Java 操作按照尺寸裁剪图片

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import org.springframework.stereotype.Component;


/**
 * @author zhanglx
 *
 */
@Component
public class ImgHelper {
	 /**
	  * 根据尺寸图片居中裁剪 
	  * @param in     流
	  * @param dest	     文件存储位置
	  * @param w	     宽
	  * @param h	     高
	  * @param formatname 文件后缀名
	  * @return
	  * @throws IOException
	  */
     public static Boolean cutCenterImage(InputStream in,String dest,int w,int h,String formatname) throws IOException{
    	 
    	 Iterator iterator = ImageIO.getImageReadersByFormatName(formatname);   
    	 ImageReader reader = (ImageReader)iterator.next();
    	 ImageInputStream iis = ImageIO.createImageInputStream(in);
    	 reader.setInput(iis, true);   
         ImageReadParam param = reader.getDefaultReadParam();   
         int imageIndex = 0;   
         Rectangle rect = new Rectangle((reader.getWidth(imageIndex)-w)/2, (reader.getHeight(imageIndex)-h)/2, w, h);    
         param.setSourceRegion(rect);   
         BufferedImage bi = reader.read(0,param);   
         return  ImageIO.write(bi, formatname, new File(dest));     
     }
     /**
      *<p>description：根据尺寸图片居中裁剪 ,返回文件流</p>
      * @author zhanglixin
      * @createtime 2017年1月13日下午2:05:55
      * @param in     流
	  * @param dest	     文件存储位置
	  * @param w	     宽
	  * @param h	     高
	  * @param formatname 文件后缀名
      * @return
      * @throws IOException
      */
     public static InputStream cutCenterImageStream(InputStream in,String dest,int w,int h,String formatname)throws IOException{
    	 if(cutCenterImage(in, dest, w, h, formatname)){
    		 File imagefile=new File(dest);;
    		 InputStream ins = new FileInputStream(imagefile);
    		 return ins;
    	 }
         return null;
     }
     
     /**
      * 根据图片规定尺寸缩放
      * @param in		文件流
      * @param dest		存储位置
      * @param w		宽
      * @param h		高
      * @return
      * @throws Exception
      */
     public static Boolean zoomImage(InputStream in,String dest,int w,int h) throws Exception{
    	 
    	 double wr=0,hr=0;  
         File destFile = new File(dest);  
         BufferedImage bufImg = ImageIO.read(in);
         Image Itemp = bufImg.getScaledInstance(w, h, bufImg.SCALE_SMOOTH);  
         wr=w*1.0/bufImg.getWidth();  
         hr=h*1.0 / bufImg.getHeight();  
         AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(wr, hr), null);  
         Itemp = ato.filter(bufImg, null);  
         try {  
             ImageIO.write((BufferedImage) Itemp,dest.substring(dest.lastIndexOf(".")+1), destFile);  
             return true;
         } catch (Exception ex) {  
             ex.printStackTrace();
             return false;
         }  
     }
}