java使用Thumbnailator操作图片
java使用Thumbnailator操作图片
Thumbnailator 是一个用来生成图像缩略图、裁切、旋转、添加水印等操作的 Java 类库,通过很简单的代码即可生成图片缩略图,也可直接对一整个目录的图片生成缩略图。
Thumbnailator对图片的简单操作代码如下:
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; /** * * @author yaohucaizi * */ 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")); } }
转载:http://www.cnblogs.com/dyllove98/archive/2013/08/02/3233984.html