工具類的功能：縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖片水印等

package net.kitbox.util;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.RenderingHints;import java.awt.Toolkit;import java.awt.color.ColorSpace;import java.awt.image.BufferedImage;import java.awt.image.ColorConvertOp;import java.awt.image.CropImageFilter;import java.awt.image.FilteredImageSource;import java.awt.image.ImageFilter;import java.awt.image.ImagingOpException;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import javax.imageio.ImageIO;/** * author:lldy * time:2012-5-6下午6:37:18 * 圖片處理工具類：<br> * 功能：縮放圖像、切割圖像、圖像類型轉換、彩色轉黑白、文字水印、圖片水印等 */public class ImageUtils {    /**     * 相對于圖片的位置     */    PRivate static final int POSITION_UPPERLEFT=0;    private static final int POSITION_UPPERRIGHT=10;    private static final int POSITION_LOWERLEFT=1;    private static final int POSITION_LOWERRIGHT=11;    /**     * 幾種常見的圖片格式     */    public static String IMAGE_TYPE_GIF = "gif";// 圖形交換格式    public static String IMAGE_TYPE_JPG = "jpg";// 聯合照片專家組    public static String IMAGE_TYPE_JPEG = "jpeg";// 聯合照片專家組    public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap（位圖）的簡寫，它是Windows操作系統中的標準圖像文件格式    public static String IMAGE_TYPE_PNG = "png";// 可移植網絡圖形    private static ImageUtils instance;    private ImageUtils() {        instance = this;    }    /**     * 獲取實例     * @return     */    public static ImageUtils getInstance() {        if (instance == null) {            instance = new ImageUtils();        }        return instance;    }    public  BufferedImage image2BufferedImage(Image image){        System.out.println(image.getWidth(null));        System.out.println(image.getHeight(null));        BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);        Graphics2D g = bufferedImage.createGraphics();        g.drawImage(image, null, null);        g.dispose();        System.out.println(bufferedImage.getWidth());        System.out.println(bufferedImage.getHeight());        return bufferedImage;    }    /**     * 縮放并轉換格式后保存     * @param srcPath源路徑     * @param destPath目標路徑     * @param width：目標寬     * @param height：目標高     * @param format：文件格式     * @return     */    public static boolean scaleToFile(String srcPath, String destPath, int width,  int height,String format) {        boolean flag = false;        try {            File file = new File(srcPath);            File destFile = new File(destPath);            if (!destFile.getParentFile().exists()) {                destFile.getParentFile().mkdir();            }            BufferedImage src = ImageIO.read(file); // 讀入文件            Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);            Graphics g = tag.getGraphics();            g.drawImage(image, 0, 0, null); // 繪制縮小后的圖            g.dispose();            flag = ImageIO.write(tag, format, new FileOutputStream(destFile));// 輸出到文件流        } catch (IOException e) {            e.printStackTrace();        }        return flag;    }    /**     * 縮放Image，此方法返回源圖像按百分比縮放后的圖像     * @param inputImage     * @param percentage 百分比 允許的輸入0<percentage<10000     * @return     */    public static BufferedImage scaleByPercentage(BufferedImage inputImage,int percentage){        //允許百分比        if(0>percentage||percentage>10000){            throw new ImagingOpException("Error::不合法的參數:percentage->"+percentage+",percentage應該大于0~小于10000");        }               //獲取原始圖像透明度類型        int type = inputImage.getColorModel().getTransparency();        //獲取目標圖像大小        int w=inputImage.getWidth()*percentage;        int h=inputImage.getHeight()*percentage;         //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_INTERPOLATION,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_RENDER_QUALITY);        BufferedImage img = new BufferedImage(w, h, type);        Graphics2D graphics2d =img.createGraphics();        graphics2d.setRenderingHints(renderingHints);                graphics2d.drawImage(inputImage, 0, 0, w, h, 0, 0, inputImage                .getWidth(), inputImage.getHeight(), null);        graphics2d.dispose();        return img;        /*此代碼將返回Image類型        return inputImage.getScaledInstance(inputImage.getWidth()*percentage,                inputImage.getHeight()*percentage, Image.SCALE_SMOOTH);        */    }    /**     * 縮放Image，此方法返回源圖像按給定最大寬度限制下按比例縮放后的圖像     * @param inputImage     * @param maxWidth：壓縮后允許的最大寬度     * @param maxHeight：壓縮后允許的最大高度     * @throws java.io.IOException     * return      */    public static BufferedImage scaleByPixelRate(BufferedImage inputImage, int maxWidth, int maxHeight) throws Exception {        //獲取原始圖像透明度類型        int type = inputImage.getColorModel().getTransparency();        int width = inputImage.getWidth();        int height = inputImage.getHeight();        int newWidth = maxWidth;        int newHeight =maxHeight;        //如果指定最大寬度超過比例        if(width*maxHeight<height*maxWidth){            newWidth=(int)(newHeight*width/height) ;        }        //如果指定最大高度超過比例        if(width*maxHeight>height*maxWidth){            newHeight=(int)(newWidth*height/width);        }        //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_INTERPOLATION,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_RENDER_QUALITY);        BufferedImage img = new BufferedImage(newWidth, newHeight, type);        Graphics2D graphics2d =img.createGraphics();        graphics2d.setRenderingHints(renderingHints);                graphics2d.drawImage(inputImage, 0, 0, newWidth, newHeight, 0, 0, width, height, null);        graphics2d.dispose();        return img;    }    /**     * 縮放Image，此方法返回源圖像按給定寬度、高度限制下縮放后的圖像     * @param inputImage     * @param maxWidth：壓縮后寬度     * @param maxHeight：壓縮后高度     * @throws java.io.IOException     * return      */    public static BufferedImage scaleByPixel(BufferedImage inputImage, int newWidth, int newHeight) throws Exception {        //獲取原始圖像透明度類型        int type = inputImage.getColorModel().getTransparency();        int width = inputImage.getWidth();        int height = inputImage.getHeight();        //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_ANTIALIASING,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);        BufferedImage img = new BufferedImage(newWidth, newHeight, type);        Graphics2D graphics2d =img.createGraphics();        graphics2d.setRenderingHints(renderingHints);                graphics2d.drawImage(inputImage, 0, 0, newWidth, newHeight, 0, 0, width, height, null);        graphics2d.dispose();        return img;    }    /**     * 切割圖像，返回指定范圍的圖像     * @param inputImage     * @param x 起點橫坐標     * @param y 起點縱坐標     * @param width 切割圖片寬度:如果寬度超出圖片，將改為圖片自x剩余寬度     * @param height 切割圖片高度：如果高度超出圖片，將改為圖片自y剩余高度     * @param fill 指定目標圖像大小超出時是否補白，如果true，則表示補白；false表示不補白，此時將重置目標圖像大小     * @return     */    public static BufferedImage cut(BufferedImage inputImage,int x,int y,int width,int height,boolean fill){        //獲取原始圖像透明度類型        int type = inputImage.getColorModel().getTransparency();        int w = inputImage.getWidth();        int h = inputImage.getHeight();        int endx=x+width;        int endy=y+height;        if(x>w)            throw new ImagingOpException("起點橫坐標超出源圖像范圍");        if(y>h)            throw new ImagingOpException("起點縱坐標超出源圖像范圍");        BufferedImage img;        //補白        if(fill){            img = new BufferedImage(width, height, type);            //寬度超出限制            if((w-x)<width){                width=w-x;                endx=w;            }            //高度超出限制            if((h-y)<height){                height=h-y;                endy=h;            }        //不補        }else{            //寬度超出限制            if((w-x)<width){                width=w-x;                endx=w;            }            //高度超出限制            if((h-y)<height){                height=h-y;                endy=h;            }            img = new BufferedImage(width, height, type);          }        //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_INTERPOLATION,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_RENDER_QUALITY);        Graphics2D graphics2d =img.createGraphics();        graphics2d.setRenderingHints(renderingHints);                graphics2d.drawImage(inputImage, 0, 0, width, height, x, y, endx, endy, null);        graphics2d.dispose();        return img;    }    /**     * 切割圖像，返回指定起點位置指定大小圖像     * @param inputImage     * @param startPoint 起點位置：左上：0、右上:10、左下:1、右下:11     * @param width 切割圖片寬度     * @param height 切割圖片高度     * @param fill 指定目標圖像大小超出時是否補白，如果true，則表示補白；false表示不補白，此時將重置目標圖像大小     * @return     */    public static BufferedImage cut(BufferedImage inputImage,int startPoint,int width,int height,boolean fill){        //獲取原始圖像透明度類型        int type = inputImage.getColorModel().getTransparency();        int w = inputImage.getWidth();        int h = inputImage.getHeight();        BufferedImage img;        //補白        if(fill){            img = new BufferedImage(width, height, type);            if(width>w)                width=w;            if(height>h)                height=h;        //不補        }else{            if(width>w)                width=w;            if(height>h)                height=h;            img = new BufferedImage(width, height, type);        }        //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_INTERPOLATION,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_RENDER_QUALITY);               Graphics2D graphics2d =img.createGraphics();        graphics2d.setRenderingHints(renderingHints);         switch(startPoint){                //右上            case POSITION_UPPERRIGHT:                graphics2d.drawImage(inputImage, w-width, 0, w, height, 0, 0, width, height, null);                break;                //左下            case POSITION_LOWERLEFT:                graphics2d.drawImage(inputImage, 0, h-height, width, h, 0, 0, width, height, null);                   break;                //右下            case POSITION_LOWERRIGHT:                graphics2d.drawImage(inputImage, w-width, h-height, w, h, 0, 0, width, height, null);                 break;                //默認左上            case POSITION_UPPERLEFT:            default:                 graphics2d.drawImage(inputImage, 0, 0, width, height, 0, 0, width, height, null);        }        graphics2d.dispose();        return img;    }    /**     * 以指定角度旋轉圖片：使用正角度 theta 進行旋轉，可將正 x 軸上的點轉向正 y 軸。      * @param inputImage     * @param degree 角度:以度數為單位     * @return     */    public static BufferedImage rotateImage(final BufferedImage inputImage,            final int degree) {        int w = inputImage.getWidth();        int h = inputImage.getHeight();        int type = inputImage.getColorModel().getTransparency();        BufferedImage img=new BufferedImage(w, h, type);        Graphics2D graphics2d =img.createGraphics();        //開啟抗鋸齒        RenderingHints renderingHints=new RenderingHints(RenderingHints.KEY_INTERPOLATION,                RenderingHints.VALUE_ANTIALIAS_ON);        //使用高質量壓縮        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_RENDER_QUALITY);        graphics2d.setRenderingHints(renderingHints);        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);        graphics2d.drawImage(inputImage, 0, 0, null);        graphics2d.dispose();        return img;    }    /**     * 水平翻轉圖像     *      * @param bufferedimage 目標圖像     * @return     */    public static BufferedImage flipHorizontalImage(final BufferedImage inputImage) {        int w = inputImage.getWidth();        int h = inputImage.getHeight();        BufferedImage img;        Graphics2D graphics2d;        (graphics2d = (img = new BufferedImage(w, h, inputImage                .getColorModel().getTransparency())).createGraphics())                .drawImage(inputImage, 0, 0, w, h, w, 0, 0, h, null);        graphics2d.dispose();        return img;    }    /**     * 豎直翻轉圖像     *      * @param bufferedimage 目標圖像     * @return     */    public static BufferedImage flipVerticalImage(final BufferedImage inputImage) {        int w = inputImage.getWidth();        int h = inputImage.getHeight();        BufferedImage img;        Graphics2D graphics2d;        (graphics2d = (img = new BufferedImage(w, h, inputImage                .getColorModel().getTransparency())).createGraphics())                .drawImage(inputImage, 0, 0, w, h, 0, h, w, 0, null);        graphics2d.dispose();        return img;    }       /**     * 圖片水印     *      * @param inputImage     *            待處理圖像     * @param markImage     *            水印圖像     * @param x     *            水印位于圖片左上角的 x 坐標值     * @param y     *            水印位于圖片左上角的 y 坐標值     * @param alpha     *            水印透明度 0.1f ~ 1.0f     * */    public static BufferedImage waterMark(BufferedImage inputImage,BufferedImage markImage, int x, int y,                    float alpha) {            BufferedImage image = new BufferedImage(inputImage.getWidth(), inputImage                            .getHeight(), BufferedImage.TYPE_INT_ARGB);            Graphics2D g = image.createGraphics();            g.drawImage(inputImage, 0, 0, null);            // 加載水印圖像            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                            alpha));            g.drawImage(markImage, x, y, null);            g.dispose();            return image;    }    /**     * 文字水印     *      * @param inputImage     *            待處理圖像     * @param text     *            水印文字     * @param font     *            水印字體信息     * @param color     *            水印字體顏色     * @param x     *            水印位于圖片左上角的 x 坐標值     * @param y     *            水印位于圖片左上角的 y 坐標值     * @param alpha     *            水印透明度 0.1f ~ 1.0f     */    public static BufferedImage textMark(BufferedImage inputImage, String text, Font font,                    Color color, int