Java通过thumbnailator对图片进行缩放，裁剪，添加水印等..

package com.test.image;

import static org.junit.Assert.*;

import java.io.File;

import javax.imageio.ImageIO;

import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;

import org.junit.Test;

public class ImageTest {
	/**
	 * 按照指定大小缩放  按照比例
	 * @throws Exception
	 */
	@Test
	public void testOne() throws Exception {
		//File file = new File("image/1.jpg");
		//System.out.println(file.exists());
		 Thumbnails.of("image/1.jpg").size(200, 300).toFile("image/1_200x300.jpg");
	}
	
	/***
	 * 按照指定比例进行缩放
	 * @throws Exception
	 */
	@Test
	public void testTwo() throws Exception {
		Thumbnails.of("image/1.jpg").scale(0.25f).toFile("image/a_0.25%.jpg");
	}
	
	/***
	 * 根据指定大小进行缩放 不按照比例
	 * @throws Exception
	 */
	@Test
	public void testThree() throws Exception {
		 Thumbnails.of("image/1.jpg").size(200, 300)
		 //设置是否按比例  false  图片可能会走形 默认true
		 .keepAspectRatio(false) 
		 .toFile("image/1_200x300_no.jpg");
	}
	
	/**
	 * 添加水印 （好像只能添加图片水印？）
	 * @throws Exception
	 */
	@Test
	public void testFour() throws Exception {
		Thumbnails.of("image/1.jpg")
		.size(1920, 1080)  //必须要设置大小 不然会抛异常
		.watermark(Positions.BOTTOM_RIGHT,ImageIO.read(new File("image/a_0.25%.jpg")), 0.5f)
		//输出品质   越高 图片越大
		.outputQuality(1.0f)
		.toFile("image/wt.jpg");
	}
	
	/***
	 * 裁剪
	 * @throws Exception
	 */
	@Test
	public void testFive() throws Exception {
		Thumbnails.of("image/1.jpg")
		//从原图哪里开始裁剪   裁减多少
		.sourceRegion(Positions.CENTER, 400, 400)
		//新图的大小
		.size(200, 200).toFile("image/crop.jpg");
		
	}
	
	/**
	 * 改变图片格式
	 * @throws Exception
	 */
	@Test
	public void testSix() throws Exception {
		Thumbnails.of("image/1.jpg")
		.size(1920, 1080)
		.outputFormat("png")
		.toFile("image/1_png.png");
	}
	
	@Test
	public void testName() throws Exception {
		System.out.println(System.getProperty("user.dir"));
	}
}