写了一个实用的图像放大缩小程序，但是动画GIF转换后不会显示了，只有第一帧
写了一个实用的图像放大缩小程序，但是动画GIF转换后不会显示了，只有第一帧代码如下，有没做过GIF转换的，提提建议一下，谢谢。
import java.awt.Canvas;import java.awt.Component;import java.awt.Graphics;import java.awt.Image;import java.awt.image.AreaAveragingScaleFilter;import java.awt.image.BufferedImage;import java.awt.image.FilteredImageSource;import java.io.File;import java.util.Arrays;import javax.imageio.ImageIO;import org.apache.log4j.Logger;/** * 一个实用的图像放大缩小程序 ** @author YuLimin */public class ZoomImage{private static final Logger logger = Logger.getLogger(ZoomImage.class);private static Component component = new Canvas();// ".pcx","tga",".tif"这三种格式目前还不支持；// 这些定义的格式经过我测试过是可以支持的。private static String[] imageFormatArray = new String[]{".jpg",".jpeg",".gif",".png",".bmp"};/** * 测试用例 ** @param args * @throws Exception */public static void main(String[] args) throws Exception{ZoomImage zoomImage = new ZoomImage();zoomImage.listFormt();// 缩小四倍zoomImage.zoom("E:/图片/城市风光",0.25,false);// 放大四倍zoomImage.zoom("E:/图片/自然风光",4,false);}/** * 查看图像I/O库所支持的图像格式有哪些格式 */public void listFormt(){String readerMIMETypes[] = ImageIO.getReaderMIMETypes();String writerMIMETypes[] = ImageIO.getWriterMIMETypes();if(logger.isInfoEnabled()){logger.info("ReaderMIMETypes:" + Arrays.asList(readerMIMETypes));logger.info("WriterMIMETypes:" + Arrays.asList(writerMIMETypes));}}/** * 校验图像文件的格式是否可以进行缩放 ** @param fileName * @return */public boolean verifyImageFormat(String fileName){boolean result = false;for(int i = 0;i < imageFormatArray.length;i++){if(fileName.toLowerCase().lastIndexOf(imageFormatArray) == (fileName.length() - imageFormatArray.length())){result = true;break;}}return result;}/** * 将目录下的所有图像进行放大缩小 ** @param strDir 图像的目录 * @param zoomRatio 放大缩小的倍率 * @param rebuild 是否重新创建，即已经存在的图像是否覆盖重建 * @throws Exception */public void zoom(String strDir,double zoomRatio,boolean rebuild) throws Exception{File fileDir = new File(strDir);if(!fileDir.exists()){logger.warn("Not exist:" + strDir);return;}String dirTarget = strDir + "/Zoom" + zoomRatio;File fileTarget = new File(dirTarget);if(!fileTarget.exists()){fileTarget.mkdir();}File[] files = fileDir.listFiles();StringBuilder stringBuilder = new StringBuilder();for(int i = 0;i < files.length;i++){String fileFullName = files.getCanonicalPath();String fileShortName = files.getName();if(!new File(fileFullName).isDirectory())// 排除二级目录，如果想就再递归一次，这里省略{if(verifyImageFormat(fileShortName)){if(logger.isInfoEnabled()){logger.info("Begin Zoom:" + fileFullName);}stringBuilder = new StringBuilder();stringBuilder.append(dirTarget).append("/").append(fileShortName);if(!new File(stringBuilder.toString()).exists() || rebuild){try{createZoomSizeImage(fileFullName,stringBuilder.toString(),zoomRatio);}catch(Exception e){logger.error("createZoomSizeImage Error:" + fileFullName,e);}}if(logger.isInfoEnabled()){logger.info("End Zoom:" + fileFullName);}}else{logger.warn("Can't Zoom:" + fileFullName);}}}}/** * 按比例进行放大缩小图像，zoomRatio = 1为原大，zoomRatio > 1为放大，zoomRatio < 1 为缩小 ** @param fileName * @param fileNameTarget * @param zoomRatio * @throws Exception */public void createZoomSizeImage(String fileName,String fileNameTarget,double zoomRatio) throws Exception{Image image = ImageIO.read(new File(fileName));int width = new Double(image.getWidth(null) * zoomRatio).intValue();int height = new Double(image.getHeight(null) * zoomRatio).intValue();AreaAveragingScaleFilter areaAveragingScaleFilter = new AreaAveragingScaleFilter(width,height);FilteredImageSource filteredImageSource = new FilteredImageSource(image.getSource(),areaAveragingScaleFilter);BufferedImage bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_3BYTE_BGR);Graphics graphics = bufferedImage.createGraphics();graphics.drawImage(component.createImage(filteredImageSource),0,0,null);ImageIO.write(bufferedImage,"JPEG",new File(fileNameTarget));}}
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