java处理图片加水印文字和缩略图

class SpringbootWatermarkApplicationTests {

    public static void main(String[] args) {
        SpringbootWatermarkApplicationTests springbootWatermarkApplicationTests = new SpringbootWatermarkApplicationTests();
        String realPath = "C:/Users/Administrator/Desktop/ceshitupian";
        String sourceImg = realPath+"/66.jpg";
        String targetImg = realPath+"/66-11.jpg";;
        String watermarkTime = "2021-10-21";
        String watermarkAddress = "北京世纪城";
        Color color = Color.RED;
        try {
            springbootWatermarkApplicationTests.addNewWatermark(sourceImg,targetImg,watermarkTime,watermarkAddress,color);
            File image = new File(sourceImg);
            String dest = realPath + "/suluetu.jpg";
            springbootWatermarkApplicationTests.thumbnailImage(image, 50, 50, dest);

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

    
    public void addNewWatermark(String sourceImg, String targetImg, String watermarkTime, String watermarkAddress,
                                Color color) throws IOException {
        File srcImgFile = new File(sourceImg);
        Image srcImg = ImageIO.read(srcImgFile);
        int srcImgWidth = srcImg.getWidth(null);
        int srcImgHeight = srcImg.getHeight(null);
        BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bufImg.createGraphics();
        g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
        g.setColor(color);
        int fontSize = srcImgWidth / 300 * 10;
        Font font = new Font("04b_08", Font.PLAIN, fontSize);//字体
        g.setFont(font);
        //设置水印的坐标
        int x = srcImgWidth ;
        int y = srcImgHeight - fontSize;
        g.drawString(watermarkAddress, 0, y);  //加水印

        int ys = srcImgHeight - 2 * fontSize;
        g.drawString(watermarkTime, 0, ys);  //加水印
        g.dispose();

        File sf = new File(targetImg);
        ImageIO.write(bufImg, "jpg", sf);
        System.out.println("添加水印完成");
    }

    
    public static void thumbnailImage(File imgFile, int w,int h,String dest)throws Exception{
        // ImageIO 支持的图片类型 : [BMP, bmp, jpg, JPG, wbmp, jpeg, png, PNG, JPEG, WBMP, GIF, gif]
        String suffix = null;
        // 获取图片后缀
        if(imgFile.getName().indexOf(".") > -1) {
            suffix = imgFile.getName().substring(imgFile.getName().lastIndexOf(".") + 1);
        }
        Image img = ImageIO.read(imgFile);
        // 根据原图与要求的缩略图比例，找到最合适的缩略图比例
        int width = img.getWidth(null);
        int height = img.getHeight(null);
        if((width*1.0)/w < (height*1.0)/h){
            if(width > w){
                h = Integer.parseInt(new java.text.DecimalFormat("0").format(height * w/(width*1.0)));
            }
        } else {
            if(height > h){
                w = Integer.parseInt(new java.text.DecimalFormat("0").format(width * h/(height*1.0)));
            }
        }
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.getGraphics();
        g.drawImage(img, 0, 0, w, h, Color.LIGHT_GRAY, null);
        g.dispose();
        // 将图片保存在原目录并加上前缀
        ImageIO.write(bi, suffix, new File(dest));
    }
}