定制专属二维码思路——实现【微信,QQ】扫码登录
2019-05-21 07:15
2501 查看
效果演示
1.先在natapp实现外网映射(https://natapp.cn)
2.natapp.exe
3.生成token链接(先开启redis)
//生成二维码token链接(生成二维码) http://p5gc9b.natappfree.cc/generateCode
//浏览器展示二维码 http://p5gc9b.natappfree.cc/getCodeImg?token=736e39d6c1424f4294958353206c1e06
用QQ或者微信扫描网页二维码
手机QQ和微信扫码登陆原理解密
- 使用java的二维码框架生成二维码 底层存放该链接地址
/updateTokenState?token=uuid
2.如何保证二维码不允许重复问题,使用token不重复就可以了
将该token存放在redis中,key:token value 状态码
Key:token value 状态码 默认状态0
0表示没有扫过,1表示已经扫过
二维码是如何生成的
- 在线二维码生成方式 (http://www.liantu.com/)
- 使用Java语言生成google框架
- 前端方式生成二维码jquery-qrcode
使用Java语言生成二维码
Maven依赖
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> </parent> <dependencies> <!-- sprinboot web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--java二维码生成框架 --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> <!-- 集成redis --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> </dependencies>
核心方法
public class BufferedImageLuminanceSource extends LuminanceSource { private final BufferedImage image; private final int left; private final int top; public BufferedImageLuminanceSource(BufferedImage image) { this(image, 0, 0, image.getWidth(), image.getHeight()); } public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) { super(width, height); int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); if (left + width > sourceWidth || top + height > sourceHeight) { throw new IllegalArgumentException("Crop rectangle does not fit within image data."); } for (int y = top; y < top + height; y++) { for (int x = left; x < left + width; x++) { if ((image.getRGB(x, y) & 0xFF000000) == 0) { image.setRGB(x, y, 0xFFFFFFFF); // = white } } } this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY); this.image.getGraphics().drawImage(image, 0, 0, null); this.left = left; this.top = top; } public byte[] getRow(int y, byte[] row) { if (y < 0 || y >= getHeight()) { throw new IllegalArgumentException("Requested row is outside the image: " + y); } int width = getWidth(); if (row == null || row.length < width) { row = new byte[width]; } image.getRaster().getDataElements(left, top + y, width, 1, row); return row; } public byte[] getMatrix() { int width = getWidth(); int height = getHeight(); int area = width * height; byte[] matrix = new byte[area]; image.getRaster().getDataElements(left, top, width, height, matrix); return matrix; } public boolean isCropSupported() { return true; } public LuminanceSource crop(int left, int top, int width, int height) { return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); } public boolean isRotateSupported() { return true; } public LuminanceSource rotateCounterClockwise() { int sourceWidth = image.getWidth(); int sourceHeight = image.getHeight(); AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth); BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY); Graphics2D g = rotatedImage.createGraphics(); g.drawImage(image, transform, null); g.dispose(); int width = getWidth(); return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); } }
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; 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; } 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); // 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 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); } // 被注释的方法 /* * public static void encode(String content, String destPath, boolean * needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath, * needCompress); } */ 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)); } }
手机QQ扫码登陆原理
- 生成二维码,链接存放该Token 该状态是为登陆状态
- 前端使用ajax定时发送请求,检查该token是否为登陆状态
- 用户扫码的时候,获取该连接将token状态该为登陆状态
核心代码
