给图片增加水印

最新推荐文章于 2024-07-12 13:15:38 发布

原创最新推荐文章于 2024-07-12 13:15:38 发布 · 538 阅读

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本文介绍了一个Java程序，用于在图像上添加透明的文字水印。该程序利用了Java AWT和ImageIO库来处理图像，并支持自定义水印的位置、颜色、透明度等属性。

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;

public class ImageUtils {
	
	public BufferedImage addWatermark(InputStream is) {
		BufferedImage image = null;
		BufferedImage bufferedImage = null;
		try {
			image = ImageIO.read(is);
			bufferedImage = new BufferedImage(image.getWidth(),
				    image.getHeight(),BufferedImage.TYPE_INT_RGB);
				 BufferedImage watermarkImage = getWatermarkImage(180,180);
				        Graphics2D g2d = (Graphics2D)bufferedImage.getGraphics();
				        g2d.drawImage(image, 0, 0, null);
				        g2d.drawImage(watermarkImage, null, null);
				        g2d.dispose();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		  return bufferedImage;
	}
	
	

	public BufferedImage getWatermarkImage(int width, int height){
		  BufferedImage watermarkImg =
		   new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
		  AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.5f);

		  Graphics2D g2d  = (Graphics2D)watermarkImg.createGraphics();

		  g2d.setComposite(alpha);

		  String waterMark = "SML - SAMPLE ONLY - ";
		  g2d.setColor(Color.LIGHT_GRAY);
		  g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
		                        RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

		  g2d.setFont(new Font("Arial", Font.BOLD, 18));


		  FontMetrics fontMetrics = g2d.getFontMetrics();
		  Rectangle2D rect = fontMetrics.getStringBounds(waterMark, g2d);

		  int centerX = (width - (int) rect.getWidth()) / 2;
		  int centerY = (height - (int) rect.getHeight()) / 2;

		  int y = 10;
		  //int width = watermarkImg.getHeight();

		  AffineTransform origXform = g2d.getTransform();
		  for (int i = 0; i < centerY; i = i + 30) {
		    for (int x = 0; x < width; x++) {
		      g2d.rotate(Math.toRadians(35), x, y);
		      g2d.drawString(waterMark, x, y);
		      g2d.setTransform(origXform);
		      x += 125;
		    }
		    if (centerY > 1000) {
		     y += 100;
		    } else {
		     y += 50;
		    }
		  }
		  //Free graphic resources
		  g2d.dispose();

		  return watermarkImg;

		 }

------------------------------------------------代码引用

ImageUtils iu = new ImageUtils();
InputStream is = this.getImage(imageName);
BufferedImage  bi = iu.addWatermark(is);