图片添加水印
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public class WaterMark {??
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??? /**?
???? * 获取指定矩形中的像素的矩阵?
???? *??
???? * @param imageSrc?
???? * @param startX?
???? * @param startY?
???? * @param w?
???? * @param h?
???? * @return?
???? */?
??? private int[] getPixArray(Image imageSrc, int startX, int startY,??
??????????? int w, int h) {??
??????? int[] pix = new int[(w - startX) * (h - startY)];??
??????????
??????? /*下面是别人程序中的一段,我实在不明白为何要加这一段,因为我去掉也没有问题,加上还会报错*/?
??????? PixelGrabber pg = null;??
??????? try {??
??????????? pg = new PixelGrabber(imageSrc, startX, startY, w-startX, h-startY, pix, 0, w);??
??????????? if (pg.grabPixels() != true) {??
??????????????? try {??
??????????????????? throw new java.awt.AWTException("pg error" + pg.status());??
??????????????? } catch (Exception eq) {??
??????????????????? eq.printStackTrace();??
??????????????? }??
??????????? }??
??????? } catch (Exception ex) {??
??????????? ex.printStackTrace();??
??????? }??
??????? return pix;??
??? }??
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??? /**?
???? * 将1张图片和另1张图片的指定区域重合。可用于制作水印。图片的左上角坐标为0，0?
???? *??
???? * @param lightnessWaterImg?
???? *??????????? 颜色比较亮的水印图片，适合底色比较暗的情况?
???? * @param darknessWaterImg?
???? *??????????? 颜色比较暗的水印图片，适合底色比较亮的情况,如果不想区分，则输入null，平均灰度边界同时失效。?
???? * @param targetImg?
???? *??????????? 源图片?
???? * @param startX?
???? * @param startY?
???? * @param x?
???? * @param y?
???? * @param alpha?
???? *??????????? 透明度,0f为全透明,1f为完全不透明,0.5f为半透明?
???? * @param averageGray?
???? *??????????? 平均灰度边界（0-255），大于此值，则打暗的水印图片，小于此值则打亮的水印图片。?
???? *??????????? 默认值128。超过范围，按默认值进行。?
???? */?
??? private final void pressImage(String lightnessWaterImg,??
??????????? String darknessWaterImg, String targetImg, int startX, int startY,??
??????????? int x, int y, float alpha, float averageGray) {??
??????? try {??
??????????? // 先判断亮水印和源文件的值是否为null，否则抛出异常??
??????????? if (lightnessWaterImg == null || lightnessWaterImg == ""?
??????????????????? || targetImg == null || targetImg == "") {??
??????????????? throw new Exception("亮水印或者源图片的地址不能为空");??
??????????? }???
??????????? // 再判断平均灰度边界是否越界??
??????????? if (averageGray>255||averageGray<0) {??
??????????????? averageGray = 128;??
??????????? }??
??????????????
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??????????? // 装载源图片??
??????????? File _file = new File(targetImg);??
??????????? // 图片装入内存??
??????????? BufferedImage src = ImageIO.read(_file);??
??????????? // 获取图片的尺寸??
??????????? int width = src.getWidth(null);??
??????????? int height = src.getHeight(null);??
??????????? // 根据源图片尺寸，设置预装载的一个图片，默认是RGB格式的??
??????????? BufferedImage image = new BufferedImage(width, height,??
??????????????????? BufferedImage.TYPE_INT_RGB);??
??????????? Graphics2D graphics = image.createGraphics();??
??????????? // 绘制内存中的源图片至指定的矩形内??
??????????? graphics.drawImage(src, 0, 0, width, height, null);??
??????????? // 在已经绘制的图片中加入透明度通道??
??????????? graphics.setComposite(AlphaComposite.getInstance(??
??????????????????? AlphaComposite.SRC_ATOP, alpha));??
??????????????
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??????????? // 获取源图片中和设定的同样大小的区域内的像素集合??
??????????? int[] pixels = getPixArray(src, startX, startY, x, y);??
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??????????? //查询此集合的平均灰度??
??????????? float average = getAverageGrap(x-startX,y-startY,pixels);??
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??????????? // 如果平均灰度大于130,则说明此区域比较亮，否则则比较暗??
??????????? System.out.println(average);??
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??????????????
??????????? //装载水印图片所需参数??
??????????? File water;??
??????????? BufferedImage bufferwater;??
??????????????
??????????? // 根据设定的平均灰度边界来装载不同的水印??
??????????? if (darknessWaterImg == null||average>=averageGray) {??
??????????????? // 装载亮水印文件??
??????????????? water = new File(darknessWaterImg);??
??????????? }else{??
??????????????? // 装载暗水印文件??
??????????????? water = new File(lightnessWaterImg);??
??????????? }??
??????????? // 装入内存??
??????????? bufferwater = ImageIO.read(water);??
??????????????????????????
??????????? graphics.drawImage(bufferwater, startX, startY, x, y,??
??????????????????? null);??
??????????? // 水印文件结束??
??????????? graphics.dispose();??
??????????? FileOutputStream out = new FileOutputStream(targetImg);??
??????????? JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);??
??????????? // 绘制新的文件??
??????????? encoder.encode(image);??
??????????? out.close();??
??????????????
??????? } catch (Exception e) {??
??????????? e.printStackTrace();??
??????? }??
??? }??
??????????
??? /**?
???? * 查询某个区域的平均灰度?
???? * @param width?
???? * @param height?
???? * @param pixels?
???? * @return?
???? */?
??? private float getAverageGrap(int width,int height,int[] pixels){??
??????? /* 下面是开始算这个区域的亮度了，灰度等同于亮度 */?
??????? ColorModel colorModel = ColorModel.getRGBdefault();??
??????? int i = 0;??
??????? int j = 0;??
??????? int k = 0;??
??????? int r = 0;??
??????? int g = 0;??
??????? int b = 0;??
??????? int gray = 0;??
??????? float average = 0;// 平均灰度??
??????? for (i = 0; i < height; i++) {??
??????????? for (j = 0; j < width; j++) {??
??????????????? // 定位像素点??
??????????????? k = i * width + j;??
??????????????? r = colorModel.getRed(pixels[k]);??
??????????????? g = colorModel.getGreen(pixels[k]);??
??????????????? b = colorModel.getBlue(pixels[k]);??
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??????????????? // 计算灰度值??
??????????????? gray = (r * 38 + g * 75 + b * 15) >> 7;??
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??????????????? average = average + gray;??
??????????? }??
??????? }??
??????? // 计算平均灰度??
??????? average = average / ((i - 1) * (j - 1));??
??????? return average;??
??? }??
??? public static void main(String[] args) {??
??????? WaterMark waterMark = new WaterMark();??
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??????? waterMark.pressImage("d:\\aa.png", "d:\\aa.png",??
??????????????? "d:\\2.jpg", 520, 500, 900, 800, 0.5f, 50);??
??????? System.out.print("添加成功");??
??? }??
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