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• 指定大小进行缩放
• 按照比例进行缩放
• 不按照比例，指定大小进行缩放
• 旋转
• 水印
• 裁剪
• 转化图像格式
• 输出到OutputStream
• 输出到BufferedImage

使用步骤

1. 导入架包

<dependency><groupId>net.coobird</groupId><artifactId>thumbnailator</artifactId><version>0.4.8</version></dependency>

2.具体使用方法

/*** 指定大小进行缩放* * @throws IOException*/private void test1() throws IOException {/** size(width,height) 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/test.jpg").size(200, 300).toFile("C:/image_200x300.jpg");Thumbnails.of("images/test.jpg").size(2560, 2048).toFile("C:/image_2560x2048.jpg");}/*** 按照比例进行缩放* * @throws IOException*/private void test2() throws IOException {/*** scale(比例)*/Thumbnails.of("images/test.jpg").scale(0.25f).toFile("C:/image_25%.jpg");Thumbnails.of("images/test.jpg").scale(1.10f).toFile("C:/image_110%.jpg");}/*** 不按照比例，指定大小进行缩放* * @throws IOException*/private void test3() throws IOException {/*** keepAspectRatio(false) 默认是按照比例缩放的*/Thumbnails.of("images/test.jpg").size(120, 120).keepAspectRatio(false).toFile("C:/image_120x120.jpg");}/*** 旋转* * @throws IOException*/private void test4() throws IOException {/*** rotate(角度),正数：顺时针 负数：逆时针*/Thumbnails.of("images/test.jpg").size(1280, 1024).rotate(90).toFile("C:/image+90.jpg");Thumbnails.of("images/test.jpg").size(1280, 1024).rotate(-90).toFile("C:/iamge-90.jpg");}/*** 水印* * @throws IOException*/private void test5() throws IOException {/*** watermark(位置，水印图，透明度)*/Thumbnails.of("images/test.jpg").size(1280, 1024).watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("images/watermark.png")), 0.5f).outputQuality(0.8f).toFile("C:/image_watermark_bottom_right.jpg");Thumbnails.of("images/test.jpg").size(1280, 1024).watermark(Positions.CENTER, ImageIO.read(new File("images/watermark.png")), 0.5f).outputQuality(0.8f).toFile("C:/image_watermark_center.jpg");}/*** 裁剪* * @throws IOException*/private void test6() throws IOException {/*** 图片中心400*400的区域*/Thumbnails.of("images/test.jpg").sourceRegion(Positions.CENTER, 400, 400).size(200, 200).keepAspectRatio(false).toFile("C:/image_region_center.jpg");/*** 图片右下400*400的区域*/Thumbnails.of("images/test.jpg").sourceRegion(Positions.BOTTOM_RIGHT, 400, 400).size(200, 200).keepAspectRatio(false).toFile("C:/image_region_bootom_right.jpg");/*** 指定坐标*/Thumbnails.of("images/test.jpg").sourceRegion(600, 500, 400, 400).size(200, 200).keepAspectRatio(false).toFile("C:/image_region_coord.jpg");}/*** 转化图像格式* * @throws IOException*/private void test7() throws IOException {/*** outputFormat(图像格式)*/Thumbnails.of("images/test.jpg").size(1280, 1024).outputFormat("png").toFile("C:/image_1280x1024.png");Thumbnails.of("images/test.jpg").size(1280, 1024).outputFormat("gif").toFile("C:/image_1280x1024.gif");}/*** 输出到OutputStream* * @throws IOException*/private void test8() throws IOException {/*** toOutputStream(流对象)*/OutputStream os = new FileOutputStream("C:/image_1280x1024_OutputStream.png");Thumbnails.of("images/test.jpg").size(1280, 1024).toOutputStream(os);}/*** 输出到BufferedImage* * @throws IOException*/private void test9() throws IOException {/*** asBufferedImage() 返回BufferedImage*/BufferedImage thumbnail = Thumbnails.of("images/test.jpg").size(1280, 1024).asBufferedImage();ImageIO.write(thumbnail, "jpg", new File("C:/image_1280x1024_BufferedImage.jpg"));}