JAVA生成JPG缩略图

 

import  java.io.File;
       import  java.io.FileOutputStream;
       import  java.awt.Graphics;
       import  java.awt.Image;
       import  java.awt.image.BufferedImage;
       import  com.sun.image.codec.jpeg.JPEGCodec;
       import  com.sun.image.codec.jpeg.JPEGImageEncoder;
      
       public   class  JpgTest  ... {
 
 public void JpgTset() throws Exception...{
     File _file = new File("/Order005-0001.jpg");                       //读入文件
     Image src = javax.imageio.ImageIO.read(_file);                     //构造Image对象
     int wideth=src.getWidth(null);                                     //得到源图宽
     int height=src.getHeight(null);                                    //得到源图长
     BufferedImage tag = new BufferedImage(wideth/2,height/2,BufferedImage.TYPE_INT_RGB);
     tag.getGraphics().drawImage(src,0,0,wideth/2,height/2,null);       //绘制缩小后的图
     FileOutputStream out=new FileOutputStream("newfile.jpg");          //输出到文件流
     JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);       
     encoder.encode(tag);                                               //近JPEG编码
     //System.out.print(width+"*"+height);                              
     out.close();
 }
      }