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@Florida

Hope this helps. It works for both JPG and GIF

yuanzidan(原子弹)
本文发表在 rolia.net 枫下论坛import com.sun.image.codec.jpeg.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.ImageIcon;

public class Thumbnail {
public static void main(String[] args){

if (args.length != 5) {
System.err.println("Usage: java Thumbnail INFILE " + "OUTFILE WIDTH HEIGHT QUALITY");
System.exit(1);
}

try
{
Image image = Toolkit.getDefaultToolkit().getImage(args[0]);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(image, 0);
mediaTracker.waitForID(0);

int thumbWidth = Integer.parseInt(args[2]);
int thumbHeight = Integer.parseInt(args[3]);

double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
thumbHeight = (int)(thumbWidth / imageRatio);
} else {
thumbWidth = (int)(thumbHeight * imageRatio);
}

Image temp = new ImageIcon(image.getScaledInstance( thumbWidth,thumbHeight,Image.SCALE_SMOOTH)).getImage();
BufferedImage thumbImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null), BufferedImage.TYPE_INT_RGB);

Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(new BufferedOutputStream(new FileOutputStream(args[1])));
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
int quality = Integer.parseInt(args[4]);
quality = Math.max(0, Math.min(Integer.parseInt(args[4]), 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
System.out.println("Done.");

}
catch(Exception e)
{System.err.println(e);}
}


}更多精彩文章及讨论，请光临枫下论坛 rolia.net
(#1317207@0)
Last Updated: 2003-8-4
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Replies, comments and Discussions:

  • 工作学习 / IT技术讨论 / 在JAVA中怎样RESIZE一个IMAGE(JPG或GIF格式),哪位有现成的CODE?看API我眼睛都花了 -semaphore(其实你不懂我的心); 2003-8-1 (#1314200@0)
    • 武林高手们,帮帮我呀 -semaphore(其实你不懂我的心); 2003-8-1 (#1314269@0)
      • you can find answers on sun website. http://java.sun.com/products/jfc/tsc/articles/swing2d/index.html -rabin0421(sandrabbit); 2003-8-1 (#1314292@0)
        • 你说的这个是DISPLAY啊,我是想真正的改变图形的大小,比如,宽500PX,我想缩小为300PX -semaphore(其实你不懂我的心); 2003-8-1 (#1314304@0)
          • 如果是要想实际改变大小，我想对图像本身的编码方式要有了解，然后利用Java Image I/O可以实现。对于JPEG类型的图像， -rabin0421(sandrabbit); 2003-8-1 {113} (#1314762@0)
            我知道sun提供了额外的操纵JPEG图像的包 com.sun.image.codec.jpeg（不属于Java基本类库）。但GIF图，不知道有类似的包。
    • <<利用 JSP 代码管理您的图像>> -michaeli(麦粒); 2003-8-1 (#1314293@0)
      • 利用Java 基本API就可以轻松实现。参考我在上面列出的 URL。 -rabin0421(sandrabbit); 2003-8-1 (#1314297@0)
    • Hope this helps. It works for both JPG and GIF -yuanzidan(原子弹); 2003-8-4 {2129} (#1317207@0)
      本文发表在 rolia.net 枫下论坛import com.sun.image.codec.jpeg.*;
      import java.awt.*;
      import java.awt.image.*;
      import java.io.*;
      import javax.swing.ImageIcon;

      public class Thumbnail {
      public static void main(String[] args){

      if (args.length != 5) {
      System.err.println("Usage: java Thumbnail INFILE " + "OUTFILE WIDTH HEIGHT QUALITY");
      System.exit(1);
      }

      try
      {
      Image image = Toolkit.getDefaultToolkit().getImage(args[0]);
      MediaTracker mediaTracker = new MediaTracker(new Container());
      mediaTracker.addImage(image, 0);
      mediaTracker.waitForID(0);

      int thumbWidth = Integer.parseInt(args[2]);
      int thumbHeight = Integer.parseInt(args[3]);

      double thumbRatio = (double)thumbWidth / (double)thumbHeight;
      int imageWidth = image.getWidth(null);
      int imageHeight = image.getHeight(null);
      double imageRatio = (double)imageWidth / (double)imageHeight;
      if (thumbRatio < imageRatio) {
      thumbHeight = (int)(thumbWidth / imageRatio);
      } else {
      thumbWidth = (int)(thumbHeight * imageRatio);
      }

      Image temp = new ImageIcon(image.getScaledInstance( thumbWidth,thumbHeight,Image.SCALE_SMOOTH)).getImage();
      BufferedImage thumbImage = new BufferedImage(temp.getWidth(null), temp.getHeight(null), BufferedImage.TYPE_INT_RGB);

      Graphics2D graphics2D = thumbImage.createGraphics();
      graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
      graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(new BufferedOutputStream(new FileOutputStream(args[1])));
      JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
      int quality = Integer.parseInt(args[4]);
      quality = Math.max(0, Math.min(Integer.parseInt(args[4]), 100));
      param.setQuality((float)quality / 100.0f, false);
      encoder.setJPEGEncodeParam(param);
      encoder.encode(thumbImage);
      System.out.println("Done.");

      }
      catch(Exception e)
      {System.err.println(e);}
      }


      }更多精彩文章及讨论，请光临枫下论坛 rolia.net
      • 哇你太好了,这正是我想要的,开心死了,谢谢哦~~~~~~~~~ -semaphore(其实你不懂我的心); 2003-8-5 (#1318609@0)

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