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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,重復水印,文字,并且生成文件 * @param targetImg 目標圖片 * @param newImg 生成的文件路徑 * @param pressText 文字 * @param fontName 字體名稱 * @param colorStr 字體顏色字符串,格式如:#29944f * @param fontSize 字體大小 * @param alpha 透明度(0.1-0.9) * @param carelessness true為字體實心,false為字體空心 * @param colSpacing 行間距(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,重復水印,文字 * @param targetImg 目標圖片 * @param pressText 文字 * @param fontName 字體名稱 * @param colorStr 字體顏色字符串,格式如:#29944f * @param fontSize 字體大小 * @param alpha 透明度(0.1-0.9) * @param carelessness true為字體實心,false為字體空心 * @param colSpacing 行間距(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);
//圖片寬度 int width = src.getWidth(null); //圖片高度 int height = src.getHeight(null);
image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
g2d = image.createGraphics(); //繪原圖 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);
//顏色 Color color = Color.decode(colorStr);
//字體 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)//字體實心 { g2d.fill(rotatedText); } g2d.translate(0, yStep); } g2d.translate(textHeight * colSpacing, -(y + yStep)); } } finally { if (g2d != null) { g2d.dispose(); } } return image; } }
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