图片水印

package com.freeter.util;

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

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;

    public class WaterYin {
        /**
         * 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 false;
            }
            return true;
        }

    }