Java图片处理工具类
Thumbnailator 是一个优秀的图片处理的Google开源Java类库
支持的处理操作:图片缩放,区域裁剪,水印,旋转,保持比例。
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,宽缩小到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,宽为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 按比例缩放
//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 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");
4 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(newFile("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(newFile("images/watermark.png")),0.5f)
.outputQuality(0.8f)
.toFile("c:/a380_watermark_center.jpg");
5 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");
6 图像格式转换
//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");
7 输出
//toOutputStream(流对象) OutputStream os = newFileOutputStream("c:/a380_1280x1024_OutputStream.png");
Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280,1024)
.toOutputStream(os);
//asBufferedImage()返回BufferedImage
BufferedImage thumbnail =Thumbnails.of("images/a380_1280x1024.jpg")
.size(1280,1024)
.asBufferedImage();
ImageIO.write(thumbnail,"jpg",newFile("c:/a380_1280x1024_BufferedImage.jpg"));
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