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 程式師世界 >> 編程語言 >> 網頁編程 >> JSP編程 >> 關於JSP >> java圖片處理類(圖片水印,圖片縮放)

java圖片處理類(圖片水印,圖片縮放)

編輯:關於JSP

    可實現以下常用功能: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

     代碼如下 復制代碼
    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.Toolkit;
    import java.awt.color.ColorSpace;
    import java.awt.geom.AffineTransform;
    import java.awt.image.AffineTransformOp;
    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.io.File;
    import java.io.IOException;

    import javax.imageio.ImageIO;

    /**
     * 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
     * @author Administrator
     */
    public class ImageUtils {

        /**
         * 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操作系統中的標准圖像文件格式
        public static String IMAGE_TYPE_PNG = "png";// 可移植網絡圖形
        public static String IMAGE_TYPE_PSD = "psd";// Photoshop的專用格式Photoshop

        /**
         * 程序入口:用於測試
         * @param args
         */
        public static void main(String[] args) {
            // 1-縮放圖像:
            // 方法一:按比例縮放
            ImageUtils.scale("e:/abc.jpg", "e:/abc_scale.jpg", 2, true);//測試OK
            // 方法二:按高度和寬度縮放
            ImageUtils.scale2("e:/abc.jpg", "e:/abc_scale2.jpg", 500, 300, true);//測試OK

            // 2-切割圖像:
            // 方法一:按指定起點坐標和寬高切割
            ImageUtils.cut("e:/abc.jpg", "e:/abc_cut.jpg", 0, 0, 400, 400 );//測試OK
            // 方法二:指定切片的行數和列數
            ImageUtils.cut2("e:/abc.jpg", "e:/", 2, 2 );//測試OK
            // 方法三:指定切片的寬度和高度
            ImageUtils.cut3("e:/abc.jpg", "e:/", 300, 300 );//測試OK

            // 3-圖像類型轉換:
            ImageUtils.convert("e:/abc.jpg", "GIF", "e:/abc_convert.gif");//測試OK

            // 4-彩色轉黑白:
            ImageUtils.gray("e:/abc.jpg", "e:/abc_gray.jpg");//測試OK

            // 5-給圖片添加文字水印:
            // 方法一:
            ImageUtils.pressText("我是水印文字","e:/abc.jpg","e:/abc_pressText.jpg","宋體",Font.BOLD,Color.white,80, 0, 0, 0.5f);//測試OK
            // 方法二:
            ImageUtils.pressText2("我也是水印文字", "e:/abc.jpg","e:/abc_pressText2.jpg", "黑體", 36, Color.white, 80, 0, 0, 0.5f);//測試OK
           
            // 6-給圖片添加圖片水印:
            ImageUtils.pressImage("e:/abc2.jpg", "e:/abc.jpg","e:/abc_pressImage.jpg", 0, 0, 0.5f);//測試OK
        }

        /**
         * 縮放圖像(按比例縮放)
         * @param srcImageFile 源圖像文件地址
         * @param result 縮放後的圖像地址
         * @param scale 縮放比例
         * @param flag 縮放選擇:true 放大; false 縮小;
         */
        public final static void scale(String srcImageFile, String result,
                int scale, boolean flag) {
            try {
                BufferedImage src = ImageIO.read(new File(srcImageFile)); // 讀入文件
                int width = src.getWidth(); // 得到源圖寬
                int height = src.getHeight(); // 得到源圖長
                if (flag) {// 放大
                    width = width * scale;
                    height = height * scale;
                } else {// 縮小
                    width = width / scale;
                    height = height / scale;
                }
                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); // 繪制縮小後的圖
                g.dispose();
                ImageIO.write(tag, "JPEG", new File(result));// 輸出到文件流
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        /**
         * 縮放圖像(按高度和寬度縮放)
         * @param srcImageFile 源圖像文件地址
         * @param result 縮放後的圖像地址
         * @param height 縮放後的高度
         * @param width 縮放後的寬度
         * @param bb 比例不對時是否需要補白:true為補白; false為不補白;
         */
        public final static void scale2(String srcImageFile, String result, int height, int width, boolean bb) {
            try {
                double ratio = 0.0; // 縮放比例
                File f = new File(srcImageFile);
                BufferedImage bi = ImageIO.read(f);
                Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);
                // 計算比例
                if ((bi.getHeight() > height) || (bi.getWidth() > width)) {
                    if (bi.getHeight() > bi.getWidth()) {
                        ratio = (new Integer(height)).doubleValue()
                                / bi.getHeight();
                    } else {
                        ratio = (new Integer(width)).doubleValue() / bi.getWidth();
                    }
                    AffineTransformOp op = new AffineTransformOp(AffineTransform
                            .getScaleInstance(ratio, ratio), null);
                    itemp = op.filter(bi, null);
                }
                if (bb) {//補白
                    BufferedImage image = new BufferedImage(width, height,
                            BufferedImage.TYPE_INT_RGB);
                    Graphics2D g = image.createGraphics();
                    g.setColor(Color.white);
                    g.fillRect(0, 0, width, height);
                    if (width == itemp.getWidth(null))
                        g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2,
                                itemp.getWidth(null), itemp.getHeight(null),
                                Color.white, null);
                    else
                        g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0,
                                itemp.getWidth(null), itemp.getHeight(null),
                                Color.white, null);
                    g.dispose();
                    itemp = image;
                }
                ImageIO.write((BufferedImage) itemp, "JPEG", new File(result));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
       
