图片类库 Thumbnails 详解

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

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Thumbnails.of("D:/test.jpg").size(200, 300).toFile("D:/image_200x300.jpg");
Thumbnails.of("D:/test.jpg").size(2560, 2048).toFile("D:/image_1960x2048.jpg");

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scale 图片的压缩比例 值在0-1之间，1f就是原图，0.5就是原图的一半大小
outputQuality 图片压缩的质量 值在0-1 之间，越接近1质量越好，越接近0 质量越差

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Thumbnails.of("D:/test.jpg").scale(0.25f).outputQuality(0.8f).toFile("D:/image_25%.jpg");
Thumbnails.of("D:/test.jpg").scale(0.75f).outputQuality(0.8f).toFile("D:/image_110%.jpg");

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keepAspectRatio(false) 默认是按照比例缩放的

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Thumbnails.of("D:/test.jpg").size(120,120).keepAspectRatio(false).toFile("D:/image_120x120.jpg");

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Thumbnails.of("D:/test.jpg").size(1280, 1024).rotate(90).toFile("D:/image+90.jpg");
Thumbnails.of("D:/test.jpg").size(1280, 1024).rotate(-90).toFile("D:/iamge-90.jpg");

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watermark(位置，水印图，透明度)

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Thumbnails.of("D:/test.jpg").size(1280, 1024).watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("D:/watermark.png")), 0.5f)
.outputQuality(0.8f).toFile("D:/image_watermark_bottom_right.jpg");
Thumbnails.of("D:/test.jpg").size(1280, 1024).watermark(Positions.CENTER, ImageIO.read(new File("D:/watermark.png")), 0.5f)
.outputQuality(0.8f).toFile("D:/image_watermark_center.jpg");

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Thumbnails.of("D:/test.jpg").sourceRegion(Positions.CENTER, 400, 400).size(200, 200).keepAspectRatio(false)
.toFile("D:/image_region_center.jpg");

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Thumbnails.of("D:/test.jpg").size(1280, 1024).outputFormat("png").toFile("D:/image_1280x1024.png");

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OutputStream os = new FileOutputStream("D:/image_region_center.jpg");
Thumbnails.of("D:/test.jpg").size(1280, 1024).toOutputStream(os);

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BufferedImage thumbnail = Thumbnails.of("D:/test.jpg").size(1280, 1024).asBufferedImage();
ImageIO.write(thumbnail, "jpg", new File("D:/image_1280x1024_BufferedImage.jpg"));