Java 圖片加文字水印以及圖片水印 水印位置可選

package com.product.utils;

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

import org.apache.commons.lang.StringUtils;

import javax.imageio.ImageIO;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;


@SuppressWarnings("restriction")
public final class ImageUtil {

    /**
     * 給圖片+圖片水印
     *
     * @param url       --url 地址
     * @param pressImg  -- 水印圖片
     * @param targetImg -- 目標文件
     * @param location  水印位置：left-top：左上角，right-top：右上角，left-bottom：左下角，right-bottom：右下角
     * @param degree    水印旋轉角度
     */

	public static void pressImage(String url, String pressImg, String targetImg, String location, Integer degree) {
        try {
            // 目標文件
            File _file = toFile(url, new File(targetImg));
            Image src = ImageIO.read(_file);
            int width = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = image.createGraphics();
            g.drawImage(src, 0, 0, width, height, null);
            // 水印文件
            File _filebiao = new File(pressImg);
            Image src_biao = ImageIO.read(_filebiao);
            int width_biao = src_biao.getWidth(null);
            int height_biao = src_biao.getHeight(null);
            // 水印座標
            int x = 0, y = 0;
            if (StringUtils.equals(location, "left-top")) {
                x += 30;
                y += 30;
            } else if (StringUtils.equals(location, "right-top")) {
                x = width - width_biao - 30;
                y += 30;
            } else if (StringUtils.equals(location, "left-bottom")) {
                y = height - height_biao - 30;
                x += 30;
            } else if (StringUtils.equals(location, "right-bottom")) {
                x = width - width_biao - 30;
                y = height - height_biao - 30;
            } else {
                x = (width - width_biao) / 2;
                y = (height - height_biao) / 2;
            }
            if (null != degree) {
                // 設置水印旋轉
                g.rotate(Math.toRadians(degree), x, y);
            }
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.drawImage(src_biao, x, y, width_biao, height_biao, null);
            // 水印文件結束
            g.dispose();
            //直接修改源文件
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.flush();
            out.close();
            //生成新的文件
            //File sf = new File("D:/imgout/" + "test" + "." + "jpg");
            //ImageIO.write(image, "jpg", sf); // 保存圖片
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 給圖片加文字水印
     *
     * @param url       圖片的網絡地址
     * @param pressText s水印文字
     * @param targetImg 目標文件
     * @param fontName  字體名稱
     * @param fontStyle 字體風格
     * @param fontSize  字體大小
     * @param location  字體位置:left-top：左上角，right-top：右上角，left-bottom：左下角，right-bottom：右下角
     */

	public static void pressText(String url, String pressText, String targetImg, String fontName, int fontStyle,
                                 int fontSize, String location,Color color) {
        try {

            int textWidth = getFontWidth(fontName, fontStyle, fontSize, pressText);
            //File _file = new File(targetImg);
            File _file = toFile(url, new File(targetImg));
            Image src = ImageIO.read(_file);
            int width = src.getWidth(null);
            int height = src.getHeight(null);
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = image.createGraphics();
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.drawImage(src.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
            g.setColor(color);
            g.setFont(new Font(fontName, fontStyle, fontSize));
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,
                    0.45f));
            int x = 0, y = 0;
            if (StringUtils.equals(location, "left-top")) {
                x = 30;
                y = 30;
            } else if (StringUtils.equals(location, "right-top")) {
                x = width - textWidth - 30;
                y = 30;
            } else if (StringUtils.equals(location, "left-bottom")) {
                x += 30;
                y = height - 30;
            } else if (StringUtils.equals(location, "right-bottom")) {
                x = width - textWidth - 30;
                y = height - 30;
            } else {
                x = (width - textWidth) / 2;
                y = (height) / 2;
            }
            g.drawString(pressText, x, y);
            g.dispose();
            FileOutputStream out = new FileOutputStream(targetImg);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(image);
            out.flush();
            out.close();

        } catch (IOException e) {
            e.printStackTrace();
        }


    }


    /**
     * 文件保存
     *
     * @param link 圖片連接
     * @param file 存入的文件地址
     * @return 下載的文件
     */
    public static File toFile(String link, File file) {
        try {

            URL url = new URL(link);
            URLConnection uri = url.openConnection();
            //獲取數據流
            InputStream ins = uri.getInputStream();
            OutputStream os = new FileOutputStream(file);
            int bytesRead = 0;
            byte[] buffer = new byte[8192];
            while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            ins.close();
            return file;
        } catch (Exception e) {
            return null;
        }

    }

    /**
     * 計算文本佔用的width
     *
     * @param fontName  字體名稱
     * @param fontStyle 字體風格
     * @param fontSize  字體大小
     * @param pressText 輸入文本
     * @return 文字所佔用的寬帶
     */
	public static int getFontWidth(String fontName, int fontStyle, int fontSize, String pressText) {
        Font f = new Font(fontName, fontStyle, fontSize);
        FontMetrics fm = sun.font.FontDesignMetrics.getMetrics(f);
        // 高度  
        //System.out.println(fm.getHeight());
        // 單個字符寬度  
        //System.out.println(fm.charWidth('A'));
        // 整個字符串的寬度  
        //System.out.println(fm.stringWidth(pressText));
        return fm.stringWidth(pressText);


    }


    public static void main(String[] args) {
        //pressImage("https://cbu01.alicdn.com/img/ibank/2017/041/711/4771117140_1239574879.jpg", "D:/imgin/20181017110944.png", "D:/imgout/x2.jpg", "left-bottom", null);//
        //pressImage("D:/imgin/20181017110944.png", "D:/imgout/1.png", "right-top", null);
        //pressImage("D:/imgin/20181017110944.png", "D:/imgout/1.png", "center", null);
        //pressImage("D:/imgin/20181017110944.png", "D:/imgout/1.png", "left-bottom", null);
        //pressImage("D:/imgin/20181017110944.png", "D:/imgout/1.png", "right-bottom", null);
        //pressText("https://cbu01.alicdn.com/img/ibank/2017/041/711/4771117140_1239574879.jpg", "miraclad發送到發燒是打發打發esgrocery", "D:/imgout/r1.jpg", "黑體", Font.BOLD + Font.ITALIC, 30, "right-top",Color.GRAY);
        //getFontWidth("黑體", Font.BOLD + Font.ITALIC, 30, "miraclesgrocery");
    	//System.out.println(Color.RED);
    	//System.out.println(Color.WHITE);
    	//System.out.println(Color.GRAY);
    }


}