Java按照给定大小自动裁剪图片

<!-- 缩略图依赖 -->
		<dependency>
			<groupId>net.coobird</groupId>
			<artifactId>thumbnailator</artifactId>
			<version>0.4.8</version>
		</dependency>

package s.jf3q.com.untils;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.imageio.ImageIO;



import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;
import s.jf3q.com.cons.Sys;

public class ThumbnailUntils {


	    public static String crateImg(String fn ,Integer width,Integer height) throws IOException {
	        File _file = new File(Sys.Upimg.absolute_path+fn); // 读入文件

	         if(!_file.exists()){
	        	  return null;
	         }



	    	// 图片对象
	         BufferedImage bufferedImage = ImageIO.read(new FileInputStream(Sys.Upimg.absolute_path+fn));
	         // 宽度
	         int imgwidth = bufferedImage.getWidth();
	         // 高度
			int  imgheight = bufferedImage.getHeight();
			System.out.println("原图："+imgwidth+","+imgheight);
			System.out.println("设置大小："+width+","+height);

 			if(width==height ){
				if(imgwidth>imgheight)imgwidth=imgheight;
				else imgheight=imgwidth;
				Thumbnails.of(Sys.Upimg.absolute_path+fn)
						.sourceRegion(Positions.CENTER,imgwidth,imgheight)
						.size(width, height).outputQuality(1f)
						.toFile(Sys.Upimg.absolute_path+fn);
				System.out.println("比例之后："+imgwidth+","+imgheight);
			} else {
				if(imgwidth>imgheight)imgwidth=imgheight*width/height;
				else imgheight=imgwidth*height/width;
				Thumbnails.of(Sys.Upimg.absolute_path+fn)
						.sourceRegion(Positions.CENTER,imgwidth,imgheight)
						.size(width, height).outputQuality(1f)
						.toFile(Sys.Upimg.absolute_path+fn);
				System.out.println("比例之后："+imgwidth+","+imgheight);
			}






	         return   fn;
	    }


}