@Controller public class QrCodeController { @Autowired private RedisUtil redisUtil; private String baseImgUrl = "http://p5gc9b.natappfree.cc/updateTokenState?token="; /** * 提供创建二维码接口 * * @return */ @RequestMapping("/generateCode") @ResponseBody public String generateCode() throws Exception { // 1.生成token String token = UUID.randomUUID().toString().replace("-", ""); // 2. 存放在redis中 0 表示没有被扫过,1表示已经扫过 redisUtil.setString(token, "0"); // 3.生成二维码 // 存放在二维码中的内容 // 嵌入二维码的图片路径 String imgPath = "E:/code/code_bg.png"; // 生成的二维码的路径及名称 String destPath = "E:/code/" + token + ".png"; //生成二维码 QRCodeUtil.encode(baseImgUrl + token, imgPath, destPath, true); // 解析二维码 String str = QRCodeUtil.decode(destPath); // 打印出解析出的内容 return token; } /** * 根据Token返回对应的二维码 * * @param token * @return * @throws IOException */ @RequestMapping(value = "/getCodeImg", produces = MediaType.IMAGE_JPEG_VALUE) @ResponseBody public byte[] getCodeImg(String token) throws IOException { File file = new File("E:/code/" + token + ".png"); FileInputStream inputStream = new FileInputStream(file); byte[] bytes = new byte[inputStream.available()]; inputStream.read(bytes, 0, inputStream.available()); return bytes; } /** * 根据token展示页面的二维码 * * @param token * @param request * @return */ @RequestMapping("/") public String index(String token, HttpServletRequest request) { request.setAttribute("token", token); return "index"; } /** * 用户扫码 将该token 的状态改为1 * * @param token * @return */ @RequestMapping("/updateTokenState") @ResponseBody public String updateTokenState(String token) { if (StringUtils.isEmpty(token)) { return "token 不能为空!"; } // 将该token的状态改为1 redisUtil.setString(token, "1"); return "<h1>用户扫码成功!</h1>"; } /** * 前端使用定时器检查token状态 * * @param token * @return */ @RequestMapping("/checkToken") @ResponseBody public Boolean checkToken(String token) { if (StringUtils.isEmpty(token)) { return false; } String redisValue = redisUtil.getString(token); if (StringUtils.isEmpty(redisValue)) { return false; } if (!redisValue.equals("1")) { return false; } return true; } @RequestMapping("/sweepCode") @ResponseBody public String sweepCode() { return "恭喜您,扫码登陆成功!"; } }
Application相关配置
spring: http: encoding: force: true charset: UTF-8 redis: host: 127.0.0.1 port: 6379 # password: 123456 freemarker: allow-request-override: false cache: false check-template-location: true charset: UTF-8 content-type: text/html; charset=utf-8 expose-request-attributes: false expose-session-attributes: false expose-spring-macro-helpers: false suffix: .ftl template-loader-path: classpath:/templates server: port: 8080
RedisUtils
@Component public class RedisUtil { @Autowired private StringRedisTemplate stringRedisTemplate; // 如果key存在的话返回fasle 不存在的话返回true public Boolean setNx(String key, String value, Long timeout) { Boolean setIfAbsent = stringRedisTemplate.opsForValue().setIfAbsent(key, value); if (timeout != null) { stringRedisTemplate.expire(key, timeout, TimeUnit.SECONDS); } return setIfAbsent; } public StringRedisTemplate getStringRedisTemplate() { return stringRedisTemplate; } public void setList(String key, List<String> listToken) { stringRedisTemplate.opsForList().leftPushAll(key, listToken); } /** * 存放string类型 * * @param key * key * @param data * 数据 * @param timeout * 超时间 */ public void setString(String key, String data, Long timeout) { try { stringRedisTemplate.opsForValue().set(key, data); if (timeout != null) { stringRedisTemplate.expire(key, timeout, TimeUnit.SECONDS); } } catch (Exception e) { } } /** * 开启Redis 事务 */ public void begin() { // 开启Redis 事务权限 stringRedisTemplate.setEnableTransactionSupport(true); // 开启事务 stringRedisTemplate.multi(); } /** * 提交事务 */ public void exec() { // 成功提交事务 stringRedisTemplate.exec(); } /** * 回滚Redis 事务 */ public void discard() { stringRedisTemplate.discard(); } /** * 存放string类型 * * @param key * key * @param data * 数据 */ public void setString(String key, String data) { setString(key, data, null); } /** * 根据key查询string类型 * * @param key * @return */ public String getString(String key) { String value = stringRedisTemplate.opsForValue().get(key); return value; } /** * 根据对应的key删除key * * @param key */ public Boolean delKey(String key) { return stringRedisTemplate.delete(key); } }
index.ftl
<h1>扫一下该二维码,实现扫码登陆</h1> <img src="getCodeImg?token=${token}"> <script src="http://code.jquery.com/jquery-latest.js"></script> <script> function checkToken() { // alert('1000'); $.ajax({ url: "checkToken?token=${token}", dataType: "json", type: "get", async: "false", success: function (data) { if (data == true) { window.location.href = '/sweepCode'; } } , error: function () { } }) ; } setInterval(checkToken, 2000); </script>
启动类
(adsbygoogle = window.adsbygoogle || []).push({});@SpringBootApplication public class AppQrCode { public static void main(String[] args) { SpringApplication.run(AppQrCode.class); } }
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