javaBean 自动生成缩略图(原创)

 

package com.GYW.common;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;

import com.GYW.model.NEWSPic;
import java.awt.image.BufferedImage;
import java.io.File;
import java.awt.image.AffineTransformOp;
import java.awt.geom.AffineTransform;


public class ImgCast {
   
   public static void Cast(HttpServletRequest request,NEWSPic pic) {
      try {
          String outPath = request.getRealPath("/")+"castedImgFolder\\";
          String readPath=request.getRealPath("/")+"uploadPic\\";
          File fi = new File(readPath+pic.getPicUrl());   //大图文件
          File fo = new File(outPath+pic.getPicUrl());  //将要转换出的小图文件
          int nw = 145; //根据宽度比例
          AffineTransform transform = new AffineTransform();
          BufferedImage bis = ImageIO.read(fi);
           int w = bis.getWidth();
          int h = bis.getHeight();
          double scale = (double)w/h;
          int nh = (nw*h)/w ;
          double sx = (double)nw/w;
          double sy = (double)nh/h;
          transform.setToScale(sx,sy);
          AffineTransformOp ato = new AffineTransformOp(transform,null);
          BufferedImage bid = new BufferedImage(nw,nh,BufferedImage.TYPE_3BYTE_BGR);
          ato.filter(bis,bid);
          ImageIO.write(bid,"jpeg",fo);
      } catch(Exception e) {
         e.printStackTrace();
      }
   }

}

适用于各J2EE程序，自动生成缩略图，加快网页浏览速度！