import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;import javax.imageio.ImageIO;
import javax.swing.ImageIcon;public class ImageUtil {/**
* 图片去白色的背景,并裁切
*
* @param image 图片
* @param range 范围 1-255 越大 容错越高 去掉的背景越多
* @return 图片
* @throws Exception 异常
*/
public static BufferedImage transferAlpha(BufferedImage bufferedImage, int range) throws Exception {
BufferedImage sub = null;
try {
ImageIcon imageIcon = new ImageIcon(bufferedImage);
Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon
.getImageObserver());
int alpha = 0;
int minX = bufferedImage.getWidth();
int minY = bufferedImage.getHeight();
int maxX = 0;
int maxY = 0; for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage
.getHeight(); j1++) {
for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage
.getWidth(); j2++) {
int rgb = bufferedImage.getRGB(j2, j1); int R = (rgb & 0xff0000) >> 16;
int G = (rgb & 0xff00) >> 8;
int B = (rgb & 0xff);
if (((255 - R) < range) && ((255 - G) < range) && ((255 - B) < range)) { //去除白色背景;
rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
} else {
minX = minX <= j2 ? minX : j2;
minY = minY <= j1 ? minY : j1;
maxX = maxX >= j2 ? maxX : j2;
maxY = maxY >= j1 ? maxY : j1;
}
bufferedImage.setRGB(j2, j1, rgb);
}
}
int width = maxX - minX;
int height = maxY - minY;
sub = bufferedImage.getSubimage(minX, minY, width, height);
ImageIO.write(sub, "png", new File("D:/new.png"));
} catch (Exception e) {
e.printStackTrace();
throw e;
} return sub;
}
}
去掉白色背景,并剪切成透明背景。
二维码生成并抠图
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
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;
public String generateQRCode(String url) {checkNotNull(url, ErrorCode.ERROR_ILLEGAL_PARAMTER);log.error("二维码生成:url{}", url);
int width = 300;
int height = 300;
String uploadFileToQiniu = null;
Map<EncodeHintType, String> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = null;
try {
bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);
BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix);
BufferedImage transferAlpha = ImageUtil.transferAlpha(bufferedImage, 1);
if (transferAlpha == null) {
throw new BusinessException(ErrorCode.ERROR_ALPHA);// 抠图失败
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(transferAlpha, "png", out);
byte[] b = out.toByteArray();
} catch (Exception e) {
throw new BusinessException(ErrorCode.ERROR_QRCODE);
}
return uploadFileToQiniu;
}