簡略的java圖片處置類(圖片水印 圖片縮放)

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;

/**
 * 圖片處置對象類：<br>
 * 功效：縮放圖象、切割圖象、圖象類型轉換、黑色轉诟谇、文字水印、圖片水印等
 * @author Administrator
 */
public class ImageUtils {

    /**
     * 幾種罕見的圖片格局
     */
    public static String IMAGE_TYPE_GIF = "gif";// 圖形交流格局
    public static String IMAGE_TYPE_JPG = "jpg";// 結合照片專家組
    public static String IMAGE_TYPE_JPEG = "jpeg";// 結合照片專家組
    public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap（位圖）的簡寫，它是Windows操作體系中的尺度圖象文件格局
    public static String IMAGE_TYPE_PNG = "png";// 可移植收集圖形
    public static String IMAGE_TYPE_PSD = "psd";// Photoshop的公用格局Photoshop

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

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

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

        // 4-黑色轉诟谇：
        ImageUtils.gray("e:/abc.jpg", "e:/abc_gray.jpg");//測試OK

        // 5-給圖片添加文字水印：
        // 辦法一：
        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
        // 辦法二：
        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
    }

    /**
     * 縮放圖象（按比例縮放）
     * @param srcImageFile 源圖象文件地址
     * @param result 縮放後的圖象地址
     * @param scale 縮放比例
     * @param flag 縮放選擇:true 縮小; false 減少;
     */
    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(); // 獲得源圖寬
            int height = src.getHeight(); // 獲得源圖長
            if (flag) {// 縮小
                width = width * scale;
                height = height * scale;
            } else {// 減少
                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); // 繪制減少後的圖
            g.dispose();
            ImageIO.write(tag, "JPEG", new File(result));// 輸入到文件流
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 縮放圖象（按高度和寬度縮放）
     * @param srcImageFile 源圖象文件地址
     * @param result 縮放後的圖象地址
     * @param height 縮放後的高度
     * @param width 縮放後的寬度
     * @param bb 比例纰謬時能否須要補白：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);
            // 盤算比例
            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();
        }
    }

    /**
     * 圖象切割(按指定終點坐標和寬高切割)
     * @param srcImageFile 源圖象地址
     * @param result 切片後的圖象地址
     * @param x 目的切片終點坐標X
     * @param y 目的切片終點坐標Y
     * @param width 目的切片寬度
     * @param height 目的切片高度
     */
    public final static void cut(String srcImageFile, String result,
            int x, int y, int width, int height) {
        try {
            // 讀取源圖象
            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);
                // 四個參數分離為圖象終點坐標和寬高
                // 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();
                // 輸入為文件
                ImageIO.write(tag, "JPEG", new File(result));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 圖象切割（指定切片的行數和列數）
     * @param srcImageFile 源圖象地址
     * @param descDir 切片目的文件夾
     * @param rows 目的切片行數。默許2，必需是規模 [1, 20] 以內
     * @param cols 目的切片列數。默許2，必需是規模 [1, 20] 以內
     */
    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
            // 讀取源圖象
            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
                // 盤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;
                }
                // 輪回樹立切片
                // 改良的設法主意:能否可用多線程加速切割速度
                for (int i = 0; i < rows; i++) {
                    for (int j = 0; j < cols; j++) {
                        // 四個參數分離為圖象終點坐標和寬高
                        // 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); // 繪制減少後的圖
                        g.dispose();
                        // 輸入為文件
                        ImageIO.write(tag, "JPEG", new File(descDir
                                + "_r" + i + "_c" + j + ".jpg"));
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 圖象切割（指定切片的寬度和高度）
     * @param srcImageFile 源圖象地址
     * @param descDir 切片目的文件夾
     * @param destWidth 目的切片寬度。默許200
     * @param destHeight 目的切片高度。默許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
            // 讀取源圖象
            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; // 切片橫向數目
                int rows = 0; // 切片縱向數目
                // 盤算切片的橫向和縱向數目
                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;
                }
                // 輪回樹立切片
                // 改良的設法主意:能否可用多線程加速切割速度
                for (int i = 0; i < rows; i++) {
                    for (int j = 0; j < cols; j++) {
                        // 四個參數分離為圖象終點坐標和寬高
                        // 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); // 繪制減少後的圖
                        g.dispose();
                        // 輸入為文件
                        ImageIO.write(tag, "JPEG", new File(descDir
                                + "_r" + i + "_c" + j + ".jpg"));
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 圖象類型轉換：GIF->JPG、GIF->PNG、PNG->JPG、PNG->GIF(X)、BMP->PNG
     * @param srcImageFile 源圖象地址
     * @param formatName 包括格局非正式稱號的 String：如JPG、JPEG、GIF等
     * @param destImageFile 目的圖象地址
     */
    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();
        }
    }

    /**
     * 黑色轉為诟谇
     * @param srcImageFile 源圖象地址
     * @param destImageFile 目的圖象地址
     */
    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 源圖象地址
     * @param destImageFile 目的圖象地址
     * @param fontName 水印的字體稱號
     * @param fontStyle 水印的字體款式
     * @param color 水印的字體色彩
     * @param fontSize 水印的字體年夜小
     * @param x 修改值
     * @param y 修改值
     * @param alpha 通明度：alpha 必需是規模 [0.0, 1.0] 以內（包括界限值）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));// 輸入到文件流
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 給圖片添加文字水印
     * @param pressText 水印文字
     * @param srcImageFile 源圖象地址
     * @param destImageFile 目的圖象地址
     * @param fontName 字體稱號
     * @param fontStyle 字體款式
     * @param color 字體色彩
     * @param fontSize 字體年夜小
     * @param x 修改值
     * @param y 修改值
     * @param alpha 通明度：alpha 必需是規模 [0.0, 1.0] 以內（包括界限值）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 源圖象地址
     * @param destImageFile 目的圖象地址
     * @param x 修改值。 默許在中央
     * @param y 修改值。 默許在中央
     * @param alpha 通明度：alpha 必需是規模 [0.0, 1.0] 以內（包括界限值）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);
            // 水印文件停止
            g.dispose();
            ImageIO.write((BufferedImage) image,  "JPEG", new File(destImageFile));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 盤算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;
    }
}