一个背景图片，一个二维码图片
将两个图片合并成一个图片。
写了一个工具类，需要的朋友自取。
1 @Component
2 public class PictureUtil {
3 /**
4 * @param file1Src 在线图片地址1
5 * @param file2Src 在线图片地址2
6 * @param response
7 * @param x
8 * @param y
9 */
10 public void composePic(String file1Src, String file2Src, Integer x, Integer y, HttpServletResponse response) {
11 try {
12 java.net.URL url = new java.net.URL(file1Src);
13 URLConnection conn = url.openConnection();
14 InputStream bgFile = conn.getInputStream();
15 Image bgSrc = javax.imageio.ImageIO.read(bgFile);
16
17 url = new java.net.URL(file2Src);
18 conn = url.openConnection();
19 InputStream logoFile = conn.getInputStream();
20 Image logoSrc = javax.imageio.ImageIO.read(logoFile);
21
22 int bgWidth = bgSrc.getWidth(null);
23 int bgHeight = bgSrc.getHeight(null);
24 int logoWidth = logoSrc.getWidth(null);
25 int logoHeight = logoSrc.getHeight(null);
26
27 BufferedImage tag = new BufferedImage(bgWidth, bgHeight, BufferedImage.TYPE_INT_RGB);
28
29 Graphics2D g2d = tag.createGraphics();
30 g2d.drawImage(bgSrc, 0, 0, bgWidth, bgHeight, null);
31 g2d.drawImage(logoSrc, x, y, logoWidth, logoHeight, null);
32
33 ImageIO.write(tag, "png", response.getOutputStream());
34 } catch (Exception e) {
35 e.printStackTrace();
36 }
37 }
38 }
参考：
Java后台通过IO流将文件返回至前端进行预览
