该工具类使用google.zxing实现二维码生成
可生成通用二维码和带中心图标的二维码
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.HashMap;
import javax.imageio.ImageIO;
import org.apache.log4j.Logger;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
public class QRUtil {
private static Logger log = Logger.getLogger(QRUtil.class);
//定义二维码宽度
private static final int width = 300;
//定义二维码高度
private static final int height = 300;
//定义二维码图片格式
private static final String format = "png";
private static final int BLACK = 0xFF000000;//用于设置图案的颜色
private static final int WHITE = 0xFFFFFFFF;//用于背景色
/**
* 将二维码内容生成通用二维码
* 记得删除临时文件
* @param qrContent
* @param fileName
* @return
* @throws Exception
*/
public static File generateQR(String qrContent, String fileName) throws Exception{
log.info("QRUtil: start generate qrCode...");
//定义二维码的参数
HashMap<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
hints.put(EncodeHintType.MARGIN, 2);
//生成二维码
BitMatrix bitMatrix = new MultiFormatWriter().encode(qrContent, BarcodeFormat.QR_CODE, width, height);
//二维码删除白边
bitMatrix = deleteWhite(bitMatrix);
//创建临时文件
File file = File.createTempFile(fileName, ".png");
Path path = file.toPath();
MatrixToImageWriter.writeToPath(bitMatrix, format, path);
return file;
}
/**
* 将二维码内容和小图标logo
* 记得删除临时文件
* @param qrContent
* @param fileName
* @param is
* @return
* @throws Exception
*/
public static File generateQR(String qrContent, String fileName, InputStream logoIs)throws Exception{
log.info("QRUtil: start generate qrCode...");
//定义二维码的参数
HashMap<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
hints.put(EncodeHintType.MARGIN, 2);
//生成二维码
BitMatrix bitMatrix = new MultiFormatWriter().encode(qrContent, BarcodeFormat.QR_CODE, width, height);
//二维码删除白边
bitMatrix = deleteWhite(bitMatrix);
//创建临时文件
File file = File.createTempFile(fileName, ".png");
//创建文件缓存
BufferedImage bufferedImage = toBufferedImage(bitMatrix);
//小图标写入二维码
dealIcon(bufferedImage, logoIs);
ImageIO.write(bufferedImage, format, file);
return file;
}
/**
* BitMatrix转换成BufferedImage
* @param matrix
* @return
*/
private 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;
}
/**
* 小图标写入二维码
* @param matrixImage
* @param logoIs
* @throws IOException
*/
private static void dealIcon(BufferedImage matrixImage, InputStream logoIs) throws IOException {
Graphics2D g2 = matrixImage.createGraphics();
int matrixWidth = matrixImage.getWidth();
int matrixHeigh = matrixImage.getHeight();
// 读取logo图片
BufferedImage logo = ImageIO.read(logoIs);
//开始绘制图片
g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制
BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke);// 设置笔画对象
//指定弧度的圆角矩形
RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);
g2.setColor(Color.white);
g2.draw(round);// 绘制圆弧矩形
//设置logo 有一道灰色边框
BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
g2.setStroke(stroke2);// 设置笔画对象
RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);
g2.setColor(new Color(128,128,128));
g2.draw(round2);// 绘制圆弧矩形
g2.dispose();
matrixImage.flush();
}
/**
* 二维码删除白边
* @param matrix
* @return
*/
private static BitMatrix deleteWhite(BitMatrix matrix) {
int[] rec = matrix.getEnclosingRectangle();
int resWidth = rec[2] + 1;
int resHeight = rec[3] + 1;
BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
resMatrix.clear();
for (int i = 0; i < resWidth; i++) {
for (int j = 0; j < resHeight; j++) {
if (matrix.get(i + rec[0], j + rec[1]))
resMatrix.set(i, j);
}
}
return resMatrix;
}
}