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| import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.List;
public class ImageUtil {
public static BufferedImage[] splitImage(BufferedImage image, int rows, int cols) {
int chunks = rows * cols;
int chunkWidth = image.getWidth() / cols;
int chunkHeight = image.getHeight() / rows;
int count = 0;
BufferedImage[] imgs = new BufferedImage[chunks];
for (int x = 0; x < rows; x++) {
for (int y = 0; y < cols; y++) {
imgs[count] = new BufferedImage(chunkWidth, chunkHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D gr = imgs[count].createGraphics();
imgs[count] = gr.getDeviceConfiguration().createCompatibleImage(chunkWidth, chunkHeight, Transparency.TRANSLUCENT);
gr.dispose();
gr = imgs[count].createGraphics();
gr.drawImage(image, 0, 0,
chunkWidth, chunkHeight,
chunkWidth * y, chunkHeight * x,
chunkWidth * y + chunkWidth,
chunkHeight * x + chunkHeight, null);
gr.dispose();
count++;
}
}
return imgs;
}
public static byte[] imageToBytes(BufferedImage bufferedImage) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "png", baos);
baos.flush();
byte[] imageInByte = baos.toByteArray();
baos.close();
return imageInByte;
}
public static byte[] mergeImageBytes(ImageMerge imageMerge, List<byte[]> bytes) {
bytes.removeIf(i -> i == null || i.length == 0);
if (CollectionUtils.isEmpty(bytes)) {
return new byte[0];
}
BufferedImage read = null;
ByteArrayInputStream in = new ByteArrayInputStream(bytes.get(0));
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
read = ImageIO.read(in);
for (int i = 1; i < bytes.size(); i++) {
ByteArrayInputStream in1 = new ByteArrayInputStream(bytes.get(i));
BufferedImage image1 = ImageIO.read(in1);
read = switch (imageMerge) {
case HORIZONTAL -> horizontal(read, image1);
case VERTICAL -> vertical(read, image1);
default -> nested(read, image1);
};
}
ImageIO.write(read, "png", out);
} catch (IOException e) {
LoggerUtil.error("read image byte error,exception:", e);
}
return out.toByteArray();
}
public static byte[] mergeImage(ImageMerge merge, List<String> images) {
byte[] bytes = new byte[0];
try {
BufferedImage image1 = ImageIO.read(new File(images.get(0)));
for (int i = 1; i < images.size(); i++) {
File file = new File(images.get(i));
if (!file.isFile()) {
continue;
}
BufferedImage image2 = ImageIO.read(file);
image1 = switch (merge) {
case HORIZONTAL -> horizontal(image1, image2);
case VERTICAL -> vertical(image1, image2);
default -> nested(image1, image2);
};
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image1, "png", baos);
baos.flush();
return baos.toByteArray();
} catch (IOException e) {
LoggerUtil.error("read image error,exception:", e);
}
return bytes;
}
private static BufferedImage horizontal(BufferedImage image1, BufferedImage image2) {
BufferedImage image = new BufferedImage(image1.getWidth() + image2.getWidth(),
Math.max(image1.getHeight(), image2.getHeight()),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
g.drawImage(image1, 0, 0, null);
g.drawImage(image2, image1.getWidth(), 0, null);
g.dispose();
return image;
}
private static BufferedImage vertical(BufferedImage image1, BufferedImage image2) {
BufferedImage image = new BufferedImage(Math.max(image1.getWidth(), image2.getWidth()),
image1.getHeight() + image2.getHeight(),
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(image1, 0, 0, null);
g.drawImage(image2, 0, image1.getHeight(), null);
g.dispose();
return image;
}
private static BufferedImage nested(BufferedImage image1, BufferedImage image2) {
BufferedImage image = new BufferedImage(Math.max(image1.getWidth(), image2.getWidth()),
Math.max(image1.getHeight(), image2.getHeight()),
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
g.drawImage(image1, 0, 0, null);
g.drawImage(image2, 0, 0, null);
g.dispose();
return image;
}
public static byte[] readImage(String filePath) {
if (StringUtils.isBlank(filePath)) {
return null;
}
try {
BufferedImage read = ImageIO.read(new File(filePath));
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(read, "png", out);
return out.toByteArray();
} catch (IOException e) {
LoggerUtil.error("读取图片失败,exception:", e);
return null;
}
}
public enum ImageMerge {
HORIZONTAL,
VERTICAL,
NESTED
}
}
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