目录
【复制即用】实现通过扫描生成的二维码跳转到指定网页，也可实现扫描二维码显示文本或图片
【复制即用】实现通过扫描生成的二维码跳转到指定网页，也可实现扫描二维码显示文本或图片
1.0.导入依赖坐标
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>1.1.1导入谷歌提供的帮助类(前置)
import com.google.zxing.LuminanceSource;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
/**
* 二维码生成解析帮助(二维码图片缓存)类
*
* @Author 周兆宇
* @Date 2022-01-21 14:17:01
*/
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) {
// = white
image.setRGB(x, y, 0xFFFFFFFF);
}
}
}
this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);
this.left = left;
this.top = top;
}
@Override
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;
}
@Override
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;
}
@Override
public boolean isCropSupported() {
return true;
}
@Override
public LuminanceSource crop(int left, int top, int width, int height) {
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
}
@Override
public boolean isRotateSupported() {
return true;
}
@Override
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);
}
}1.1.工具类
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import javax.imageio.ImageIO;
/**
* 二维码生成解析工具类
*
* @Author 周兆宇
* @Date 2022-01-21 14:17:01
*/
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);
// 压缩LOGO
if (needCompress) {
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();
// 绘制缩小后的图
g.drawImage(image, 0, 0, null);
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 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));
}
}1.2.入参类
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import java.io.Serializable;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @Description: 生成二维码入参类
* @Author: 周兆宇
* @Date: 2022-01-24 16:57:08
*/
@AllArgsConstructor
@NoArgsConstructor
@Builder
@Data
@ApiModel("生成二维码入参类")
public class QrCodeReq implements Serializable {
private static final long serialVersionUID = -3535741618235811221L;
@ApiModelProperty("存放在二维码中的内容(全地址路径)")
private String text;
@ApiModelProperty("生成的二维码的路径及名称")
private String destPath;
}
1.3.controller层
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import javax.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @Description: 二维码生成解析控制层
* @Author: 周兆宇
* @Date: 2022-01-24 17:01:22
*/
@RestController
@Slf4j
@Api(tags = "二维码生成解析API")
@RequestMapping("/qrCode")
public class QrCodeController {
@Resource
private QrCodeFacade qrCodeService;
@ApiOperation(value = "二维码生成与解析")
@PostMapping("/buildQrCode")
public Result buildQrCode(@RequestBody QrCodeReq qrCodeReq) {
return qrCodeService.buildQrCode(qrCodeReq);
}
}
1.4.service层
/**
* @Description: 二维码生成解析服务接口
* @Author: 周兆宇
* @Date: 2022-01-24 17:04:14
*/
public interface QrCodeFacade {
/**
* 功能描述: 二维码生成并解析
*
* @param qrCodeReq
* @return com.dianliantech.common.model.Result
* @author 周兆宇
* @date 2022-01-24 17:12:44
*/
Result buildQrCode(QrCodeReq qrCodeReq);
}
1.5.业务逻辑处理层
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
/**
* @Description: 二维码生成解析逻辑处理层
* @Author: 周兆宇
* @Date: 2022-01-24 17:34:05
*/
@Component
@Slf4j
public class QrCommand {
/**
* 功能描述: 生成和解析二维码
*
* @param qrCodeReq
* @return Result
* @author 周兆宇
* @date 2022-01-24 17:42:24
*/
public Result buildQrCode(QrCodeReq qrCodeReq) {
try {
// 生成二维码 二维码内容 嵌入二维码的图片路径; 图片存储路径; 是否将嵌入二维码的图片进行压缩
QrCodeUtil.encode(qrCodeReq.getText(), null, qrCodeReq.getDestPath(),
false);
// 解析二维码(传入要解析的二维码地址即可)
QrCodeUtil.decode(qrCodeReq.getDestPath());
// 返回二维码存放路径
return Result.succeed(qrCodeReq.getDestPath());
} catch (Exception e) {
return Result.failed(e.toString());
}
}
}1.6 测试示例
public class QrCodeTest {
public static void main(String[] args) throws Exception {
// 存放在二维码中的内容
String text = "文本内容/需要扫描后跳转的全路径地址";
// 嵌入二维码的图片路径
String imgPath = "D:/qrCode/1.jpg";
// 生成的二维码的路径及名称
String destPath = "D:/qrCode/qrcode/test.jpg";
//生成二维码
QRCodeUtil.encode(text, imgPath, destPath, true);
// 解析二维码
String str = QRCodeUtil.decode(destPath);
// 打印出解析出的内容
System.out.println(str); //： 文本内容/路径地址
}
}