制作图片缩略图的Groovy脚本
2009-09-22 00:00:00 来源:WEB开发网import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
import java.awt.image.BufferedImage;
import java.awt.*;
def createThumbnail(File input, File output, int length) throws IOException {
if (!input.exists()) {
throw new RuntimeException("input file not exists!");
}
if (!output.exists()) {
output.createNewFile();
}
BufferedImage srcImage = ImageIO.read(input);
int realWidth = srcImage.getWidth(null);
int realHeight = srcImage.getHeight(null);
int width, height;
if (realWidth < length && realHeight < length) {
// 保持原来大小
width = realWidth;
height = realHeight;
} else if ((length * realHeight) / realWidth > length) {
// 按照实际高度来压缩
// 压缩后的宽
width = (length * realWidth) / realHeight;
// 压缩后的高度
height = length;
} else {
// 按实际宽度来压缩
// 压缩后的宽
width = length;
// 压缩后的高度
height = (length * realHeight) / realWidth;
}
Image newImage = srcImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage targetImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = targetImage.getGraphics();
g.drawImage(newImage, 0, 0, null); // 绘制缩小后的图
g.dispose();
ImageIO.write(targetImage, "jpeg", output);
}
def dir = new File("d:/var/wormser/sample")
dir.eachFile{ f->
def name = f.name;
println name
newFileName = name.replaceAll(/^([a-zA-Z0-9_]+)\.([a-zA-Z0-9]+)$/, "\$1_tb.jpg")
def newFile = new File(dir.getAbsolutePath() + File.separator + newFileName)
println newFileName
createThumbnail(f, newFile, 160)
}
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