java图像缩放

图像的缩放，使用Image image = src.getScaledInstance((int)(width * scale), (int)(height * scale), Image.SCALE_DEFAULT);  width,height为原来图片的高和宽，scale为缩放的比率（缩放后/原图）。

 

import java.awt.image.BufferedImage;
import java.awt.Image;
import java.awt.Graphics2D;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.IOException;

public class ImageDone
{
 /**
  * 图像缩放
  * @param srcPath
  * @param targetPath
  * @param scale
  */
 public void zoom(String srcPath, String targetPath, float scale)
 {  
   
        try
        {  
            BufferedImage src = ImageIO.read(new File(srcPath));  // 读入源图像   
            int width = src.getWidth();        // 源图宽  
            int height = src.getHeight();        // 源图高  
                             
            //  获取一个宽、长是原来scale的图像实例  
            Image image = src.getScaledInstance((int)(width * scale), (int)(height * scale), Image.SCALE_DEFAULT); 
           
            //缩放图像
            BufferedImage tag = new BufferedImage((int)(width * scale), (int)(height * scale), BufferedImage.TYPE_INT_RGB);    
            Graphics2D g = tag.createGraphics();  
           
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图  
            g.dispose();  
             
            OutputStream out = new FileOutputStream(targetPath);  
            ImageIO.write(tag, "GIF", out);// 输出
            out.close();  
        }
        catch (IOException e)
        {  
            e.printStackTrace();  
        }
 }
 
 public static void main(String[] args)
 {
  System.out.println("图像缩放--ImageDone");
  new ImageDone().imageZoom("d:\\1.gif", "d:\\1", 0.5f);
 }
}

 

参考：http://xbwolf.javaeye.com/blog/262898