斜水印,重复水印,文字 悟寰轩

转自：http://layicr.i.sohu.com/blog/view/180340898.htm

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.IIOException;
import javax.imageio.ImageIO;

 /**
  * 斜水印,重复水印,文字
  * @param pressText  文字
  * @param targetImg  目标图片
  * @param fontName 字体名称
  * @param colorStr 字体颜色字符串，格式如：#29944f
  * @param fontSize  字体大小
  * @param alpha 透明度(0.1-0.9)
  * @param carelessness true为字体实心,false为字体空心
  * @return
  */
 public static BufferedImage pressText(String pressText, String targetImg, String fontName, String colorStr, int fontSize, float alpha,boolean carelessness) {
  try {
   
   File file = new File(targetImg);
   
   Image src = ImageIO.read(file);
   
   //图片宽度
   int width = src.getWidth(null);
   //图片高度
   int height = src.getHeight(null);
   
   BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
   
   Graphics2D g2d  = image.createGraphics();
   //绘原图
   g2d.drawImage(src, 0, 0, width, height, null);
   //比例
   g2d.scale(1, 1);
   
   g2d.addRenderingHints(new RenderingHints(
     RenderingHints.KEY_ANTIALIASING,
     RenderingHints.VALUE_ANTIALIAS_ON));
   g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
     RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
   
   
   //颜色
   Color color = Color.decode(colorStr);
   
   //字体
   Font font = new Font(fontName, Font.PLAIN, fontSize);
   
   
   
   GlyphVector fontGV = font.createGlyphVector(g2d.getFontRenderContext(),
     pressText);
   Rectangle size = fontGV
     .getPixelBounds(g2d.getFontRenderContext(), 0, 0);
   Shape textShape = fontGV.getOutline();
   double textWidth = size.getWidth();
   double textHeight = size.getHeight();
   AffineTransform rotate45 = AffineTransform
     .getRotateInstance(Math.PI / 4d);
   Shape rotatedText = rotate45.createTransformedShape(textShape);
   // use a gradient that repeats 4 times
   g2d.setPaint(new GradientPaint(0, 0, color,
   image.getWidth() / 2, image.getHeight() / 2,color));
   
   //透明度
   g2d.setStroke(new BasicStroke(alpha));
   
   // step in y direction is calc'ed using pythagoras + 5 pixel padding 
   double yStep = Math.sqrt(textWidth * textWidth / 2) + 5;
   // step over image rendering watermark text     
   for (double x = -textHeight * 3; x < image.getWidth(); x += (textHeight * 3)) {
    double y = -yStep;
    for (; y < image.getHeight(); y += yStep) {
     g2d.draw(rotatedText);
     if(carelessness)//字体实心
     {
      g2d.fill(rotatedText);
     }
     g2d.translate(0, yStep);
    }
    g2d.translate(textHeight * 3, -(y + yStep));
   }
   
   g2d.dispose();
   
   return image;
  } catch(IIOException e){
   logger.warn(e);
  } catch (Exception e) {
   logger.warn(e);
  }
  return null;
 }