java程序向图片上加水印

import java.awt.Color;
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 WaterMark {
/**
* 给图片添加水印
*
* @param filePath
* 需要添加水印的图片的路径
* @param markContent
* 水印的文字
* @param markContentColor
* 水印文字的颜色
* @param qualNum
* 图片质量
* @return
*/
public void createMark(String filePath, String markContent,
Color markContentColor, float qualNum) {

ImageIcon imgIcon = new ImageIcon(filePath);
Image theImg = imgIcon.getImage();
int width = theImg.getWidth(null);
int height = theImg.getHeight(null);
BufferedImage bimage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);

Graphics2D g = bimage.createGraphics();
g.setColor(markContentColor);
g.setBackground(Color.white);
g.drawImage(theImg, 0, 0, null);
g.drawString(markContent, width / 3, height / 2); // 添加水印的文字和设置水印文字出现的内容
g.dispose();

try {
FileOutputStream out = new FileOutputStream(filePath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
param.setQuality(qualNum, true);
encoder.encode(bimage, param);
out.close();

} catch (Exception e) {
return ;
}
}

public static void main(String[] args) {
WaterMark wm = new WaterMark();

wm.createMark("d://map.jpg","http://www.163.com",Color.WHITE,70f);
}
}