java 图片加水印

import javax.imageio.ImageIO;
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;

public class WaterMark {

/**
* @param srcImgPath 源图片路径
* @param tarImgPath 保存的图片路径
* @param waterMarkContent 水印内容
* @param markContentColor 水印颜色
* @param font 水印字体
*/
public void addWaterMark(String srcImgPath, String tarImgPath, String waterMarkContent, Color markContentColor, Font font) {

try {
// 读取原图片信息
File srcImgFile = new File(srcImgPath);//得到文件
Image srcImg = ImageIO.read(srcImgFile);//文件转化为图片
int srcImgWidth = srcImg.getWidth(null);//获取图片的宽
int srcImgHeight = srcImg.getHeight(null);//获取图片的高
// 加水印
BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bufImg.createGraphics();
g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
g.setColor(markContentColor); //根据图片的背景设置水印颜色
g.setFont(font);              //设置字体

//设置水印的坐标
int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 10;
int y = srcImgHeight - 10;
g.drawString(waterMarkContent, x, y);  //画出水印
g.dispose();
// 输出图片
FileOutputStream outImgStream = new FileOutputStream(tarImgPath);
ImageIO.write(bufImg, "jpg", outImgStream);
System.out.println("添加水印完成");
outImgStream.flush();
outImgStream.close();

} catch (Exception e) {
// TODO: handle exception
}
}
public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
}
public static void main(String[] args) {
Font font = new Font("微软雅黑", Font.PLAIN, 60);                     //水印字体
String srcImgPath="C://Users//pactera//Desktop//exe/333.jpg"; //源图片地址
String tarImgPath="C://Users//pactera//Desktop//exe/444.jpg"; //待存储的地址
String waterMarkContent="图片来源：随手而来";  //水印内容
Color color=new Color(255,255,255,128);                               //水印图片色彩以及透明度
new WaterMark().addWaterMark(srcImgPath, tarImgPath,waterMarkContent, color ,font);

}

}