java实现手机扫描二维码后网站跳转新页面，提供zxing和hutools的方式实现二维码的生成，动态刷新，验证跳转功能。
1.效果图：
二维码设置有效时间
失效重新获取二维码
手机扫描二维码成功后网站跳转新页面
2.后端代码：
/**
* @description 二维码控制器
*/
@Controller
public class QrcodeController {
@Autowired
private RedisUtils redisUtils;
/**
* @description 二维码页面
* @return java.lang.String
**/
@GetMapping({"/","/index"})
public String index(ModelMap modelMap){
modelMap.put("userId", 1);
return "index";
}
/**
* @description 生成二维码
* @param request
* @Param response
* @return void
**/
@GetMapping("/getQrcode")
@ResponseBody
public void getQrcode(HttpServletRequest request, HttpServletResponse response) throws Exception {
//二维码中的链接，需要公网网址才可以用手机扫描出来，本地测试开通natapp进行内网渗透
String url = "http://qh22wg.natappfree.cc/scanQrcode";
//过期时间，30s
long expireTime = 30;
//设置参数
String random = request.getParameter("random");
String userId = request.getParameter("userId");
//生成二维码唯一标识
String key = String.valueOf(System.currentTimeMillis());
//设置二维码过期时间
redisUtils.set(key,random,expireTime);
//二维码中的内容
String content = url + "?key=" + key + "&userId=" + userId;
//二维码图片中间logo
String imgPath = null;
Boolean needCompress = true;
//拿到图片流
ByteArrayOutputStream out = QRCodeUtil.encodeIO(content, imgPath, needCompress);
//返回二维码
response.setCharacterEncoding("UTF-8");
response.setContentType("image/jpeg;charset=UTF-8");
response.setContentLength(out.size());
ServletOutputStream outputStream = response.getOutputStream();
outputStream.write(out.toByteArray());
outputStream.flush();
outputStream.close();
}
/**
* @description 扫描二维码
* @param request
* @Param key
* @Param userId
* @return java.lang.String
**/
@GetMapping("/scanQrcode")
@ResponseBody
public String scanQrcode(HttpServletRequest request, String key, String userId) throws Exception {
if(redisUtils.exists(key)){
redisUtils.set(userId + "_qrcode_status", "success");
return "扫描成功";
}
return "二维码失效, 请重新扫描";
}
/**
* @description 验证扫描二维码
* @param userId
**/
@RequestMapping("/confirmQrcode")
@ResponseBody
public AjaxResult confirmQrcode(String userId){
if(redisUtils.exists(userId + "_qrcode_status")){
redisUtils.remove(userId + "_qrcode_status");
//扫描成功后跳转新链接
return AjaxResult.success("扫描成功", "/success");
}
return AjaxResult.error("二维码失效, 请重新扫描");
}
/**
* @description 扫描二维码成功跳转页面
* @param
* @return java.lang.String
**/
@GetMapping("/success")
public String success(ModelMap modelMap){
return "success";
}
}
zxing生成二维码工具：
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 = 60;
// LOGO高度
private static final int HEIGHT = 60;
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
QRCodeUtil.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();
}
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
ImageIO.write(image, FORMAT_NAME, new File(destPath));
}
public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.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 {
QRCodeUtil.encode(content, imgPath, destPath, false);
}
public static byte[] getQRCodeImage(String content) throws WriterException, IOException {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE);
ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, FORMAT_NAME, pngOutputStream);
byte[] pngData = pngOutputStream.toByteArray();
return pngData;
}
public static void encode(String content, String destPath) throws Exception {
QRCodeUtil.encode(content, null, destPath, false);
}
public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
public static void encode(String content, OutputStream output) throws Exception {
QRCodeUtil.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 QRCodeUtil.decode(new File(path));
}
//获取生成二维码的图片流
public static ByteArrayOutputStream encodeIO(String content,String imgPath,Boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath,
needCompress);
//创建储存图片二进制流的输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//将二进制数据写入ByteArrayOutputStream
ImageIO.write(image, "jpg", baos);
return baos;
}
}3.demo下载：https://download.csdn.net/download/weixin_39220472/33632560