java生成图片，添加水印

ゝ一纸荒年。 2023-02-15 12:50 2阅读 0赞

private static final String URL = "D:/test/template.png";
    
    public static String certificateBuilder(String nickname, BigDecimal totalAmount) {
    
            //得到图片缓冲区
            FileInputStream fileInputStream = null;
            String savePath = "";
            try {
                File file = new File(URL);
    
                if (!file.exists()) {
                    log.info("模板不存在");
                } else {
                    fileInputStream = new FileInputStream(file);
                    BufferedImage image = ImageIO.read(fileInputStream);
                    BufferedImage image2 = ImageIO.read(new File("D:/test/stamp.png"));
                    //获取图片的宽
                    int width = image.getWidth(null);
                    //获取图片的高
                    int height = image.getHeight(null);
                    log.info("模板位置：{}.宽：{}.高：{}.", URL, width, height);
    
                    //初始化画板
                    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                    //得到它的绘制环境
                    Graphics2D g2 = (Graphics2D) bi.getGraphics();
                    g2.fillRect(0, 0, width, height);
                    //设置颜色
                    g2.setColor(Color.WHITE);
                    // 将图片大小设置为大约4cm*4cm 具体根据纸张大小设定
                    g2.drawImage(image, 0, 0, width, height, null);
                    g2.drawRect(0, 0, width, height);
    
    
                    g2.setFont(new Font("微软雅黑", Font.PLAIN, 30));
                    g2.setColor(Color.gray);
                    g2.drawString("证书编号：H11111122222233333", 315, 410);
    
                    //设置背景颜色
                    g2.setColor(Color.BLACK);
                    //向图片上写字符串
                    g2.setFont(new Font("微软雅黑", Font.PLAIN, 42));
                    g2.drawString("大慈善家", 320, 570);
                    g2.setFont(new Font("微软雅黑", Font.PLAIN, 42));
                    g2.drawString("2020年9月20日", 720, 1330);
                    g2.setFont(new Font("微软雅黑", Font.PLAIN, 42));
                    g2.setColor(Color.RED);
                    g2.drawString("5.12元", 450, 1030);
    
                    //盖章
                    g2.drawImage(image2, 810, 1174, image2.getWidth(null), image2.getHeight(null), null);
    
                    // 合成图片
                    StringBuffer path = new StringBuffer();
                    path.append("D:/test/");
                    path.append(UUIDUtils.gen());
                    path.append("-");
                    path.append(nickname);
                    path.append(".png");
    
                    boolean bool = ImageIO.write(bi, "PNG", new FileOutputStream(path.toString()));
                    log.info("结果：{}.", bool);
                    if (bool) {
                        savePath = path.toString();
                    }
                }
            } catch (Exception e) {
                log.error("生成图片错误", e);
            } finally {
                //关流
                if (fileInputStream != null) {
                    try {
                        fileInputStream.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                return savePath;
            }
        }