依赖
<!-- 条形码、二维码生成 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>2.2</version>
</dependency>
代码
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import sun.font.FontDesignMetrics;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
/**
* 二维码的生成
*/
public class QRcreateUtile {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
private QRcreateUtile() {
}
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
}
}
return image;
}
public static void writeToFile(BitMatrix matrix, String format, File file)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format "
+ format + " to " + file);
}
}
public static void writeToFileBgTransparentAndAddFont(BitMatrix matrix, String format, File file, String addText)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
image = QRcreateUtile.transparentImage(image, 10);
QRcreateUtile.addFontImage(image, addText);
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format "
+ format + " to " + file);
}
}
public static void writeToStream(BitMatrix matrix, String format,
OutputStream stream) throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, stream)) {
throw new IOException("Could not write an image of format " + format);
}
}
/**
* 创建二维码
* @param cardNoName
* @param text
* @param vcode
* @param dirName
* @throws WriterException
* @throws IOException
*/
public static File wirter2File(String cardNoName,String text,String vcode,String dirName) throws WriterException, IOException {
//String text = "http://www.baidu.com"; // 二维码内容
int width = 300; // 二维码图片宽度
int height = 300; // 二维码图片高度
String format = "png";// 二维码的图片格式
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码
BitMatrix bitMatrix = new MultiFormatWriter().encode(text,
BarcodeFormat.QR_CODE, width, height, hints);
File directory = new File("");// 参数为空
String courseFile = directory.getCanonicalPath();
//System.out.println(courseFile);
String path = courseFile + File.separator + "dir" + File.separator + vcode + File.separator + dirName + File.separator;
File file = new File(path);
if(!file.exists()){//如果文件夹不存在
file.mkdir();//创建文件夹
}
// 生成二维码
File outputFile = new File( path + File.separator + cardNoName + ".png");
outputFile.mkdirs();
outputFile.createNewFile();
QRcreateUtile.writeToFileBgTransparentAndAddFont(bitMatrix, format, outputFile, cardNoName);
return outputFile;
}
/**
* 设置图片背景透明
* @param srcImage
* @param alpha
* @return
*/
public static BufferedImage transparentImage(BufferedImage srcImage, int alpha) throws IOException {
int imgHeight = srcImage.getHeight();//取得图片的长和宽
int imgWidth = srcImage.getWidth();
int c = srcImage.getRGB(3, 3);
//防止越位
if (alpha < 0) {
alpha = 0;
} else if (alpha > 10) {
alpha = 10;
}
BufferedImage tmpImg = new BufferedImage(imgWidth + 10, imgHeight + 10, BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage
for(int i = 0; i < imgWidth; ++i)//把原图片的内容复制到新的图片，同时把背景设为透明
{
for(int j = 0; j < imgHeight; ++j){
//把背景设为透明
if(srcImage.getRGB(i, j) == c){
tmpImg .setRGB(i, j, c & 0x00ffffff);
}
//设置透明度
else{
int rgb = tmpImg .getRGB(i, j);
rgb = ((alpha * 255 / 10) << 24) | (rgb & 0x00ffffff);
tmpImg .setRGB(i, j, rgb);
}
}
}
return tmpImg ;
}
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// 字体大小
private static final int FONT_SIZE = 18;
/**
* 添加 底部图片文字
*
* @param source 图片源
* @param declareText 文字本文
*/
private static void addFontImage(BufferedImage source, String declareText) throws IOException {
BufferedImage textImage = strToImage(declareText, QRCODE_SIZE, 50);
Graphics2D g2 = source.createGraphics();
//开启文字抗锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
int width = textImage.getWidth(null);
int height = textImage.getHeight(null);
Image src = textImage;
g2.drawImage(src, 0, QRCODE_SIZE - 40, width, height, null);
g2.dispose();
}
private static BufferedImage strToImage(String str, int width, int height) throws IOException {
BufferedImage textImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)textImage.getGraphics();
textImage = g2.getDeviceConfiguration()
.createCompatibleImage(width, height, Transparency.TRANSLUCENT);
g2.dispose();
g2 = textImage.createGraphics();
//开启文字抗锯齿
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setBackground(Color.WHITE);
g2.setPaint(Color.BLACK);
FontRenderContext context = g2.getFontRenderContext();
Font font = new Font("微软雅黑", Font.PLAIN, FONT_SIZE);
g2.setFont(font);
LineMetrics lineMetrics = font.getLineMetrics(str, context);
FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
float offset = (width - fontMetrics.stringWidth(str)) / 2;
float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;
g2.drawString(str, (int)offset, (int)y);
return textImage;
}
public static void main(String[] args) throws IOException, WriterException {
wirter2File("test","test","xxx" , "2021-11-11");
}
}
