org.jeecgframework.poi.cache.ImageCache Maven / Gradle / Ivy
/**
* Copyright 2013-2015 JueYue ([email protected])
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jeecgframework.poi.cache;
import org.apache.poi.util.IOUtils;
import org.jeecgframework.poi.cache.manager.POICacheManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
/**
* 图片缓存处理
*
* @author liusq
* 2022-05-27 下午4:16:32
*/
public class ImageCache {
private static final Logger LOGGER = LoggerFactory
.getLogger(ImageCache.class);
public static byte[] getImage(String imagePath) {
InputStream is = POICacheManager.getFile(imagePath);
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
final ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
try {
int ch;
while ((ch = is.read()) != -1) {
swapStream.write(ch);
}
Image image = Toolkit.getDefaultToolkit().createImage(swapStream.toByteArray());
BufferedImage bufferImg = toBufferedImage(image);
ImageIO.write(bufferImg,
imagePath.substring(imagePath.lastIndexOf(".") + 1, imagePath.length()),
byteArrayOut);
return byteArrayOut.toByteArray();
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
return null;
} finally {
IOUtils.closeQuietly(is);
IOUtils.closeQuietly(swapStream);
IOUtils.closeQuietly(byteArrayOut);
}
}
public static BufferedImage toBufferedImage(Image image) {
if (image instanceof BufferedImage) {
return (BufferedImage) image;
}
// This code ensures that all the pixels in the image are loaded
image = new ImageIcon(image).getImage();
BufferedImage bimage = null;
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
try {
int transparency = Transparency.OPAQUE;
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(image.getWidth(null),
image.getHeight(null), transparency);
} catch (HeadlessException e) {
// The system does not have a screen
}
if (bimage == null) {
// Create a buffered image using the default color model
int type = BufferedImage.TYPE_INT_RGB;
bimage = new BufferedImage(image.getWidth(null),
image.getHeight(null), type);
}
// Copy image to buffered image
Graphics g = bimage.createGraphics();
// Paint the image onto the buffered image
g.drawImage(image, 0, 0, null);
g.dispose();
return bimage;
}
}