Java生成缩略图之Thumbnailator
2014-12-12 16:38
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Thumbnailator 是一个为Java界面更流畅的缩略图生成库。从API提供现有的图像文件和图像对象的缩略图中简化了缩略过程,两三行代码就能够从现有图片生成缩略图,且允许微调缩略图生成,同时保持了需要写入到最低限度的代码量。同时还支持根据一个目录批量生成缩略图。
http://code.google.com/p/thumbnailator/
版本:thumbnailator-0.4.2.jar
原图如下:
![](http://dl.iteye.com/upload/attachment/0068/9156/5e19ee98-3217-3c5e-8cd2-fdf613e389eb.jpg)
1、指定大小进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//size(宽度, 高度)
/*
* 若图片横比200小,高比300小,不变
* 若图片横比200小,高比300大,高缩小到300,图片比例不变
* 若图片横比200大,高比300小,横缩小到200,图片比例不变
* 若图片横比200大,高比300大,图片按比例缩小,横为200或高为300
*/
Thumbnails.of("images/a380_1280x1024.jpg")
.size(200, 300)
.toFile("c:/a380_200x300.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(2560, 2048)
.toFile("c:/a380_2560x2048.jpg");
2、按照比例进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//scale(比例)
Thumbnails.of("images/a380_1280x1024.jpg")
.scale(0.25f)
.toFile("c:/a380_25%.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.scale(1.10f)
.toFile("c:/a380_110%.jpg");
3、不按照比例,指定大小进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//keepAspectRatio(false) 默认是按照比例缩放的
Thumbnails.of("images/a380_1280x1024.jpg")
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_200x200.jpg");
4、旋转
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//rotate(角度),正数:顺时针 负数:逆时针
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.rotate(90)
.toFile("c:/a380_rotate+90.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.rotate(-90)
.toFile("c:/a380_rotate-90.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9164/9ed3f07a-8ec9-323b-96fd-4fc7046f9b9f.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9166/76e561b3-f5d5-3cfb-8ef8-60f928249d4a.jpg)
5、水印
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//watermark(位置,水印图,透明度)
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f)
.toFile("c:/a380_watermark_bottom_right.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.watermark(Positions.CENTER, ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f)
.toFile("c:/a380_watermark_center.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9168/01be5a7b-73ad-3f6a-913f-54558037e30b.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9170/1406ca7a-fb25-386f-a669-66320a164562.jpg)
6、裁剪
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//sourceRegion()
//图片中心400*400的区域
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(Positions.CENTER, 400,400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_center.jpg");
//图片右下400*400的区域
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(Positions.BOTTOM_RIGHT, 400,400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_bootom_right.jpg");
//指定坐标
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(600, 500, 400, 400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_coord.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9158/99372a0d-9d1e-3cc4-95e1-4e05121baac8.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9160/abc72ae9-f3f4-34c3-a981-a78927ac4370.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9162/62020296-43c5-3e95-8c4f-f72e2b4710c2.jpg)
7、转化图像格式
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//outputFormat(图像格式)
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.outputFormat("png")
.toFile("c:/a380_1280x1024.png");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.outputFormat("gif")
.toFile("c:/a380_1280x1024.gif");
8、输出到OutputStream
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//toOutputStream(流对象)
OutputStream os = new FileOutputStream("c:/a380_1280x1024_OutputStream.png");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.toOutputStream(os);
9、输出到BufferedImage
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//asBufferedImage() 返回BufferedImage
BufferedImage thumbnail = Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.asBufferedImage();
ImageIO.write(thumbnail, "jpg", new File("c:/a380_1280x1024_BufferedImage.jpg"));
需要注意的是,对于CMYK模式的图像,由于JDK的Bug,目前还不能够处理,会出以下异常:
引用
javax.imageio.IIOException: Unsupported Image Type
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1063)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1034)
at javax.imageio.ImageReader.read(ImageReader.java:940)
