Java图片水印处理

mxiaoctrip 贡献于2012-08-09

作者 woyo  创建于2011-03-02 04:30:00   修改者woyo  修改于2011-03-02 04:31:00字数3666

文档摘要:Java图片水印处理
关键词:

Java图片水印处理 import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Image; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO;   public final class ImageUtils {       /**       * 图片水印       * @param pressImg 水印图片       * @param targetImg 目标图片       * @param x 修正值 默认在中间       * @param y 修正值 默认在中间       * @param alpha 透明度       */       public final static void pressImage(String pressImg, String targetImg, int x, int y, float alpha) {           try {               File img = new File(targetImg);               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);               //水印文件结束               g.dispose();               ImageIO.write((BufferedImage) image, "jpg", img);           } catch (Exception e) {               e.printStackTrace();           }       }         /**       * 文字水印       * @param pressText 水印文字       * @param targetImg 目标图片       * @param fontName 字体名称       * @param fontStyle 字体样式       * @param color 字体颜色       * @param fontSize 字体大小       * @param x 修正值       * @param y 修正值       * @param alpha 透明度       */       public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) {           try {               File img = new File(targetImg);               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));               g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);               g.dispose();               ImageIO.write((BufferedImage) image, "jpg", img);           } catch (Exception e) {               e.printStackTrace();           }       }         /**       * 缩放       * @param filePath 图片路径       * @param height 高度       * @param width 宽度       * @param bb 比例不对时是否需要补白       */       public static void resize(String filePath, int height, int width, boolean bb) {           try {               double ratio = 0.0; //缩放比例                File f = new File(filePath);               BufferedImage bi = ImageIO.read(f);               Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);               //计算比例               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) {                   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, "jpg", f);           } catch (IOException e) {               e.printStackTrace();           }       }         public static void main(String[] args) throws IOException {           pressImage("d:\\imgtest\\sy.jpg", "d:\\imgtest\\test1.jpg", 0, 0, 0.5f);           pressText("水印文字", "d:\\imgtest\\test1.jpg", "黑体", 12, Color.white, 80, 0, 0, 0.3f);           resize("d:\\imgtest\\test1.jpg", 500, 500, true);       }         public 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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