给图片加水印

package com.tryitsoft.image;

import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.*;
import com.sun.image.codec.jpeg.*;

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 boolean 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/5,height/5); //添加文字
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 false; }
return true;
}
}