[转]Java缩略图类带水印（jpg,png）

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package com.example;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.awt.image.ColorModel;import java.awt.image.WritableRaster;import java.io.File;import java.io.FileOutputStream;import javax.imageio.ImageIO;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ImageHelper {        /**         * 生成缩略图 <br/>保存:ImageIO.write(BufferedImage, imgType[jpg/png/...], File);         *          * @param source         *            原图片         * @param width         *            缩略图宽         * @param height         *            缩略图高         * @param b         *            是否等比缩放         * */        public static BufferedImage Thumb(BufferedImage source, int width,                        int height, boolean b) {                // targetW，targetH分别表示目标长和宽                int type = source.getType();                BufferedImage target = null;                double sx = (double) width / source.getWidth();                double sy = (double) height / source.getHeight();                if (b) {                        if (sx > sy) {                                sx = sy;                                width = (int) (sx * source.getWidth());                        } else {                                sy = sx;                                height = (int) (sy * source.getHeight());                        }                }                                if (type == BufferedImage.TYPE_CUSTOM) { // handmade                        ColorModel cm = source.getColorModel();                        WritableRaster raster = cm.createCompatibleWritableRaster(width,                                        height);                        boolean alphaPremultiplied = cm.isAlphaPremultiplied();                        target = new BufferedImage(cm, raster, alphaPremultiplied, null);                } else                        target = new BufferedImage(width, height, type);                Graphics2D g = target.createGraphics();                // smoother than exlax:                g.setRenderingHint(RenderingHints.KEY_RENDERING,                                RenderingHints.VALUE_RENDER_QUALITY);                g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));                g.dispose();                return target;        }        /**         * 图片水印         *          * @param imgPath         *            待处理图片         * @param markPath         *            水印图片         * @param x         *            水印位于图片左上角的 x 坐标值         * @param y         *            水印位于图片左上角的 y 坐标值         * @param alpha         *            水印透明度 0.1f ~ 1.0f         * */        public static void waterMark(String imgPath, String markPath, int x, int y,                        float alpha) {                try {                        // 加载待处理图片文件                        Image img = ImageIO.read(new File(imgPath));                        BufferedImage image = new BufferedImage(img.getWidth(null), img                                        .getHeight(null), BufferedImage.TYPE_INT_RGB);                        Graphics2D g = image.createGraphics();                        g.drawImage(img, 0, 0, null);                        // 加载水印图片文件                        Image src_biao = ImageIO.read(new File(markPath));                        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                                        alpha));                        g.drawImage(src_biao, x, y, null);                        g.dispose();                        // 保存处理后的文件                        FileOutputStream out = new FileOutputStream(imgPath);                        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);                        encoder.encode(image);                        out.close();                } catch (Exception e) {                        e.printStackTrace();                }        }        /**         * 文字水印         *          * @param imgPath         *            待处理图片         * @param text         *            水印文字         * @param font         *            水印字体信息         * @param color         *            水印字体颜色         * @param x         *            水印位于图片左上角的 x 坐标值         * @param y         *            水印位于图片左上角的 y 坐标值         * @param alpha         *            水印透明度 0.1f ~ 1.0f         */        public static void textMark(String imgPath, String text, Font font,                        Color color, int x, int y, float alpha) {                try {                        Font Dfont = (font == null) ? new Font("宋体", 20, 13) : font;                        Image img = ImageIO.read(new File(imgPath));                        BufferedImage image = new BufferedImage(img.getWidth(null), img                                        .getHeight(null), BufferedImage.TYPE_INT_RGB);                        Graphics2D g = image.createGraphics();                        g.drawImage(img, 0, 0, null);                        g.setColor(color);                        g.setFont(Dfont);                        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                                        alpha));                        g.drawString(text, x, y);                        g.dispose();                        FileOutputStream out = new FileOutputStream(imgPath);                        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);                        encoder.encode(image);                        out.close();                } catch (Exception e) {                        System.out.println(e);                }        }}

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