x, int y, float alpha) {            Font dfont = (font == null) ? new Font("宋體", 20, 13) : font;            BufferedImage image = new BufferedImage(inputImage.getWidth(), inputImage                            .getHeight(), BufferedImage.TYPE_INT_ARGB);            Graphics2D g = image.createGraphics();            g.drawImage(inputImage, 0, 0, null);            g.setColor(color);            g.setFont(dfont);            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                            alpha));            g.drawString(text, x, y);            g.dispose();            return image;    }      /**     * 圖像彩色轉黑白色     * @param inputImage     * @return 轉換后的BufferedImage     */    public final static BufferedImage toGray(BufferedImage inputImage)    {            ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);            //對源 BufferedImage 進行顏色轉換。如果目標圖像為 null，            //則根據適當的 ColorModel 創建 BufferedImage。             ColorConvertOp op = new ColorConvertOp(cs, null);            return op.filter(inputImage, null);    }    /**     * 圖像彩色轉為黑白     * @param srcImageFile     *            源圖像地址     * @param destImageFile     *            目標圖像地址     * @param formatType     *              目標圖像格式：如果formatType為null;將默認轉換為PNG     */    public final static void toGray(String srcImageFile, String destImageFile,String formatType)    {        try        {            BufferedImage src = ImageIO.read(new File(srcImageFile));            ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);            ColorConvertOp op = new ColorConvertOp(cs, null);            src = op.filter(src, null);            //如果formatType為null;將默認轉換為PNG            if(formatType==null){                formatType="PNG";            }            ImageIO.write(src,formatType,new File(destImageFile));        } catch (IOException e)        {            e.printStackTrace();        }    }    /**     * 圖像類型轉換：GIF->JPG、GIF->PNG、PNG->JPG、PNG->GIF(X)、BMP->PNG     *      * @param inputImage     *            源圖像地址     * @param formatType     *            包含格式非正式名稱的 String：如JPG、JPEG、GIF等     * @param destImageFile     *            目標圖像地址     */    public final static void convert(BufferedImage inputImage, String formatType,String destImageFile)    {        try        {            ImageIO.write(inputImage, formatType, new File(destImageFile));        } catch (Exception e)        {            e.printStackTrace();        }    }    /**     * 圖像切割（指定切片的行數和列數）     *      * @param srcImageFile     *            源圖像地址     * @param destDir     *            切片目標文件夾     * @param formatType     *              目標格式     * @param rows     *            目標切片行數。默認2，必須是范圍 [1, 20] 之內     * @param cols     *            目標切片列數。默認2，必須是范圍 [1, 20] 之內     */    public final static void cut(BufferedImage inputImage, String destDir,            String formatType,int rows, int cols)    {        try        {            if (rows <= 0 || rows > 20)                rows = 2; // 切片行數            if (cols <= 0 || cols > 20)                cols = 2; // 切片列數            // 讀取源圖像            //BufferedImage bi = ImageIO.read(new File(srcImageFile));            int w = inputImage.getHeight(); // 源圖寬度            int h = inputImage.getWidth(); // 源圖高度            if (w > 0 && h > 0)            {                Image img;                ImageFilter cropFilter;                Image image = inputImage.getScaledInstance(w, h,                        Image.SCALE_DEFAULT);                int destWidth = w; // 每張切片的寬度                int destHeight = h; // 每張切片的高度                // 計算切片的寬度和高度                if (w % cols == 0)                {                    destWidth = w / cols;                } else                {                    destWidth = (int) Math.floor(w / cols) + 1;                }                if (h % rows == 0)                {                    destHeight = h / rows;                } else                {                    destHeight = (int) Math.floor(h / rows) + 1;                }                // 循環建立切片                // 改進的想法:是否可用多線程加快切割速度                for (int i = 0; i < rows; i++)                {                    for (int j = 0; j < cols; j++)                    {                        // 四個參數分別為圖像起點坐標和寬高                        // 即: CropImageFilter(int x,int y,int width,int height)                        cropFilter = new CropImageFilter(j * destWidth, i                                * destHeight, destWidth, destHeight);                        img = Toolkit.getDefaultToolkit().createImage(                                new FilteredImageSource(image.getSource(),                                        cropFilter));                        BufferedImage tag = new BufferedImage(destWidth,                                destHeight, BufferedImage.TYPE_INT_ARGB);                        Graphics g = tag.getGraphics();                        g.drawImage(img, 0, 0, null); // 繪制縮小后的圖                        g.dispose();                        // 輸出為文件                        ImageIO.write(tag, formatType, new File(destDir + "_r" + i                                + "_c" + j + "."