Java生成缩略图Thumbnailator_JAVA_编程开发_程序员俱乐部

class="link_title">Java生成缩略图Thumbnailator(转载)

2012-08-14 20:09?454人阅读?评论(0)?收藏?举报 javacapios

转至：http://rensanning.iteye.com/blog/1545708

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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：


1、指定大小进行缩放

Java代码 ?

1. //size(宽度,?高度)??
2. ??
3. /*???
4. ?*?若图片横比200小，高比300小，不变???
5. ?*?若图片横比200小，高比300大，高缩小到300，图片比例不变???
6. ?*?若图片横比200大，高比300小，横缩小到200，图片比例不变???
7. ?*?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???
8. ?*/???
9. Thumbnails.of("images/a380_1280x1024.jpg")???
10. ????????.size(200,?300)??
11. ????????.toFile("c:/a380_200x300.jpg");??
12. ??
13. Thumbnails.of("images/a380_1280x1024.jpg")???
14. ????????.size(2560,?2048)???
15. ????????.toFile("c:/a380_2560x2048.jpg");??

2、按照比例进行缩放

Java代码 ?

1. //scale(比例)??
2. Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.scale(0.25f)??
4. ????????.toFile("c:/a380_25%.jpg");??
5. ??
6. Thumbnails.of("images/a380_1280x1024.jpg")???
7. ????????.scale(1.10f)??
8. ????????.toFile("c:/a380_110%.jpg");??

3、不按照比例，指定大小进行缩放

Java代码 ?

1. //keepAspectRatio(false)?默认是按照比例缩放的??
2. Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.size(200,?200)???
4. ????????.keepAspectRatio(false)???
5. ????????.toFile("c:/a380_200x200.jpg");??

4、旋转

Java代码 ?

1. //rotate(角度),正数：顺时针?负数：逆时针??
2. Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.size(1280,?1024)??
4. ????????.rotate(90)???
5. ????????.toFile("c:/a380_rotate+90.jpg");???
6. ??
7. Thumbnails.of("images/a380_1280x1024.jpg")???
8. ????????.size(1280,?1024)??
9. ????????.rotate(-90)???
10. ????????.toFile("c:/a380_rotate-90.jpg");???

5、水印

Java代码 ?

1. //watermark(位置，水印图，透明度)??
2. Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.size(1280,?1024)??
4. ????????.watermark(Positions.BOTTOM_RIGHT,?ImageIO.read(new?File("images/watermark.png")),?0.5f)???
5. ????????.outputQuality(0.8f)???
6. ????????.toFile("c:/a380_watermark_bottom_right.jpg");??
7. ??
8. Thumbnails.of("images/a380_1280x1024.jpg")???
9. ????????.size(1280,?1024)??
10. ????????.watermark(Positions.CENTER,?ImageIO.read(new?File("images/watermark.png")),?0.5f)???
11. ????????.outputQuality(0.8f)???
12. ????????.toFile("c:/a380_watermark_center.jpg");??

6、裁剪

Java代码 ?

1. //sourceRegion()??
2. ??
3. //图片中心400*400的区域??
4. Thumbnails.of("images/a380_1280x1024.jpg")??
5. ????????.sourceRegion(Positions.CENTER,?400,400)??
6. ????????.size(200,?200)??
7. ????????.keepAspectRatio(false)???
8. ????????.toFile("c:/a380_region_center.jpg");??
9. ??
10. //图片右下400*400的区域??
11. Thumbnails.of("images/a380_1280x1024.jpg")??
12. ????????.sourceRegion(Positions.BOTTOM_RIGHT,?400,400)??
13. ????????.size(200,?200)??
14. ????????.keepAspectRatio(false)???
15. ????????.toFile("c:/a380_region_bootom_right.jpg");??
16. ??
17. //指定坐标??
18. Thumbnails.of("images/a380_1280x1024.jpg")??
19. ????????.sourceRegion(600,?500,?400,?400)??
20. ????????.size(200,?200)??
21. ????????.keepAspectRatio(false)???
22. ????????.toFile("c:/a380_region_coord.jpg");??

7、转化图像格式

Java代码 ?

1. //outputFormat(图像格式)??
2. Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.size(1280,?1024)??
4. ????????.outputFormat("png")???
5. ????????.toFile("c:/a380_1280x1024.png");???
6. ??
7. Thumbnails.of("images/a380_1280x1024.jpg")???
8. ????????.size(1280,?1024)??
9. ????????.outputFormat("gif")???
10. ????????.toFile("c:/a380_1280x1024.gif");???

8、输出到OutputStream

Java代码 ?

1. //toOutputStream(流对象)??
2. OutputStream?os?=?new?FileOutputStream("c:/a380_1280x1024_OutputStream.png");??
3. Thumbnails.of("images/a380_1280x1024.jpg")???
4. ????????.size(1280,?1024)??
5. ????????.toOutputStream(os);??

9、输出到BufferedImage

Java代码 ?

1. //asBufferedImage()?返回BufferedImage??
2. BufferedImage?thumbnail?=?Thumbnails.of("images/a380_1280x1024.jpg")???
3. ????????.size(1280,?1024)??
4. ????????.asBufferedImage();??
5. ImageIO.write(thumbnail,?"jpg",?new?File("c:/a380_1280x1024_BufferedImage.jpg"));???