java 图片水印

(转自 http://blog.csdn.net/liusong721/archive/2009/08/13/4442649.aspx)

package test01;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;

import javax.swing.ImageIcon;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class Graphics {

/**
* 图片加水印的方法
*
* @param waterMask
* 水印图片的地址
* @param picturePath
* 要加水印的图片地址
* @param newPicturePath
* 得到新图片的地址
* @return 得到新图片的地址
*/
@SuppressWarnings("static-access")
public static void WaterMask(String waterMask, String picturePath,
String newPicturePath) {

// 先画出原图的
ImageIcon imgIcon = new ImageIcon(picturePath);
Image theImg = imgIcon.getImage();
int width = theImg.getWidth(null);
int height = theImg.getHeight(null);

BufferedImage bimage = new BufferedImage(width, height, 1);
Graphics2D g = bimage.createGraphics();
// g.setBackground(Color.white);

g.drawImage(theImg, 0, 0, null);

// 再画出水印
ImageIcon waterIcon = new ImageIcon(waterMask);
Image waterImg = waterIcon.getImage();
int waterWidth = waterImg.getWidth(null);
int waterHeight = waterImg.getHeight(null);

g.drawImage(waterImg, width - waterWidth, height - waterHeight,
waterWidth, waterHeight, null);

g.dispose();

// 生成输出的图片的文件
try {
FileOutputStream out = new FileOutputStream(newPicturePath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
param.setQuality(1, true);
encoder.encode(bimage, param);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}

// 测试

public static void main(String[] args) {
WaterMask("d:/1.jpg", "d:/2.jpg", "d:/water.jpg");
}

}