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| 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 java.io.IOException;
import javax.imageio.ImageIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class WatermarkHelper {
private static Logger logger = LoggerFactory
.getLogger(WatermarkHelper.class);
/**
* 斜水印,重复水印,文字,并且生成文件
* @param targetImg 目标图片
* @param newImg 生成的文件路径
* @param pressText 文字
* @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
* @param colSpacing 行间距(1-10)
* @return
*/
public static boolean pressText(String targetImg, String newImg,String pressText,
String fontName, String colorStr, int fontSize, float alpha,
boolean carelessness, int colSpacing)
{
boolean isok = false;
try
{
BufferedImage image = pressText(targetImg, pressText, fontName, colorStr, fontSize, alpha, carelessness, colSpacing);
File fileout = new File(newImg);
ImageIO.write(image, "JPEG", fileout);
isok = true;
}catch(Exception ex)
{
logger.error(ex.getMessage(),ex);
}
return isok;
}
/**
* 斜水印,重复水印,文字
* @param targetImg 目标图片
* @param pressText 文字
* @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
* @param colSpacing 行间距(1-10)
* @return
* @throws IOException
*/
public static BufferedImage pressText(String targetImg,String pressText,
String fontName, String colorStr, int fontSize, float alpha,
boolean carelessness, int colSpacing) throws IOException {
BufferedImage image = null;
Graphics2D g2d = null;
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);
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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) + 10;
// step over image rendering watermark text
for (double x = -textHeight * colSpacing; x < image.getWidth(); x += (textHeight * colSpacing)) {
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 * colSpacing, -(y + yStep));
}
} finally {
if (g2d != null) {
g2d.dispose();
}
}
return image;
}
}
|
