1 import java.awt.AlphaComposite;
2 import java.awt.Graphics2D;
3 import java.awt.image.BufferedImage;
4 import java.io.File;
5 import java.io.IOException;
6
7 import javax.imageio.ImageIO;
8 public class NewImageUtils {
9 /**
10 *
11 * @Title: 构造图片
12 * @Description: 生成水印并返回java.awt.image.BufferedImage
13 * @param file
14 * 源文件(图片)
15 * @param waterFile
16 * 水印文件(图片)
17 * @param x
18 * 距离右下角的X偏移量
19 * @param y
20 * 距离右下角的Y偏移量
21 * @param alpha
22 * 透明度, 选择值从0.0~1.0: 完全透明~完全不透明
23 * @return BufferedImage
24 * @throws IOException
25 */
26 public static BufferedImage watermark(File file, File waterFile,
int x,
int y,
float alpha)
throws IOException {
27 // 获取底图
28 BufferedImage buffImg =
ImageIO.read(file);
29 // 获取层图
30 BufferedImage waterImg =
ImageIO.read(waterFile);
31 // 创建Graphics2D对象，用在底图对象上绘图
32 Graphics2D g2d =
buffImg.createGraphics();
33 int waterImgWidth = waterImg.getWidth();
// 获取层图的宽度
34 int waterImgHeight = waterImg.getHeight();
// 获取层图的高度
35 // 在图形和图像中实现混合和透明效果
36 g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
37 // 绘制
38 g2d.drawImage(waterImg, x, y, waterImgWidth, waterImgHeight,
null);
39 g2d.dispose();
// 释放图形上下文使用的系统资源
40 return buffImg;
41 }
42
43 /**
44 * 输出水印图片
45 *
46 * @param buffImg
47 * 图像加水印之后的BufferedImage对象
48 * @param savePath
49 * 图像加水印之后的保存路径
50 */
51 private void generateWaterFile(BufferedImage buffImg, String savePath) {
52 int temp = savePath.lastIndexOf(".") + 1
;
53 try {
54 ImageIO.write(buffImg, savePath.substring(temp),
new File(savePath));
55 }
catch (IOException e1) {
56 e1.printStackTrace();
57 }
58 }
59
60 /**
61 *
62 * @param args
63 * @throws IOException
64 * IO异常直接抛出了
65 * @author bls
66 */
67 public static void main(String[] args)
throws IOException {
68 String sourceFilePath = "D://img//di.png"
;
69 String waterFilePath = "D://img//ceng.png"
;
70 String saveFilePath = "D://img//new.png"
;
71 NewImageUtils newImageUtils =
new NewImageUtils();
72 // 构建叠加层
73 BufferedImage buffImg = NewImageUtils.watermark(
new File(sourceFilePath),
new File(waterFilePath), 0, 0, 1.0f
);
74 // 输出水印图片
75 newImageUtils.generateWaterFile(buffImg, saveFilePath);
76 }
77 }
转载于:https://www.cnblogs.com/bilaisheng/p/5500223.html
