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二维码
扫码原理
实现代码
工具类
1
import com.google.zxing.LuminanceSource;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
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);
}
}
2
import com.google.zxing.*;
import com.google.zxingmon.BitMatrix;
import com.google.zxingmon.HybridBinarizer;
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.OutputStream;
import java.util.Hashtable;
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));
}
}
3
@Component
public class RedisUtils {
@Autowired
private StringRedisTemplate stringRedisTemplate;
public void set(String key, Object object, Long time) {
// 让该方法能够支持多种数据类型存放
if (object instanceof String) {
setString(key, object);
}
// 如果存放时Set类型
if (object instanceof Set) {
setSet(key, object);
}
// 设置有效期
if (time != null) {
stringRedisTemplate.expire(key, time, TimeUnit.SECONDS);
}
}
public void setString(String key, Object object) {
String value = (String) object;
// 存放string类型
stringRedisTemplate.opsForValue().set(key, value);
}
public void setSet(String key, Object object) {
Set<String> valueSet = (Set<String>) object;
for (String string : valueSet) {
stringRedisTemplate.opsForSet().add(key, string);
}
}
public String getString(String key) {
return stringRedisTemplate.opsForValue().get(key);
}
public boolean delete(String key) {
return stringRedisTemplate.delete(key);
}
}
pom 多加如下依赖
<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>
<!--freemarker-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
yml
server:
servlet:
context-path: /
port: 8088
spring:
application:
name: utils
redis:
database: 0
host: 127.0.0.1
port: 6379
password: root
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
#token更新地址，此地址需要外网地址才行，使用natapp穿透下 https://blog.csdn/qq_40673786/article/details/90298955
baseImgUrl: http://xdc5z3.natappfree/updateTokenState?token=
#二维码log图片地址
bgImgPath: F:/a.jpg
QRCodeController
@Controller
public class QRCodeController {
@Autowired
private RedisUtils redisUtils;
@Value("${baseImgUrl}")
private String baseImgUrl;
@Value("${bgImgPath}")
private String bgImgPath;
//生成token地址
@RequestMapping(value = "/generateCode")
@ResponseBody
public String generateCode() throws Exception {
// 1.生成token令牌
String token = UUID.randomUUID().toString().replace("-", "");
// 2.存入到redis中
redisUtils.setString(token, "0");
// 3.生成图形验证码 在验证码中传递该参数
String codeText = baseImgUrl + token;
String destPath = "F:/code/" + token + ".png";
// 4.将二维码写入到本地文件中
QRCodeUtil.encode(codeText, bgImgPath, destPath, true);
return token;
}
//获取生成的二维码图片
@RequestMapping(value = "/getCodeImg", produces = MediaType.IMAGE_JPEG_VALUE)
@ResponseBody
public byte[] getCodeImg(String token) throws IOException {
File file = new File("F:/code/" + token + ".png");
FileInputStream inputStream = new FileInputStream(file);
byte[] bytes = new byte[inputStream.available()];
inputStream.read(bytes, 0, inputStream.available());
return bytes;
}
//跳到扫码页
@RequestMapping("/")
public String index(String token, HttpServletRequest request) {
request.setAttribute("token", token);
return "index";
}
//扫描二维码时调用此接口，二维码内容即此接口地址
@RequestMapping("/updateTokenState")
@ResponseBody
public String updateTokenState(String token) {
if (StringUtils.isEmpty(token)) {
return "扫码登陆失败!";
}
// 将token状态改为1
redisUtils.setString(token, "1");
return "扫码登陆成功!";
}
//前端检测redistoken是否被更改，即是否已经扫过码了
@RequestMapping("/checkToken")
@ResponseBody
public boolean checkToken(String token) {
if (StringUtils.isEmpty(token)) {
return false;
}
String redisValue = redisUtils.getString(token);
if (StringUtils.isEmpty(redisValue)) {
return false;
}
if (!redisValue.equals("1")) {
return false;
}
return true;
}
//扫过码之后要跳转的地址
@ResponseBody
@RequestMapping("/sweepCode")
public String sweepCode() {
return "扫码登录成功！";
}
}
App
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
index.ftl 此ftl在resources/templates文件夹下
<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/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>
测试 前提 1、启动redis 2、生成外网地址
第一步
http://localhost:8088/generateCode 生成token
第二步
http://localhost:8088/?token=上述生成的token
查看生成到本地F://code/下的的二维码
http://localhost:8088/getCodeImg?token=上述生成的token
思想来源
www.mayikt/
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