【Java】图片添加水印及水印文字的操作

添加文字水印

package pers.io;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;

/**
 * 水印添加
 * 
 * @author three
 *
 */
public class Watermark {

    public static void main(String[] args) {
        mark1();
        mark2();
        mark3();
    }

    /**
     * 方法（一）
     * 系统自带字体
     */
    public static void mark1() {
        try {
            BufferedImage src = ImageIO.read(new File("d:/01.jpg"));
            Graphics2D g = src.createGraphics();
            // 抗锯齿
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            // 设置字体
            Font font = new Font("隶书", Font.BOLD, 30);
            g.setFont(font);

            String str = "three 205024319";
            int x = 10;
            int y = 40;
            g.drawString(str, x, y);
            g.dispose();

            ImageIO.write(src, "jpg", new FileOutputStream("d:/mark.jpg"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    /**
     * 方法（二）
     * 装载外部字体
     */
    public static void mark2() {
        try {
            BufferedImage src = ImageIO.read(new File("d:\mark.jpg"));
            Graphics2D g = src.createGraphics();
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

            //设置字体，使用下载的字体
            Font font = Font.createFont(Font.TRUETYPE_FONT, new File("f:\download\font_1.ttf"));
            Font ff = font.deriveFont(Font.PLAIN, 30f);
            g.setFont(ff);

            String str = "版权所有 205024319";
            int x = 10;
            int y = 80;
            g.drawString(str, x, y);
            g.dispose();

            ImageIO.write(src, "jpg", new FileOutputStream("d:\mark.jpg"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 字体定位（水印位置）
     */
    public static void mark3() {
        try {
            BufferedImage src = ImageIO.read(new File("d:\01.jpg"));
            int iw = src.getWidth();
            int ih = src.getHeight();

            Graphics2D g = src.createGraphics();
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

            Font font = new Font("", Font.ITALIC, 30);
            g.setFont(font);

            String str = "three 205024319";
            FontMetrics fm = g.getFontMetrics();
            int fw = fm.stringWidth(str);
            int fh = fm.getHeight();

            // 左上角
            int x = 0;
            int y = fh;
            g.setColor(Color.WHITE);
            g.drawString(str, x, y);

            // 右下角
            x = iw - fw;
            y = ih;
            g.drawString(str, x, y);

            // 中心
            x = (iw - fw) / 2;
            y = ih / 2;
            g.drawString(str, x, y);

            // 随机位置
            g.setColor(Color.BLUE);
            for (int i = 0; i <= 5; i++) {
                Random rand = new Random();
                x = rand.nextInt(iw - fw);
                y = rand.nextInt(ih - fh) + fh;
                g.drawString(str, x, y);
            }

            g.dispose();

            ImageIO.write(src, "jpg", new FileOutputStream("d:\markPlus.jpg"));
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

添加图片水印

    /**
     * 图片水印
     */
    public static void imgMark(File file) {
        try {
            BufferedImage i = ImageIO.read(file);
            int iw = i.getWidth();
            int ih = i.getHeight();
            
            //选择要添加的logo
            BufferedImage logo = ImageIO.read(new File("d:\logo.png"));
            int lw = logo.getWidth();
            int lh = logo.getHeight();
            
            Graphics2D g = i.createGraphics();
            //右下角位置
            g.drawImage(logo, iw-lw-10,ih-lh-10, null);
            g.dispose();
            
            ImageIO.write(i, file.getName().substring(file.getName().lastIndexOf(".")+1), new FileOutputStream(file));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }