<!--引入生成二维码的依赖-->
<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.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.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Hashtable;
/**
* 二维码生成工具类
*/
public class QrCodeUtils {
private static final String CHARSET = "utf-8";
public static final String FORMAT = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int LOGO_WIDTH = 60;
// LOGO高度
private static final int LOGO_HEIGHT = 60;
/**
* 生成二维码
*
* @param content 二维码内容
* @param logoPath logo地址
* @param needCompress 是否压缩logo
* @return 图片
* @throws Exception
*/
public static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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 (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QrCodeUtils.insertImage(image, logoPath, needCompress);
return image;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param logoPath LOGO图片地址
* @param needCompress 是否压缩
* @throws IOException
*/
private static void insertImage(BufferedImage source, String logoPath,
boolean needCompress) throws Exception {
File file = new File(logoPath);
if (!file.exists()) {
System.err.println(""+logoPath+" 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > LOGO_WIDTH) {
width = LOGO_WIDTH;
}
if (height > LOGO_HEIGHT) {
height = LOGO_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();
}
/**
* 生成二维码（指定路径保存）
*
* @param content 内容
* @param imgPath logo图片地址（内嵌图片）
* @param destPath 生成二维码存放地址
* @param needCompress 是否压缩logo
* @throws Exception
*/
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QrCodeUtils.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, new File(destPath));
}
/**
* 生成二维码(直接将二维码以图片输出流返回）
*
* @param content 内容
* @param imgPath logo图片地址（内嵌图片）
* @param needCompress 是否压缩logo
* @return
* @throws Exception
*/
public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
BufferedImage image = QrCodeUtils.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();
}
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param logoPath LOGO地址
* @param output 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
ImageIO.write(image, FORMAT, output);
}
/**
* 获取指定文件的输入流，获取logo
*
* @param logoPath 文件的路径
* @return
*/
public static InputStream getResourceAsStream(String logoPath) {
return QrCodeUtils.class.getResourceAsStream(logoPath);
}
/**
* 解析二维码
*
* @param file
* 二维码图片
* @return
* @throws Exception
*/
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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
/**
* 解析二维码
*
* @param path
* 二维码图片地址
* @return
* @throws Exception
*/
public static String decode(String path) throws Exception {
return QrCodeUtils.decode(new File(path));
}
//测试一：
public static void main(String[] args) throws Exception {
String text = "https://blog.csdn.net/weixin_43763430";
String logoPath = "D:\\qrCode\\logo.jpg";
String destPath = "D:\\qrCode\\csdn.jpg";
QrCodeUtils.encode(text,logoPath,destPath,true);
}
}
工具类中的主方法是指定了二维码链接的内容是博客地址，并保存在D:\qrCode\csdn.jpg，二维码嵌套了头像的图片，期望实现的是生成二维码后被扫码直接进入到博客也没。如若不嵌入头像，直接将logoPath参数设为null。
//测试一：
public static void main(String[] args) throws Exception {
String text = "https://blog.csdn.net/weixin_43763430";
String logoPath = "D:\\qrCode\\logo.jpg";
String destPath = "D:\\qrCode\\csdn.jpg";
QrCodeUtils.encode(text,logoPath,destPath,true);
}
运行该主方法后，可在指定路径中看到生成的二维码图片。
运用spring boot生成二维码无需将保存二维码的图片，只须前端调用springboot接口即可在页面上显示二维码。实现了实时生成二维码。Controller层接口代码示例如下：
@GetMapping("/anon/coupon/qrCodeTest")
@ApiOperation(value = "获取二维码")
public void qrCodeTest(HttpServletResponse response) throws Exception {
String text = "https://blog.csdn.net/weixin_43763430";
String logoPath = "D:\\qrCode\\logo.jpg";
//String destPath = "D:\\qrCode\\csdn.jpg";
QrCodeUtils.encode(text,logoPath,response.getOutputStream(),true);
}
打开浏览器访问该接口地址，页面就会显示生成的二维码。扫描二维码即可进入到博客页面。
二维码运用到各种业务中，通常需要根据不同用户识别其相对应的内容，如以上示例是访问的博客主页面，如若想根据访问者传递的参数访问博客中特定的文章，文章访问各篇文章是用的get请求方式，即可根据传参实现get请求传入不同参数生成二维码的内容不同。
@GetMapping("/anon/coupon/qrCodeTest")
@ApiOperation(value = "获取二维码")
public void qrCodeTest(@RequestParam(value = "id") String id,HttpServletResponse response) throws Exception {
String text = "https://blog.csdn.net/weixin_43763430/article/details/" + id;
String logoPath = "D:\\qrCode\\logo.jpg";
//String destPath = "D:\\qrCode\\csdn.jpg";
QrCodeUtils.encode(text,logoPath,response.getOutputStream(),true);
}
用浏览器访问该接口地址，页面生成二维码，用手机扫描二维码即可跳转到博客中该篇文章页面。
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