这篇文章给大家介绍怎么java中使用Thumbnails对图片进行处理,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
Thumbnails支持:
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
输出到ByteArrayOutputStream(OutputStream)
输出到ByteArrayInputStream(InputStream)
输出到byte[]
Thumbnails导入依赖
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
//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,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/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");
File file = new File("c:\\test.png");
Thumbnails.of(new FileInputStream(file)).scale(3.0).toFile(new File("c:\\yyyyy.png"));
3.0是一个double类型的数字,缩放比例,大于1就是变大,小于1就是缩小
//keepAspectRatio(false) 默认是按照比例缩放的
Thumbnails.of("images/a380_1280x1024.jpg")
.size(200, 200)
.keepAspectRatio(false)
.toFile("c:/a380_200x200.jpg");
Thumbnails.of(new File("D:\\pics").listFiles()).scale(0.2).outputFormat("png")
.toFiles(Rename.PREFIX_DOT_THUMBNAIL);
File fromPic = new File("C:\\Users\\Administrator\\Desktop\\IdCardPositive_987136936_1531741954688.jpeg");
File toPic =new File("C:\\Users\\Administrator\\Desktop\\IdCardPositive_987136936_08.jpeg");
Thumbnails.of(fromPic).scale(1f).outputQuality(0.25f).toFile(toPic);
outputQuality就是用来控制图片质量的
Thumbnails.of(fromPic).scale(0.8)
.watermark(Positions.BOTTOM_RIGHT, ImageIO.read(waterPic), 0.5f)
.outputQuality(0.8f).toFile(toPic);
//watermark(位置,水印图,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");
fromPic是原图,waterPic是水印图片,toPic是生成后的图片
Thumbnails.of(fromPic).scale(0.5).rotate(90).toFile(toPic);
Thumbnails.of(fromPic).sourceRegion(Positions.CENTER, 300, 300).scale(1.0).toFile(toPic);
//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");
某些应用上传的图片可能质量比较高,但是用户在列表浏览的时候,又不想原图展示,因为带宽要求较高,此时可以降低图片质量(上面提到的outputQuality),以outputstream输出流的方式response给浏览器去展示
@RequestMapping("/getImages")
public void getImages(HttpServletRequest request, HttpServletResponse response) throws IOException {
Thumbnails.of("images/a380_1280x1024.jpg").
scale(1f).
outputQuality(0.5f).
outputFormat("jpg").toOutputStream(response.getOutputStream());
}
//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");
//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"));
ByteArrayOutputStream thumbnailOutputStream = new ByteArrayOutputStream();
Thumbnails.of("images/a380_1280x1024.jpg").
scale(1f).
outputQuality(0.5f).
outputFormat("jpg").toOutputStream(thumbnailOutputStream);
ByteArrayOutputStream thumbnailOutputStream = new ByteArrayOutputStream();
Thumbnails.of("images/a380_1280x1024.jpg").
scale(1f).
outputQuality(0.5f).
outputFormat("jpg").toOutputStream(thumbnailOutputStream);
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(thumbnailOutputStream.toByteArray());
ByteArrayOutputStream handlerOutputStream = new ByteArrayOutputStream();
Thumbnails.of(inputStream).
scale(1f).
outputQuality(0.25f).
outputFormat("jpg").toOutputStream(handlerOutputStream);
byte[] bytes = handlerOutputStream.toByteArray();
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