maven
<dependency>
<groupId>org.imgscalr</groupId>
<artifactId>imgscalr-lib</artifactId>
<version>4.2</version>
</dependency>
resize
##缩放到指定长宽
BufferedImage newImage = Scalr.resize(img,Scalr.Method.SPEED,
targetWidth,targetHeight);
##按比例缩放为长,宽都不超过150的图片
BufferedImage thumbnail = Scalr.resize(image, 150);
rotate
BufferedImage img = ImageIO.read(new File(path));
BufferedImage toImg = Scalr.rotate(img, Scalr.Rotation.CW_90);
crop
BufferedImage img = ImageIO.read(new File(path));
BufferedImage toImg = Scalr.crop(toImg,50,50,400,500);
doc
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