import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
 * JAVA 畫圖(生成文字水印)
 * 
 * @author 杰寶寶
 * 
 */
public class ImageUtil {
    /**
     * @param str
     *            生產(chǎn)的圖片文字
     * @param oldPath
     *            原圖片保存路徑
     * @param newPath
     *            新圖片保存路徑
     * @param width
     *            定義生成圖片寬度
     * @param height
     *            定義生成圖片高度
     * @return
     * @throws IOException
     */
    public void create(String str, String oldPath, String newPath, int width, int height){
        try {
            File oldFile = new File(oldPath);
            Image image = ImageIO.read(oldFile);
            File file = new File(newPath);
            BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = bi.createGraphics();
            g2.setBackground(Color.WHITE);
            g2.clearRect(0, 0, width, height);
            g2.drawImage(image, 0, 0, width - 25, height - 25, null); //這里減去25是為了防止字和圖重合
            /** 設(shè)置生成圖片的文字樣式 * */
            Font font = new Font("黑體", Font.BOLD, 25);
            g2.setFont(font);
            g2.setPaint(Color.BLACK);
            /** 設(shè)置字體在圖片中的位置 在這里是居中* */
            FontRenderContext context = g2.getFontRenderContext();
            Rectangle2D bounds = font.getStringBounds(str, context);
            double x = (width - bounds.getWidth()) / 2;
            //double y = (height - bounds.getHeight()) / 2; //Y軸居中
            double y = (height - bounds.getHeight());
            double ascent = -bounds.getY();
            double baseY = y + ascent;
            /** 防止生成的文字帶有鋸齒 * */
            g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            /** 在圖片上生成文字 * */
            g2.drawString(str, (int) x, (int) baseY);
            ImageIO.write(bi, "jpg", file);
        } catch (IOException e) {
            e.printStackTrace();
        } 
    }
    public static void main(String[] args) {
        try {
            ImageUtil img = new ImageUtil();
            img.create("編號：0011", "E:\\111.png", "E:\\222.png", 455, 455);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

package com.gupaoedu.vip.test; 
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream; 
public class watermark { 
 
    /**
     * 給圖片添加水印
     */
    public void addWaterMark() {
 
        Color color = new Color(255, 200, 0, 118);   // 水印顏色
        Font font = new Font("微軟雅黑", Font.ITALIC, 45);  //水印字體
        String waterMarkContent="我愛你 I LOVE YOU";   //水印內(nèi)容
        String tarImgPath = "C:\\Users\\yun\\Desktop\\新建文件夾\\timg2.jpg";  //存儲目標(biāo)路徑
        try {
            File file = new File("C:\\Users\\yun\\Desktop\\新建文件夾\\timg.jpg");  //原圖片
            BufferedImage buImage = ImageIO.read(file);
            int width = buImage.getWidth(); //圖片寬
            int height = buImage.getHeight(); //圖片高
 
            //添加水印
            BufferedImage bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
            Graphics2D g = bufferedImage.createGraphics();
            g.drawImage(buImage, 0, 0, width, height, null);
            g.setColor(color); //水印顏色
            g.setFont(font); //水印字體
 
            int x = width -2*getWatermarkLength(waterMarkContent, g);  //這是一個(gè)計(jì)算水印位置的函數(shù)，可以根據(jù)需求添加
            int y = height - 1*getWatermarkLength(waterMarkContent, g);
            g.drawString(waterMarkContent, 400, 300); //水印位置
            g.dispose(); //釋放資源
 
            FileOutputStream outImgStream = new FileOutputStream(tarImgPath);
            ImageIO.write(bufferedImage, "jpg", outImgStream);
            System.out.println("添加水印完成");
            outImgStream.flush();
            outImgStream.close();
 
 
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public int getWatermarkLength(String waterMarkContent, Graphics2D g) {
        return g.getFontMetrics(g.getFont()).charsWidth(waterMarkContent.toCharArray(), 0, waterMarkContent.length());
    }
    public static void main(String[] args) {
        new watermark().addWaterMark();
    }
}