Java为图片添加文字或图片水印

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class Main {
	public static void main(String[] args) throws IOException {
		Font font = new Font("04b_08", Font.PLAIN, 30);//字体
        String sourceImg="D:\\test\\123.jpg"; //源图片地址
        String targetImg="D:\\test\\watermark\\123.jpg"; //新存储的地址
        String watermark="图片出处:www.baidu.com";//水印内容
        String watermarkUrl="D:\\test\\zy.png";
        Color color=new Color(255,255,255,128);
        addWatermark(sourceImg, targetImg,watermark, color,font);
        markImgMark(watermarkUrl,sourceImg,targetImg);
	}
	
	/**
	 * 为图片添加图片水印
	 * @param watermarkUrl 原图
	 * @param source 水印图片
	 * @param output 制作完成的图片
	 * @return
	 * @throws IOException
	 */
	public static String markImgMark(String watermarkUrl, String source, String output) throws IOException {
		String result = "添加图片水印出错";
		File file = new File(source);
		Image img = ImageIO.read(file);
		int width = img.getWidth(null);//水印宽度
		int height = img.getHeight(null);//水印高
		BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics2D g = bi.createGraphics();
		g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
		g.drawImage(img.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
		ImageIcon imgIcon = new ImageIcon(watermarkUrl);
		Image con = imgIcon.getImage();
		float clarity = 0.6f;//透明度
		g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, clarity));
		g.drawImage(con, 10, 10, null);//水印的位置
		g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
		g.dispose();
		File sf = new File(output);
		ImageIO.write(bi, "jpg", sf); // 保存图片
		System.out.println("添加图片水印成功");
		return result;
	}
	
	/** 设置文字水印
     * @param sourceImg 源图片路径
     * @param targetImg 保存的图片路径
     * @param watermark 水印内容
     * @param color 水印颜色
     * @param font 水印字体
	 * @throws IOException 
     */
    public static void addWatermark(String sourceImg, String targetImg, String watermark,Color color,Font font) throws IOException {
            File srcImgFile = new File(sourceImg);
            Image srcImg = ImageIO.read(srcImgFile);
            int srcImgWidth = srcImg.getWidth(null);
            int srcImgHeight = srcImg.getHeight(null);
            BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = bufImg.createGraphics();
            g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
            g.setColor(color);
            g.setFont(font);
            //设置水印的坐标
            int x = srcImgWidth - (g.getFontMetrics(g.getFont()).charsWidth(watermark.toCharArray(), 0, watermark.length())+20);  
            int y = srcImgHeight - 25;  
            g.drawString(watermark, x, y);  //加水印
            g.dispose();  
            // 输出图片  
            FileOutputStream outImgStream = new FileOutputStream(targetImg);  
            ImageIO.write(bufImg, "jpg", outImgStream);
            System.out.println("添加水印完成");  
            outImgStream.flush();  
            outImgStream.close();  
    }
}