ImageCache.java
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package com.bckefu.excel.cache;
import com.bckefu.excel.cache.manager.POICacheManager;
import org.apache.poi.util.IOUtils;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
/**
* @author caoliang1918@aliyun.com
* @Date 2017/11/5:22:50
*/
public class ImageCache {
private static LoadingCache<String, byte[]> loadingCache;
static {
loadingCache = CacheBuilder.newBuilder().expireAfterWrite(1, TimeUnit.DAYS)
.maximumSize(2000).build(new CacheLoader<String, byte[]>() {
@Override
public byte[] load(String imagePath) throws Exception {
InputStream is = POICacheManager.getFile(imagePath);
BufferedImage bufferImg = ImageIO.read(is);
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
try {
ImageIO.write(bufferImg,
imagePath.substring(imagePath.indexOf(".") + 1, imagePath.length()),
byteArrayOut);
return byteArrayOut.toByteArray();
} finally {
IOUtils.closeQuietly(is);
IOUtils.closeQuietly(byteArrayOut);
}
}
});
}
public static byte[] getImage(String imagePath) {
try {
return loadingCache.get(imagePath);
} catch (Exception e) {
return null;
}
}
public static void setLoadingCache(LoadingCache<String, byte[]> loadingCache) {
ImageCache.loadingCache = loadingCache;
}
}