10032---java实现图片裁剪缩放工具类

原文

BufferedImage处理图片及创建图片

package out;    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;    public class ImageHelper {      /*      * 根据尺寸图片居中裁剪      */       public static void cutCenterImage(String src,String dest,int w,int h) throws IOException{            Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");            ImageReader reader = (ImageReader)iterator.next();            InputStream in=new FileInputStream(src);           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);              ImageIO.write(bi, "jpg", new File(dest));                      }      /*      * 图片裁剪二分之一      */       public static void cutHalfImage(String src,String dest) throws IOException{            Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");            ImageReader reader = (ImageReader)iterator.next();            InputStream in=new FileInputStream(src);           ImageInputStream iis = ImageIO.createImageInputStream(in);            reader.setInput(iis, true);            ImageReadParam param = reader.getDefaultReadParam();            int imageIndex = 0;            int width = reader.getWidth(imageIndex)/2;            int height = reader.getHeight(imageIndex)/2;            Rectangle rect = new Rectangle(width/2, height/2, width, height);            param.setSourceRegion(rect);            BufferedImage bi = reader.read(0,param);              ImageIO.write(bi, "jpg", new File(dest));          }      /*      * 图片裁剪通用接口      */        public static void cutImage(String src,String dest,int x,int y,int w,int h) throws IOException{              Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");              ImageReader reader = (ImageReader)iterator.next();              InputStream in=new FileInputStream(src);             ImageInputStream iis = ImageIO.createImageInputStream(in);              reader.setInput(iis, true);              ImageReadParam param = reader.getDefaultReadParam();              Rectangle rect = new Rectangle(x, y, w,h);               param.setSourceRegion(rect);              BufferedImage bi = reader.read(0,param);                ImageIO.write(bi, "jpg", new File(dest));                   }       /*      * 图片缩放      */      public static void zoomImage(String src,String dest,int w,int h) throws Exception {          double wr=0,hr=0;          File srcFile = new File(src);          File destFile = new File(dest);          BufferedImage bufImg = ImageIO.read(srcFile);          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);          } catch (Exception ex) {              ex.printStackTrace();          }                }  }