1. 导包
<!-- 生成二维码 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.0</version>
</dependency>
2. 工具类
package com.springCloud.user.config.QRCode;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Base64;
/**
* bases64 与 照片, 照片流的相互转化
*/
public class ImgBase64 {
private static Base64.Encoder encoder = Base64.getEncoder();
private static Base64.Decoder decoder = Base64.getDecoder();
/**
* 照片转化为 bases64
*
* @param path 照片路径
* @param suffix 照片格式
* @return String
*/
public static String getImageBinary(String path, String suffix) {
File file = new File(path);
try {
BufferedImage read = ImageIO.read(file);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(read, suffix, byteArrayOutputStream);
byte[] bytes = byteArrayOutputStream.toByteArray();
return encoder.encodeToString(bytes);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 照片流转化为 bases64
*
* @param bufferedImage 照片流
* @param suffix 照片格式
* @return String
*/
public static String bufferedImageToBase64String(BufferedImage bufferedImage, String suffix) {
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, suffix, byteArrayOutputStream);
byte[] bytes = byteArrayOutputStream.toByteArray();
return encoder.encodeToString(bytes);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* bases64 转化为照片流
*
* @param base64String bases64
* @return String
*/
public static BufferedImage base64StringToBufferedImage(String base64String) {
try {
byte[] decode = decoder.decode(base64String);
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(decode);
return ImageIO.read(byteArrayInputStream);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* bases64 转化为照片
*
* @param base64String bases64
* @param path 照片生成的路径
* @param suffix 照片格式
*/
public static void base64StringToImage(String base64String, String path, String suffix) {
try {
byte[] decode = decoder.decode(base64String);
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(decode);
BufferedImage read = ImageIO.read(byteArrayInputStream);
File f1 = new File(path);
ImageIO.write(read, suffix, f1);
} catch (IOException e) {
e.printStackTrace();
}
}
}
3. 工具类
该工具包括的功能:
- 将生成二维码放在指定路径
- 将生成二维码以 base64 字符串形式存在
- 指定 LOGO 照片路径嵌入中生成二维码
- 指定 LOGO 的 base64 字符串嵌入中生成二维码
package com.springCloud.user.config.QRCode;
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.util.Hashtable;
import java.util.Random;
/**
* 生成二维码
*/
public class QRCode {
// 编码
private static final String CHARSET = "utf-8";
// 格式
private static final String FORMAT_NAME = "png";
// 二维码尺寸
private static final int QR_CODE_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 imgOrBase64, boolean judgeImgOrBase64, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
// 生成二维码的容错等级 M 为 中级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
// 生成二维码的字符编码
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
// 生成二维码的图片的黑线直接的边距
hints.put(EncodeHintType.MARGIN, 1);
// 二维码的生成
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QR_CODE_SIZE, QR_CODE_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);
}
}
// 插入图片
QRCode.insertImage(image, imgOrBase64, judgeImgOrBase64, needCompress);
return image;
}
/**
* 插入 LOGO
*
* @param source 二维码图片
* @param imgOrBase64 LOGO 图片的存在形式
* @param judgeImgOrBase64 判断 LOGO 存在形式
* @param needCompress 是否压缩
* @throws Exception Exception
*/
private static void insertImage(BufferedImage source, String imgOrBase64, boolean judgeImgOrBase64, boolean needCompress) throws Exception {
Image bufferedImage;
if (judgeImgOrBase64) {
File file = new File(imgOrBase64);
if (!file.exists()) {
System.err.println("" + imgOrBase64 + " 该文件不存在！");
return;
}
bufferedImage = ImageIO.read(new File(imgOrBase64));
} else {
bufferedImage = ImgBase64.base64StringToBufferedImage(imgOrBase64);
}
if (bufferedImage != null) {
int width = bufferedImage.getWidth(null);
int height = bufferedImage.getHeight(null);
// 压缩 LOGO
if (needCompress) {
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = bufferedImage.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();
bufferedImage = image;
}
// 插入 LOGO
Graphics2D graph = source.createGraphics();
int x = (QR_CODE_SIZE - width) / 2;
int y = (QR_CODE_SIZE - height) / 2;
graph.drawImage(bufferedImage, 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 (内嵌 LOGO)
*
* @param content 内容
* @param imgOrBase64 LOGO 存在形式
* @param judgeImgOrBase64 判断 LOGO 存在形式
* @param destPath 存放目录
* @param needCompress 是否压缩 LOGO
* @throws Exception Exception
*/
public String encode(String content, String imgOrBase64, boolean judgeImgOrBase64, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCode.createImage(content, imgOrBase64, judgeImgOrBase64, needCompress);
mkdirs(destPath);
String file = new Random().nextInt(99999999) + "." + FORMAT_NAME;
ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
return file;
}
/**
* 生成二维码 base64 (内嵌 LOGO)
*
* @param content 内容
* @param imgOrBase64 LOGO 存在形式
* @return base64String
* @throws Exception Exception
*/
public String encodeBase64String(String content, String imgOrBase64, boolean needCompress) throws Exception {
BufferedImage image = QRCode.createImage(content, imgOrBase64, false, needCompress);
return ImgBase64.bufferedImageToBase64String(image, FORMAT_NAME);
}
/**
* 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)
*
* @param destPath 存放目录
*/
private static void mkdirs(String destPath) {
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 解析二维码
*
* @param file 二维码图片
* @return String
* @throws Exception 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<>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
/**
* 解析二维码
*
* @param path 二维码图片地址
* @return String
* @throws Exception Exception
*/
public static String decode(String path) throws Exception {
return QRCode.decode(new File(path));
}
}