本文主要是介绍java中用Thumbnailator对图片各种处理的方法(可做到对原图片压缩仅改变大小),希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
java开发中经常遇到对图片的处理,JDK中也提供了对应的工具类,不过处理起来很麻烦,Thumbnailator是一个优秀的图片处理的开源Java类库,处理效果远比Java API的好,从API提供现有的图像文件和图像对象的类中简化了处理过程,两三行代码就能够从现有图片生成处理后的图片,且允许微调图片的生成方式,同时保持了需要写入的最低限度的代码量。还支持对一个目录的所有图片进行批量处理操作,下边就和大家分享一下java中用Thumbnailator做图片各种处理的方法.
jar自己网上下载一下,maven的话添加依赖即可
<!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
<dependency><groupId>net.coobird</groupId><artifactId>thumbnailator</artifactId><version>0.4.8</version>
</dependency>
import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream;import javax.imageio.ImageIO;import net.coobird.thumbnailator.Thumbnails; import net.coobird.thumbnailator.geometry.Positions;public class ThumbnailatorTest {/*** * @param args* @throws IOException*/public static void main(String[] args) throws IOException {ThumbnailatorTest thumbnailatorTest = new ThumbnailatorTest();thumbnailatorTest.test1();thumbnailatorTest.test2();thumbnailatorTest.test3();thumbnailatorTest.test4();thumbnailatorTest.test5();thumbnailatorTest.test6();thumbnailatorTest.test7();thumbnailatorTest.test8();thumbnailatorTest.test9();}/*** 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"));} }
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