thumbnailator工具类

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import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;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 ImageUtil {    public static void main(String[] args) throws IOException {        int x = 0;        int y = 0;//左上        int w = 300;        int h = 500;//右下        imgSourceRegion("e:/upload/1508166546722.jpg", "e:/upload/top", x, y, x + w, y + h, 768, 576, true);    }    /**     * 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     * @throws IOException     */    public static void imgThumb(String source, String output, int width, int height, float quality) throws IOException {        Thumbnails.of(source).size(width, height).outputQuality(quality).outputFormat("jpg").toFile(output);    }    /**     * 指定大小进行缩放     *     * @param source 输入源     * @param output 输出源     * @param width  宽     * @param height 高     * @throws IOException     */    public static void imgThumb(File source, String output, int width, int height, float quality) throws IOException {        Thumbnails.of(source).size(width, height).outputQuality(quality).outputFormat("jpg").toFile(output);    }    /**     * 按照比例进行缩放     *     * @param source 输入源     * @param output 输出源     * @throws IOException     */    public static void imgScale(String source, String output, double scale) throws IOException {        Thumbnails.of(source).scale(scale).outputFormat("jpg").toFile(output);    }    public static void imgScale(File source, String output, double scale) throws IOException {        Thumbnails.of(source).scale(scale).outputFormat("jpg").toFile(output);    }    /**     * 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)            throws IOException {        Thumbnails.of(source).size(width, height).keepAspectRatio(keepAspectRatio).outputFormat("jpg").toFile(output);    }    public static void imgNoScale(File source, String output, int width, int height, boolean keepAspectRatio)            throws IOException {        Thumbnails.of(source).size(width, height).keepAspectRatio(keepAspectRatio).outputFormat("jpg").toFile(output);    }    /**     * 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)            throws IOException {        Thumbnails.of(source).size(width, height).rotate(rotate).outputFormat("jpg").toFile(output);    }    public static void imgRotate(File source, String output, int width, int height, double rotate) throws IOException {        Thumbnails.of(source).size(width, height).rotate(rotate).outputFormat("jpg").toFile(output);    }    /**     * 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) throws IOException {        Thumbnails.of(source).size(width, height).watermark(position, ImageIO.read(new File(watermark)), transparency)                .outputQuality(0.8f).outputFormat("jpg").toFile(output);    }    public static void imgWatermark(File source, String output, int width, int height, Position position,                                    String watermark, float transparency, float quality) throws IOException {        Thumbnails.of(source).size(width, height).watermark(position, ImageIO.read(new File(watermark)), transparency)                .outputQuality(0.8f).outputFormat("jpg").toFile(output);    }    /**     * 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) throws IOException {        Thumbnails.of(source).sourceRegion(position, x, y).size(width, height).keepAspectRatio(keepAspectRatio)                .outputFormat("jpg").toFile(output);    }    public static void imgSourceRegion(File source, String output, Position position, int x, int y, int width,                                       int height, boolean keepAspectRatio) throws IOException {        Thumbnails.of(source).sourceRegion(position, x, y).size(width, height).keepAspectRatio(keepAspectRatio)                .outputFormat("jpg").toFile(output);    }    /**     * 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) throws IOException {        Thumbnails.of(source).sourceRegion(x, y, x1, y1).size(width, height).keepAspectRatio(keepAspectRatio)                .toFile(output);    }    public static void imgSourceRegion(File source, String output, int x, int y, int x1, int y1, int width, int height,                                       boolean keepAspectRatio) throws IOException {        Thumbnails.of(source).sourceRegion(x, y, x1, y1).size(width, height).keepAspectRatio(keepAspectRatio)                .outputFormat("jpg").toFile(output);    }    /**     * 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)            throws IOException {        Thumbnails.of(source).size(width, height).outputFormat(format).toFile(output);    }    public static void imgFormat(File source, String output, int width, int height, String format) throws IOException {        Thumbnails.of(source).size(width, height).outputFormat(format).outputFormat("jpg").toFile(output);    }    /**     * 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) throws IOException {        OutputStream os = new FileOutputStream(output);        Thumbnails.of(source).size(width, height).outputFormat("jpg").toOutputStream(os);        return os;    }    public static OutputStream imgOutputStream(File source, String output, int width, int height) throws IOException {        OutputStream os = new FileOutputStream(output);        Thumbnails.of(source).size(width, height).outputFormat("jpg").toOutputStream(os);        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)            throws IOException {        BufferedImage buf = Thumbnails.of(source).size(width, height).outputFormat("jpg").asBufferedImage();        ImageIO.write(buf, format, new File(output));        return buf;    }    public static BufferedImage imgBufferedImage(File source, String output, int width, int height, String format)            throws IOException {        BufferedImage buf = Thumbnails.of(source).size(width, height).outputFormat("jpg").asBufferedImage();        ImageIO.write(buf, format, new File(output));        return buf;    }}

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

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