com.google.zxing
javase
3.3.0
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.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
*/
public static BufferedImage createImage(String content, String logoPath, 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 (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
*/
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
*/
public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
mkdirs(destPath);
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 二维码图片
*/
public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
return QrCodeUtils.createImage(content, imgPath, needCompress);
}
/**
* 创建多级文件
*
* @param destPath 目标目录
*/
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
*/
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 输入流
*/
public static InputStream getResourceAsStream(String logoPath) {
return QrCodeUtils.class.getResourceAsStream(logoPath);
}
/**
* 解析二维码
*
* @param file 二维码图片
* @return 解析结果
*/
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);
return result.getText();
}
/**
* 解析二维码
*
* @param path 二维码图片地址
* @return 二维码解析结果
*/
public static String decode(String path) throws Exception {
return QrCodeUtils.decode(new File(path));
}
}
@ApiOperation(value = "获取二维码")
GetMapping("/qrCode")
public void qrCodeTest(HttpServletResponse response) throws Exception {
// context是二维码里面的内容,如果是网址则会跳转到网址界面
String context = "lixianhe";
// 获取类路径下的logo文件
ClassPathResource resource = new ClassPathResource("static/logo.jpg");
//获logo.jpg的绝对路径
String logoPath = resource.getFile().getPath();
// String destPath = "D:\\qrCode\\csdn.jpg";
QrCodeUtils.encode(context, logoPath, response.getOutputStream(), true);
}
logo.jpg是二维码的logo图片可以作为二维码的中心部分,该图片放在resources文件夹下。
获取resources文件下的内容
ClassPathResource resource = new ClassPathResource("static/logo.jpg");
//获logo.jpg的绝对路径(在target文件夹下)
String logoPath = resource.getFile().getPath();
// 输出logo.jpg文件的绝对路径
System.out.println(logoPath);
控制台输出
C:\Users\86131\Desktop\xxx\ManyDataSource\ManyDataSource\target\classes\static\logo.jpg
访问接口,生成的二维码是以logo.jpg为中心的
扫码:可以查看到字符串 "lixianhe"