最近项目在做一个商城项目, 项目上的图片要添加水印①,添加图片水印;②:添加文字水印;一下提供下个方法,希望大家可以用得着   复制代码 代码如下:
package com.blogs.image;
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.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
/**
 * 图片水印
 */
public class ImageUtil {
    /**
     * @param args
     */
    public static void main(String[] args) {
        String srcImgPath = "e:/2.png";
        String iconPath = "e:logo.jpg";
        String targerPath = "e:/3.jpg";
        // 给图片添加水印
        ImageUtil.waterMarkImageByIcon(iconPath, srcImgPath, targerPath, 0, 0,
, 0.1f);
        // 给图片添加水印,水印旋转-45
        // ImageMarkLogoByIcon.markImageByIcon(iconPath, srcImgPath,
        // targerPath2, -45);
    }
    /**
     * 给图片添加水印、可设置水印图片旋转角度
     *
     * @param iconPath
     *            水印图片路径
     * @param srcImgPath
     *            源图片路径
     * @param targerPath
     *            目标图片路径
     * @param degree
     *            水印图片旋转角度
     * @param width
     *            宽度(与左相比)
     * @param height
     *            高度(与顶相比)
     * @param clarity
     *            透明度(小于1的数)越接近0越透明
     */
    public static void waterMarkImageByIcon(String iconPath, String srcImgPath,
            String targerPath, Integer degree, Integer width, Integer height,
            float clarity) {
        OutputStream os = null;
        try {
            Image srcImg = ImageIO.read(new File(srcImgPath));
            System.out.println("width:" + srcImg.getWidth(null));
            System.out.println("height:" + srcImg.getHeight(null));
            BufferedImage buffImg = new BufferedImage(srcImg.getWidth(null),
                    srcImg.getHeight(null), BufferedImage.TYPE_INT_RGB);
            // 得到画笔对象
            // Graphics g= buffImg.getGraphics();
            Graphics2D g = buffImg.createGraphics();
            // 设置对线段的锯齿状边缘处理
            g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g.drawImage(
                    srcImg.getScaledInstance(srcImg.getWidth(null),
                            srcImg.getHeight(null), Image.SCALE_SMOOTH), 0, 0,
                    null);
            if (null != degree) {
                // 设置水印旋转
                g.rotate(Math.toRadians(degree),
                        (double) buffImg.getWidth() / 2,
                        (double) buffImg.getHeight() / 2);
            }
            // 水印图象的路径 水印一般为gif或者png的，这样可设置透明度
            ImageIcon imgIcon = new ImageIcon(iconPath);
            // 得到Image对象。
            Image img = imgIcon.getImage();
            float alpha = clarity; // 透明度
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
                    alpha));
            // 表示水印图片的位置
            g.drawImage(img, width, height, null);
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
            g.dispose();
            os = new FileOutputStream(targerPath);
            // 生成图片
            ImageIO.write(buffImg, "JPG", os);
            System.out.println("添加水印图片完成!"