file) throws Exception {BufferedImage image;image = ImageIO.read(file);if (image == null) {return null;}BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));Result result;Hashtable hints = new Hashtable();hints.put(DecodeHintType.CHARACTER_SET, CHARSET);result = new MultiFormatReader().decode(bitmap, hints);String resultStr = result.getText();return resultStr;}public static String decode(String path) throws Exception {return QrCodeCreateUtil.decode(new File(path));}}

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