java 使用Thumbnailator图片处理包装类

Thumbnailator是一个非常好的图片开源工具，可以很好的完成图片处理。

从API提供现有的图像文件和图像对象的缩略图中简化了缩略过程，两三行代码就能够从现有图片生成缩略图，且允许微调缩略图生成，同时保持了需要写入到最低限度的代码量。同时还支持根据一个目录批量生成缩略图。

Thumbnailator的github地址

文档

Maven中pom.xml 配置：

<dependency>
	<groupId>net.coobird</groupId>
	<artifactId>thumbnailator</artifactId>
	<version>0.4.8</version>
</dependency>

以下是包装类的代码：

package com.sun4j.app.util;
 
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.Position;
 
public class ThumbnailatorUtils {
 
	/** * 指定大小进行缩放 * 若图片横比width小，高比height小，不变 若图片横比width小，高比height大，高缩小到height，图片比例不变 * 若图片横比width大，高比height小，横缩小到width，图片比例不变 * 若图片横比width大，高比height大，图片按比例缩小，横为width或高为height * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 */
	public static void ImgThumb(String source, String output, int width, int height) {
		try {
			Thumbnails.of(source).size(width, height).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 指定大小进行缩放 * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 */
	public static void ImgThumb(File source, String output, int width, int height) {
		try {
			Thumbnails.of(source).size(width, height).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 按照比例进行缩放 * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 */
	public static void ImgScale(String source, String output, double scale) {
		try {
			Thumbnails.of(source).scale(scale).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgScale(File source, String output, double scale) {
		try {
			Thumbnails.of(source).scale(scale).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 不按照比例，指定大小进行缩放 * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 * @param keepAspectRatio * 默认是按照比例缩放的,值为false 时不按比例缩放 */
	public static void ImgNoScale(String source, String output, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgNoScale(File source, String output, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 旋转 ,正数：顺时针 负数：逆时针 * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 * @param rotate * 角度 */
	public static void ImgRotate(String source, String output, int width, int height, double rotate) {
		try {
			Thumbnails.of(source).size(width, height).rotate(rotate).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgRotate(File source, String output, int width, int height, double rotate) {
		try {
			Thumbnails.of(source).size(width, height).rotate(rotate).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 水印 * * @param source * 输入源 * @param output * 输入源 * @param width * 宽 * @param height * 高 * @param position * 水印位置 Positions.BOTTOM_RIGHT o.5f * @param watermark * 水印图片地址 * @param transparency * 透明度 0.5f * @param quality * 图片质量 0.8f */
	public static void ImgWatermark(String source, String output, int width, int height, Position position, String watermark, float transparency, float quality) {
		try {
			Thumbnails.of(source).size(width, height).watermark(position, ImageIO.read(new File(watermark)), transparency).outputQuality(0.8f).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgWatermark(File source, String output, int width, int height, Position position, String watermark, float transparency, float quality) {
		try {
			Thumbnails.of(source).size(width, height).watermark(position, ImageIO.read(new File(watermark)), transparency).outputQuality(0.8f).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 裁剪图片 * * @param source * 输入源 * @param output * 输出源 * @param position * 裁剪位置 * @param x * 裁剪区域x * @param y * 裁剪区域y * @param width * 宽 * @param height * 高 * @param keepAspectRatio * 默认是按照比例缩放的,值为false 时不按比例缩放 */
	public static void ImgSourceRegion(String source, String output, Position position, int x, int y, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).sourceRegion(position, x, y).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgSourceRegion(File source, String output, Position position, int x, int y, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).sourceRegion(position, x, y).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 按坐标裁剪 * * @param source * 输入源 * @param output * 输出源 * @param x * 起始x坐标 * @param y * 起始y坐标 * @param x1 * 结束x坐标 * @param y1 * 结束y坐标 * @param width * 宽 * @param height * 高 * @param keepAspectRatio * 默认是按照比例缩放的,值为false 时不按比例缩放 */
	public static void ImgSourceRegion(String source, String output, int x, int y, int x1, int y1, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).sourceRegion(x, y, x1, y1).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgSourceRegion(File source, String output, int x, int y, int x1, int y1, int width, int height, boolean keepAspectRatio) {
		try {
			Thumbnails.of(source).sourceRegion(x, y, x1, y1).size(width, height).keepAspectRatio(keepAspectRatio).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 转化图像格式 * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 * @param format * 图片类型，gif、png、jpg */
	public static void ImgFormat(String source, String output, int width, int height, String format) {
		try {
			Thumbnails.of(source).size(width, height).outputFormat(format).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void ImgFormat(File source, String output, int width, int height, String format) {
		try {
			Thumbnails.of(source).size(width, height).outputFormat(format).toFile(output);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	/** * 输出到OutputStream * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 * @return toOutputStream(流对象) */
	public static OutputStream ImgOutputStream(String source, String output, int width, int height) {
		OutputStream os = null;
		try {
			os = new FileOutputStream(output);
			Thumbnails.of(source).size(width, height).toOutputStream(os);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return os;
	}
 
	public static OutputStream ImgOutputStream(File source, String output, int width, int height) {
		OutputStream os = null;
		try {
			os = new FileOutputStream(output);
			Thumbnails.of(source).size(width, height).toOutputStream(os);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return os;
	}
 
	/** * 输出到BufferedImage * * @param source * 输入源 * @param output * 输出源 * @param width * 宽 * @param height * 高 * @param format * 图片类型，gif、png、jpg * @return BufferedImage */
	public static BufferedImage ImgBufferedImage(String source, String output, int width, int height, String format) {
		BufferedImage buf = null;
		try {
			buf = Thumbnails.of(source).size(width, height).asBufferedImage();
			ImageIO.write(buf, format, new File(output));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return buf;
	}
 
	public static BufferedImage ImgBufferedImage(File source, String output, int width, int height, String format) {
		BufferedImage buf = null;
		try {
			buf = Thumbnails.of(source).size(width, height).asBufferedImage();
			ImageIO.write(buf, format, new File(output));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return buf;
	}
}

使用此类基本可以完成图片的裁剪、缩略图、水印、图片格式转换、输出流对象等操作！