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。


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！
参考地址：http://rensanning.iteye.com/blog/1545708