at net.coobird.thumbnailator.tasks.io.FileImageSource.read(Unknown Source)
http://code.google.com/p/thumbnailator/
版本:thumbnailator-0.4.2.jar
原图如下:
![](http://dl.iteye.com/upload/attachment/0068/9156/5e19ee98-3217-3c5e-8cd2-fdf613e389eb.jpg)
1、指定大小进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//size(宽度, 高度)
/*
* 若图片横比200小,高比300小,不变
* 若图片横比200小,高比300大,高缩小到300,图片比例不变
* 若图片横比200大,高比300小,横缩小到200,图片比例不变
* 若图片横比200大,高比300大,图片按比例缩小,横为200或高为300
*/
Thumbnails.of("images/a380_1280x1024.jpg")
.size(200, 300)
.toFile("c:/a380_200x300.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(2560, 2048)
.toFile("c:/a380_2560x2048.jpg");
2、按照比例进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//scale(比例)
Thumbnails.of("images/a380_1280x1024.jpg")
.scale(0.25f)
.toFile("c:/a380_25%.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.scale(1.10f)
.toFile("c:/a380_110%.jpg");
3、不按照比例,指定大小进行缩放
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//keepAspectRatio(false) 默认是按照比例缩放的
Thumbnails.of("images/a380_1280x1024.jpg")
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_200x200.jpg");
4、旋转
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//rotate(角度),正数:顺时针 负数:逆时针
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.rotate(90)
.toFile("c:/a380_rotate+90.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.rotate(-90)
.toFile("c:/a380_rotate-90.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9164/9ed3f07a-8ec9-323b-96fd-4fc7046f9b9f.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9166/76e561b3-f5d5-3cfb-8ef8-60f928249d4a.jpg)
5、水印
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//watermark(位置,水印图,透明度)
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f)
.toFile("c:/a380_watermark_bottom_right.jpg");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.watermark(Positions.CENTER, ImageIO.read(new File("images/watermark.png")), 0.5f)
.outputQuality(0.8f)
.toFile("c:/a380_watermark_center.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9168/01be5a7b-73ad-3f6a-913f-54558037e30b.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9170/1406ca7a-fb25-386f-a669-66320a164562.jpg)
6、裁剪
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//sourceRegion()
//图片中心400*400的区域
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(Positions.CENTER, 400,400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_center.jpg");
//图片右下400*400的区域
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(Positions.BOTTOM_RIGHT, 400,400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_bootom_right.jpg");
//指定坐标
Thumbnails.of("images/a380_1280x1024.jpg")
.sourceRegion(600, 500, 400, 400)
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_region_coord.jpg");
![](http://dl.iteye.com/upload/attachment/0068/9158/99372a0d-9d1e-3cc4-95e1-4e05121baac8.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9160/abc72ae9-f3f4-34c3-a981-a78927ac4370.jpg)
![](http://dl.iteye.com/upload/attachment/0068/9162/62020296-43c5-3e95-8c4f-f72e2b4710c2.jpg)
7、转化图像格式
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//outputFormat(图像格式)
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.outputFormat("png")
.toFile("c:/a380_1280x1024.png");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.outputFormat("gif")
.toFile("c:/a380_1280x1024.gif");
8、输出到OutputStream
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//toOutputStream(流对象)
OutputStream os = new FileOutputStream("c:/a380_1280x1024_OutputStream.png");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.toOutputStream(os);
9、输出到BufferedImage
Java代码
![](http://rensanning.iteye.com/images/icon_star.png)
//asBufferedImage() 返回BufferedImage
BufferedImage thumbnail = Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280, 1024)
.asBufferedImage();
ImageIO.write(thumbnail, "jpg", new File("c:/a380_1280x1024_BufferedImage.jpg"));
需要注意的是,对于CMYK模式的图像,由于JDK的Bug,目前还不能够处理,会出以下异常:
引用
javax.imageio.IIOException: Unsupported Image Type
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1063)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1034)
at javax.imageio.ImageReader.read(ImageReader.java:940)
at net.coobird.thumbnailator.tasks.io.FileImageSource.read(Unknown Source)
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