Java图片处理工具类

编程

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"));

 

以上是 Java图片处理工具类 的全部内容, 来源链接: utcz.com/z/510758.html

回到顶部