GIF图片转换

http://security.iteye.com/blog/35023




2年前，我提供了一个GIF4J的可用版，GIF4J是一套针对gif操作的Java类库。
周末无聊，最终破解了Gif4J的"Eval Gif4j"。
import  com.gif4j. * ;

import  java.awt. * ;
import  java.awt.image.BufferedImage;
import  java.io.File;
import  java.io.IOException;


public   class  GifImageWatermarkExample {

     //  Usage: java GifImageWatermarkExample [PathToGifImageToWatermark] (please be sure that the gif4j jar is in your CLASSPATH)
     //  By default the gif4j_logotype.gif as an example gif image is used
     public   static   void  main(String[] args) {
        File gifImageFileToWatermark  =   null ;
         if  (args.length  ==   0 ) {
            gifImageFileToWatermark  =   new  File( " test.gif " );
        }  else
            gifImageFileToWatermark  =   new  File(args[ 0 ]);

         //  load and decode gif image
        GifImage gifImage  =   null ;
         try  {
            gifImage  =  GifDecoder.decode(gifImageFileToWatermark);
        }  catch  (IOException e) {
            e.printStackTrace();
            System.exit( 1 );
        }

         //  change out directory if it is necessary
        File outputDir  =   new  File( " . "   +  File.separator  +   " result " );
         if  ( ! outputDir.exists())
            outputDir.mkdirs();

         //  create watermark image using TextPainter
        TextPainter painter  =   new  TextPainter( new  Font( " Verdana " , Font.BOLD,  10 ));
        painter.setOutlinePaint(Color.WHITE);
        BufferedImage watermarkImage  =  painter.renderString( " david.turing " ,  true );

         //  create watermark
        Watermark watermark  =   new  Watermark(watermarkImage, Watermark.LAYOUT_TOP_LEFT,  0.2f );

         //  apply watermark
        GifImage topLeftWatermarked  =  watermark.apply(gifImage,  true );
         //  apply watermark smoothly
        GifImage topLeftWatermarked_smoothly  =  watermark.apply(gifImage,  true );

         //  change the watermark alignment
        watermark.setLayoutConstraint(Watermark.LAYOUT_MIDDLE_CENTER);

         //  apply watermark
        GifImage middleCenterWatermarked  =  watermark.apply(gifImage,  false );
         //  apply watermark smoothly
        GifImage middleCenterWatermarked_smoothly  =  watermark.apply(gifImage,  true );

         //  change the watermark alignment
        watermark.setLayoutConstraint(Watermark.LAYOUT_BOTTOM_RIGHT);

         //  apply watermark
        GifImage bottomRightWatermarked  =  watermark.apply(gifImage,  false );
         //  apply watermark smoothly
        GifImage bottomRightWatermarked_smoothly  =  watermark.apply(gifImage,  true );

         //  change the watermark alignment
        watermark.setLayoutConstraint(Watermark.LAYOUT_COVER_CONSECUTIVELY);
         //  change the watermark transparency
        watermark.setTransparency( 0.20f );

         //  apply watermark
        GifImage coverConsWatermarked  =  watermark.apply(gifImage,  false );
         //  apply watermark smoothly
        GifImage coverConsWatermarked_smoothly  =  watermark.apply(gifImage,  true );

         //  Save the results
         try  {
            GifEncoder.encode(topLeftWatermarked, new  File(outputDir, " topLeftWatermarked.gif " ));
            GifEncoder.encode(topLeftWatermarked_smoothly, new  File(outputDir, " topLeftWatermarked_smooth.gif " ));
            GifEncoder.encode(middleCenterWatermarked, new  File(outputDir, " middleCenterWatermarked.gif " ));
            GifEncoder.encode(middleCenterWatermarked_smoothly, new  File(outputDir, " middleCenterWatermarked_smooth.gif " ));
            GifEncoder.encode(bottomRightWatermarked, new  File(outputDir, " bottomRightWatermarked.gif " ));
            GifEncoder.encode(bottomRightWatermarked_smoothly, new  File(outputDir, " bottomRightWatermarked_smooth.gif " ));
            GifEncoder.encode(coverConsWatermarked, new  File(outputDir, " coverConsWatermarked.gif " ));
            GifEncoder.encode(coverConsWatermarked_smoothly, new  File(outputDir, " coverConsWatermarked_smooth.gif " ));
        }  catch  (IOException e) {
            e.printStackTrace();
        }
    }
}
下面是运行的结果：
topLeftWatermarked.gifmiddleCenterWatermarked.gif
coverConsWatermarked.gifbottomRightWatermarked_smooth.gif

破解的包放在我的UserGroup下载：
http://dev2dev.bea.com.cn/bbs/thread.jspa?forumID=29304&threadID=36395&messageID=214504