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();
String readerFormatNames[] = ImageIO.getReaderFormatNames();
String writerFormatNames[] = ImageIO.getWriterFormatNames();
if
(
logger
.isInfoEnabled())
{
logger
.info(
"ReaderMIMETypes:"
+ Arrays.asList(readerMIMETypes));
logger
.info(
"WriterMIMETypes:"
+ Arrays.asList(writerMIMETypes));
logger
.info(
"ReaderFormatNames:"
+ Arrays.asList(readerFormatNames));
logger
.info(
"WriterFormatNames:"
+ Arrays.asList(writerFormatNames));
}
}
/**
*
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
[i]) == (fileName.length() -
imageFormatArray
[i].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[i].getCanonicalPath();
String fileShortName = files[i].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));
}
}
