图片处理（水印，Base64转图片）

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Base64格式转图片

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    public static boolean Base64ToImage(String imgStr) throws WxException {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
        String string = sdf.format(date);
        //图片存放路径
        String filePath = "D:" + File.separator + string;
        File file = new File(filePath);
        //判断文件是否存在
        if (!file.exists()) {
            file.mkdir();
        }
        //图片名称
        Long lg = System.currentTimeMillis();
        String imageName = lg + ".jpg";
        //图片存放路径
        String imagePath = filePath + File.separator + imageName;
        if (imgStr == null) {
            throw new WxException("图片base64编码数据为空");
        }
        BASE64Decoder decoder = new BASE64Decoder();
        try {
// 解密
            byte[] b = decoder.decodeBuffer(imgStr);
// 处理数据
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            OutputStream out = new FileOutputStream(imagePath);
            out.write(b);
            out.flush();
            out.close();
            return true;
        } catch (Exception e) {
            throw new WxException("图片base64格式转换图片失败。");
        }
    }


图片增加图片水印处理

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 public static String watermark(File image) throws Exception {
//        String logoFileName = "logo_"+image.getOriginalFilename();
        OutputStream os = null;

        try {
            Image image2 = ImageIO.read(image);
            int width = image2.getWidth(null);
            int height = image2.getHeight(null);

//            1、创建缓存图片对象
            BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

//            2、        创建JAVA绘图工具对象
            Graphics2D graphics2D = bufferedImage.createGraphics();

//            3、使用绘图工具对象，将原图绘制到缓存图片对象
            graphics2D.drawImage(image2, 0, 0, width, height, null);

//            4、使用绘图工具，将水印（文字/图片）绘制到缓存图片对象Logo为水印图片

            File logo = ResourceUtils.getFile(ResourceUtils.CLASSPATH_URL_PREFIX + "static/shuiyin.png");

//            File logo = new File(logoPath);
            Image imageLogo = ImageIO.read(logo);
            int width1 = imageLogo.getWidth(null);
            int height1 = imageLogo.getHeight(null);
            ////设置水印 ALPHA大小
            graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.3F));
            graphics2D.rotate(Math.toRadians(30), bufferedImage.getHeight() / 2, bufferedImage.getHeight() / 2);//图层以中心为基点，转30度的弧度。
            int x = -width / 2;
            int y = -height / 2;
            while (x < width * 1.5) {
                y = -height / 2;
                while (y < height * 1.5) {
                    graphics2D.drawImage(imageLogo, x, y, null);
                    //MARGIN_ALL 边缘参数
                    y += height1 + 50;
                }
                x += width1 + 50;
            }
            graphics2D.dispose();
//            5、        创建图像编码工具类 指定地址
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            String string = sdf.format(date);

            // realUploadPath + File.separator + image.getName();
            String des = "D:" + File.separator + "workCatalog" + File.separator + string + File.separator;
            File file = new File(des);
            if (!file.exists()) {
                file.mkdirs();
            }
            String watermarkPaht = "D:" + File.separator + "workCatalog" + File.separator + string + File.separator + image.getName();
            //C:\Users\Tanghaiwen\AppData\Local\Temp\tomcat-docbase.4840919478909796944.8083\images\logo_1.jpg
            os = new FileOutputStream(watermarkPaht);
            JPEGImageEncoder jpegImageEncoder = JPEGCodec.createJPEGEncoder(os);
//            6、使用图片编码工具类，输出缓存图像到模板图片文件
            jpegImageEncoder.encode(bufferedImage);
            return des;
        } catch (Exception e) {
            e.printStackTrace();
            throw new WxException("图片水印处理失败");
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new WxException("图片水印处理失败");
                }
            }
        }

    }


图片增加文字水印处理

注：和图片文印一样,文字水印未经测试(若有问题就用上面的走一遍即可)

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    public String watermark(File image) {
        OutputStream os = null;
    
        try {
            Image image2 = ImageIO.read(image);
            int width = image2.getWidth(null);
            int height = image2.getHeight(null);

//            1、创建缓存图片对象
            BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

//            2、        创建JAVA绘图工具对象
            Graphics2D graphics2D = bufferedImage.createGraphics();

//            3、使用绘图工具对象，将原图绘制到缓存图片对象
            graphics2D.drawImage(image2, 0, 0, width, height, null);

//            4、使用绘图工具，将水印（文字/图片）绘制到缓存图片对象
            graphics2D.setFont(new Font("微软雅黑", Font.BOLD, 30));
            graphics2D.setColor(Color.RED);

            //S1-获取文字水印的宽、高
            int width1 = 30 * getTextLength("水印文字");
            int height1 = 30;
    
            int widthDiff = width - width1;
            int heightDiff = height - height1;
    
            int x = 10;
            int y = 10;
            if (x > widthDiff) {
                x = widthDiff;
            }
            if (y > heightDiff) {
                y = heightDiff;
            }
            graphics2D.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.3F));//设置水印
            graphics2D.drawString("水印文字", x, y + 30);//x:横坐标，y:纵坐标
            graphics2D.dispose();

//            5、  创建图像编码工具类
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            String string = sdf.format(date);

            // realUploadPath + File.separator + image.getName();
            String des = "D:" + File.separator + "workCatalog" + File.separator + string + File.separator;
            File file = new File(des);
            if (!file.exists()) {
                file.mkdirs();
            }
            String watermarkPaht = "D:" + File.separator + "workCatalog" + File.separator + string + File.separator + image.getName();
            os = new FileOutputStream(des);
    
            JPEGImageEncoder jpegImageEncoder = JPEGCodec.createJPEGEncoder(os);

//            6、使用图片编码工具类，输出缓存图像到模板图片文件
            jpegImageEncoder.encode(bufferedImage);
            return des;
        } catch (Exception e) {
            e.printStackTrace();
            throw new WxException("图片水印处理失败");
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    throw new WxException("图片水印处理失败");
                }
            }
        }
    }