Thumbnailator java图片压缩，加水印，批量生成缩略图

地址：http://code.google.com/p/thumbnailator/

1、指定大小进行缩放

//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 收藏代码 //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

//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

//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");

5、水印

//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");

6、裁剪

//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");

7、转化图像格式

//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

//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

//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"));