+formatType.toLowerCase()));                    }                }            }        } catch (Exception e)        {            e.printStackTrace();        }    }    /**     * 給圖片添加文字水印     *      * @param pressText     *            水印文字     * @param srcImageFile     *            源圖像地址     * @param destImageFile     *            目標圖像地址     * @param fontName     *            水印的字體名稱     * @param fontStyle     *            水印的字體樣式     * @param color     *            水印的字體顏色     * @param fontSize     *            水印的字體大小     * @param x     *            修正值     * @param y     *            修正值     * @param alpha     *            透明度：alpha 必須是范圍 [0.0, 1.0] 之內（包含邊界值）的一個浮點數字     * @param formatType     *              目標格式     */    public final static void pressText(String pressText, String srcImageFile,            String destImageFile, String fontName, int fontStyle, Color color,            int fontSize, int x, int y, float alpha,String formatType)    {        try        {            File img = new File(srcImageFile);            Image src = ImageIO.read(img);            int width = src.getWidth(null);            int height = src.getHeight(null);            BufferedImage image = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_ARGB);            Graphics2D g = image.createGraphics();            g.drawImage(src, 0, 0, width, height, null);            g.setColor(color);            g.setFont(new Font(fontName, fontStyle, fontSize));            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                    alpha));            // 在指定坐標繪制水印文字            g.drawString(pressText, (width - (getLength(pressText) * fontSize))                    / 2 + x, (height - fontSize) / 2 + y);            g.dispose();            ImageIO.write((BufferedImage) image, formatType,                    new File(destImageFile));// 輸出到文件流        } catch (Exception e)        {            e.printStackTrace();        }    }    /**     * 給圖片添加圖片水印     *      * @param pressImg     *            水印圖片     * @param srcImageFile     *            源圖像地址     * @param destImageFile     *            目標圖像地址     * @param x     *            修正值。 默認在中間     * @param y     *            修正值。 默認在中間     * @param alpha     *            透明度：alpha 必須是范圍 [0.0, 1.0] 之內（包含邊界值）的一個浮點數字     * @param formatType     *              目標格式     */     public final static void pressImage(String pressImg, String srcImageFile,            String destImageFile, int x, int y, float alpha,String formatType)    {        try        {            File img = new File(srcImageFile);            Image src = ImageIO.read(img);            int wideth = src.getWidth(null);            int height = src.getHeight(null);            BufferedImage image = new BufferedImage(wideth, height,                    BufferedImage.TYPE_INT_ARGB);            Graphics2D g = image.createGraphics();            g.drawImage(src, 0, 0, wideth, height, null);            // 水印文件            Image src_biao = ImageIO.read(new File(pressImg));            int wideth_biao = src_biao.getWidth(null);            int height_biao = src_biao.getHeight(null);            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,                    alpha));            g.drawImage(src_biao, (wideth - wideth_biao) / 2,                    (height - height_biao) / 2, wideth_biao, height_biao, null);            // 水印文件結束            g.dispose();            ImageIO.write((BufferedImage) image, formatType,                    new File(destImageFile));        } catch (Exception e)        {            e.printStackTrace();        }    }    /**     * 計算text的長度（一個中文算兩個字符）     *      * @param text     * @return     */    public final static int getLength(String text)    {        int length = 0;        for (int i = 0; i < text.length(); i++)        {            if (new String(text.charAt(i) + "").getBytes().length > 1)            {                length += 2;            } else            {                length += 1;            }        }        return length / 2;    }}轉自 http://www.jb51.net/article/60806.htm