java 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.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public final class ImageUtils {
    public ImageUtils() {

    }

    /** *//**
     * 把图片印刷到图片上
     *
     * @param pressImg --
     *            水印文件
     * @param targetImg --
     *            目标文件
     * @param x
     *            --x坐标
     * @param y
     *            --y坐标
     * @param alpha
     *           --透明度     
     */
    public final static void pressImage(String pressImg, String targetImg,
            int x, int y,float alpha) {
        try {
            //目标文件
        float Alpha=alpha;
            File _file = new File(targetImg);
            Image src = ImageIO.read(_file);
            int wideth = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(wideth, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g = image.createGraphics();
            g.drawImage(src, 0, 0, wideth, height, null);
            //水印文件
            File _filebiao = new File(pressImg);
            Image src_biao = ImageIO.read(_filebiao);
            int wideth_biao = src_biao.getWidth(null);
            int height_biao = src_biao.getHeight(null);
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
               Alpha));           
            g.drawImage(src_biao, (wideth - wideth_biao) / 2,
                        (height - height_biao) / 2, wideth_biao, height_biao, null);
            //水印文件结束
            g.dispose();
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /** *//**
     * 打印文字水印图片
     *
     * @param pressText
     *            --文字
     * @param targetImg --
     *            目标图片
     * @param fontName --
     *            字体名
     * @param fontStyle --
     *            字体样式
     * @param color --
     *            字体颜色
     * @param fontSize --
     *            字体大小
     * @param x --
     *            偏移量
     * @param y
     */

    public static void pressText(String pressText, String targetImg,
            String fontName, int fontStyle, int color, int fontSize, int x,
            int y,float alpha) {
        try {
        float Alpha=alpha;
            File _file = new File(targetImg);
            Image src = ImageIO.read(_file);
            int wideth = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(wideth, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g = image.createGraphics();
            
            g.drawImage(src, 0, 0, wideth, height, null);
            g.setColor(Color.RED);
            g.setFont(new Font(fontName, fontStyle, fontSize));
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
               Alpha)); 
            g.drawString(pressText, wideth - fontSize - x, height - fontSize
                    / 2 - y);
            g.dispose();
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static void main(String[] args) {
        pressImage("C:/media/pic/book_jinghua.gif", "C:/media/pic/123.jpg", 180, 60,0.5f);//img
//        pressText("C:/media/pic/0007025494.jpg", "C:/media/pic/123.jpg","隶书",36,36,36, 300, 400,0.6f);//text
        System.out.print("添加成功");
    }
}