java给图片添加水印

package com.blue.common.util;

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 java.io.IOException;

import javax.imageio.ImageIO;


public class WaterMarkUtils {
/**
* 图片添加水印
* @param srcImgPath 需要添加水印的图片的路径
* @param outImgPath 添加水印后图片输出路径
* @param markContentColor 水印文字的颜色
* @param waterMarkContent 水印的文字
*/
public static void mark(String srcImgPath, String outImgPath, Color markContentColor, String waterMarkContent) {
FileOutputStream outImgStream =null;
try {
// 读取原图片信息
File srcImgFile = new File(srcImgPath);
Image srcImg = ImageIO.read(srcImgFile);
int srcImgWidth = srcImg.getWidth(null);
int srcImgHeight = srcImg.getHeight(null);
// 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);
Font font = new Font("黑体", Font.ITALIC, 30);
g.setColor(markContentColor); //根据图片的背景设置水印颜色

g.setFont(font);
int x = srcImgWidth - getWatermarkLength(waterMarkContent, g) - 3;
int y = srcImgHeight - 3;
//int x = (srcImgWidth - getWatermarkLength(watermarkStr, g)) / 2;
//int y = srcImgHeight / 2;
g.drawString(waterMarkContent, x, y);
g.dispose();
// 输出图片
outImgStream = new FileOutputStream(outImgPath);
ImageIO.write(bufImg, "jpg", outImgStream);
outImgStream.flush();
outImgStream.close();
} catch (Exception e) {
e.printStackTrace();
}finally{
if(outImgStream!=null){
try {
outImgStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

/**
* 获取水印文字总长度
* @param waterMarkContent 水印的文字
* @param g
* @return 水印文字总长度
*/
public static int getWatermarkLength(String waterMarkContent, Graphics2D g) {
return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
}

public static void main(String[] args) {
// 原图位置, 输出图片位置, 水印文字颜色, 水印文字
mark("D:/999/A01.jpg", "d:/A01.jpg", Color.BLACK, "QSR水印效果测试");
}
}