        /**
         * 圖像切割(按指定起點坐標和寬高切割)
         * @param srcImageFile 源圖像地址
         * @param result 切片後的圖像地址
         * @param x 目標切片起點坐標X
         * @param y 目標切片起點坐標Y
         * @param width 目標切片寬度
         * @param height 目標切片高度
         */
        public final static void cut(String srcImageFile, String result,
                int x, int y, int width, int height) {
            try {
                // 讀取源圖像
                BufferedImage bi = ImageIO.read(new File(srcImageFile));
                int srcWidth = bi.getHeight(); // 源圖寬度
                int srcHeight = bi.getWidth(); // 源圖高度
                if (srcWidth > 0 && srcHeight > 0) {
                    Image image = bi.getScaledInstance(srcWidth, srcHeight,
                            Image.SCALE_DEFAULT);
                    // 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)
                    ImageFilter cropFilter = new CropImageFilter(x, y, width, height);
                    Image img = Toolkit.getDefaultToolkit().createImage(
                            new FilteredImageSource(image.getSource(),
                                    cropFilter));
                    BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                    Graphics g = tag.getGraphics();
                    g.drawImage(img, 0, 0, width, height, null); // 繪制切割後的圖
                    g.dispose();
                    // 輸出為文件
                    ImageIO.write(tag, "JPEG", new File(result));
                }
            } 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 descDir 切片目標文件夾
         * @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 cut2(String srcImageFile, String descDir,
                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 srcWidth = bi.getHeight(); // 源圖寬度
                int srcHeight = bi.getWidth(); // 源圖高度
                if (srcWidth > 0 && srcHeight > 0) {
                    Image img;
                    ImageFilter cropFilter;
                    Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
                    int destWidth = srcWidth; // 每張切片的寬度
                    int destHeight = srcHeight; // 每張切片的高度
                    // 計算切片的寬度和高度
                    if (srcWidth % cols == 0) {
                        destWidth = srcWidth / cols;
                    } else {
                        destWidth = (int) Math.floor(srcWidth / cols) + 1;
                    }
                    if (srcHeight % rows == 0) {
                        destHeight = srcHeight / rows;
                    } else {
                        destHeight = (int) Math.floor(srcWidth / 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_RGB);
                            Graphics g = tag.getGraphics();
                            g.drawImage(img, 0, 0, null); // 繪制縮小後的圖
                            g.dispose();
                            // 輸出為文件
                            ImageIO.write(tag, "JPEG", new File(descDir
                                    + "_r" + i + "_c" + j + ".jpg"));
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        /**
         * 圖像切割(指定切片的寬度和高度)
         * @param srcImageFile 源圖像地址
         * @param descDir 切片目標文件夾
         * @param destWidth 目標切片寬度。默認200
         * @param destHeight 目標切片高度。默認150
         */
        public final static void cut3(String srcImageFile, String descDir,
                int destWidth, int destHeight) {
            try {
                if(destWidth<=0) destWidth = 200; // 切片寬度
                if(destHeight<=0) destHeight = 150; // 切片高度
                // 讀取源圖像
                BufferedImage bi = ImageIO.read(new File(srcImageFile));
                int srcWidth = bi.getHeight(); // 源圖寬度
                int srcHeight = bi.getWidth(); // 源圖高度
                if (srcWidth > destWidth && srcHeight > destHeight) {
                    Image img;
                    ImageFilter cropFilter;
                    Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);
                    int cols = 0; // 切片橫向數量
                    int rows = 0; // 切片縱向數量
                    // 計算切片的橫向和縱向數量
                    if (srcWidth % destWidth == 0) {
                        cols = srcWidth / destWidth;
                    } else {
                        cols = (int) Math.floor(srcWidth / destWidth) + 1;
                    }
                    if (srcHeight % destHeight == 0) {
                        rows = srcHeight / destHeight;
                    } else {
                        rows = (int) Math.floor(srcHeight / destHeight) + 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_RGB);
                            Graphics g = tag.getGraphics();
                            g.drawImage(img, 0, 0, null); // 繪制縮小後的圖
                            g.dispose();
                            // 輸出為文件
                            ImageIO.write(tag, "JPEG", new File(descDir
                                    + "_r" + i + "_c" + j + ".jpg"));
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        /**
         * 圖像類型轉換:GIF->JPG、GIF->PNG、PNG->JPG、PNG->GIF(X)、BMP->PNG
         * @param srcImageFile 源圖像地址
         * @param formatName 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(String srcImageFile, String formatName, String destImageFile) {
            try {
                File f = new File(srcImageFile);
                f.canRead();
                f.canWrite();
                BufferedImage src = ImageIO.read(f);
                ImageIO.write(src, formatName, new File(destImageFile));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        /**
         * 彩色轉為黑白
         * @param srcImageFile 源圖像地址
         * @param destImageFile 目標圖像地址
         */
        public final static void gray(String srcImageFile, String destImageFile) {
            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);
                ImageIO.write(src, "JPEG", new File(destImageFile));
            } catch (IOException 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
         */
        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) {
            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_RGB);
                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, "JPEG", new File(destImageFile));// 輸出到文件流
            } 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 字體名稱
         * @param fontStyle 字體樣式
         * @param color 字體顏色
         * @param fontSize 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
         */
        public final static void pressText2(String pressText, String srcImageFile,String destImageFile,
                String fontName, int fontStyle, Color color, int fontSize, int x,
                int y, float alpha) {
            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_RGB);
                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, "JPEG", new File(destImageFile));
            } 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
         */
        public final static void pressImage(String pressImg, String srcImageFile,String destImageFile,
                int x, int y, float alpha) {
            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_RGB);
                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,  "JPEG", 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;
        }
    }
     

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