地址:http://code.google.com/p/thumbnailator/
1、指定大小進行縮放
//size(寬度, 高度) /* * 若圖片橫比200小,高比300小,不變 * 若圖片橫比200小,高比300大,高縮小到300,圖片比例不變 * 若圖片橫比200大,高比300小,橫縮小到200,圖片比例不變 * 若圖片橫比200大,高比300大,圖片按比例縮小,橫為200或高為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、按照比例進行縮放
Java代碼 收藏代碼 //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,指定大小進行縮放
//keepAspectRatio(false) 默認是按照比例縮放的 Thumbnails.of("images/a380_1280x1024.jpg") .size(200, 200) .keepAspectRatio(false) .toFile("c:/a380_200x200.jpg")
4、旋轉
//rotate(角度),正數:順時針 負數:逆時針 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,水印圖,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() //圖片中心400*400的區域 Thumbnails.of("images/a380_1280x1024.jpg") .sourceRegion(Positions.CENTER, 400,400) .size(200, 200) .keepAspectRatio(false) .toFile("c:/a380_region_center.jpg"); //圖片右下400*400的區域 Thumbnails.of("images/a380_1280x1024.jpg") .sourceRegion(Positions.BOTTOM_RIGHT, 400,400) .size(200, 200) .keepAspectRatio(false) .toFile("c:/a380_region_bootom_right.jpg"); //指定坐標 Thumbnails.of("images/a380_1280x1024.jpg") .sourceRegion(600, 500, 400, 400) .size(200, 200) .keepAspectRatio(false) .toFile("c:/a380_region_coord.jpg");
7、轉化圖像格式
//outputFormat(圖像格式) 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、輸出到OutputStream
//toOutputStream(流對象) OutputStream os = new FileOutputStream("c:/a380_1280x1024_OutputStream.png"); Thumbnails.of("images/a380_1280x1024.jpg") .size(1280, 1024) .toOutputStream(os);
9、輸出到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"));