package main.feng; import javax.imageio.ImageIO; import java.awt.*; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.File; /** * Created by songfeng on 2017/2/16. */ public class ImgUtils { public static void main(String[] args) { try { ImgUtils.zoomImage("D:\\111.jpg", "D:\\222.jpg", 100, 200); ImgUtils.zoomImage("D:\\111.jpg", "D:\\333.jpg", 0.6); } catch (Exception e) { e.printStackTrace(); } } /* * 图片缩放,w,h为缩放的目标宽度和高度 * src为源文件目录,dest为缩放后保存目录 */ 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); //读取图片 Image Itemp = bufImg.getScaledInstance(w, h, bufImg.SCALE_SMOOTH);//设置缩放目标图片模板 wr=w*1.0/bufImg.getWidth(); //获取缩放比例 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); //写入缩减后的图片 } catch (Exception ex) { ex.printStackTrace(); } } /* * 图片按比率缩放 * rate 缩放比率 */ public static void zoomImage(String src,String dest,double rate) throws Exception { File srcFile = new File(src); File destFile = new File(dest); long fileSize = srcFile.length(); if (rate >= 1d) //缩放比例小于1时,才进行缩放 return; BufferedImage bufImg = ImageIO.read(srcFile); Image Itemp = bufImg.getScaledInstance(bufImg.getWidth(), bufImg.getHeight(), bufImg.SCALE_SMOOTH); AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(rate, rate), null); Itemp = ato.filter(bufImg, null); try { ImageIO.write((BufferedImage) Itemp, dest.substring(dest.lastIndexOf(".") + 1), destFile); } catch (Exception ex) { ex.printStackTrace(); } } }
java图片等比例缩放
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转载自songfeng-123.iteye.com/blog/2357599
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