给图片左上角加logo标识、左下角加时间和地址、地址到达指定长度换行

效果

1.给照片添加logo水印

(1)添加pom依赖

<dependency>
	<groupId>net.coobird</groupId>
	<artifactId>thumbnailator</artifactId>
	<version>0.4.8</version>
</dependency>

 /** * 给照片添加Logo水印 * @param projectPath 项目路径 * @param finalImageWater 加上水印后台图片存储地址 * @throws Exception */
    private void addWaterLogoImage(String projectPath, String finalImageWater) throws Exception{
    
        //读取原图，获取宽高
        File file = new File(projectPath + "/WEB-INF/template/image.jpg");
        BufferedImage image = ImageIO.read(file);
        //读取水印图
        BufferedImage waterImg = ImageIO.read(new File(projectPath + "/WEB-INF/template/雨虹logo.jpg"));
        double bl = 0.18;//水印为原图宽占比
        //根据比例计算新的水印图宽高
        int waterWidth = (int) (image.getWidth() * bl);
        int waterHeight = waterWidth * waterImg.getHeight() / waterImg.getWidth();
        waterImg = Thumbnails.of(waterImg).size(waterWidth, waterHeight).keepAspectRatio(false).asBufferedImage();
        //使用新水印执行添加水印操作 Positions.TOP_LEFT 将logo放到左上角
        Thumbnails.of(file).watermark(Positions.TOP_LEFT, waterImg, 1f).scale(1).toFile(finalImageWater);
    }

2.给照片添加时间、地址水印并实现地址过长换行效果

/** * 添加时间、地址水印 * @param finalImageWater */
    private void addWaterFontImage(String finalImageWater, String address) {
    
        try {
    
            String waterFont = "时 间："+ DateUtil.format(new Date(), "yyyy-MM-dd HH:mm:ss");
            address = "地 址:"+address;
            // 读取原图片信息
            File srcImgFile = new File(finalImageWater);
            Image srcImg = ImageIO.read(srcImgFile);
            int srcImgWidth = srcImg.getWidth(null);
            int srcImgHeight = srcImg.getHeight(null);

            // 初始化画布，图片多大，画布多大
            BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D g = bufImg.createGraphics();
            //指定要绘制的图片
            g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
            double fontLength = srcImgWidth * 0.3;//根据比例设置文字占的长度,即文字长度
            int fontSize = (int) (fontLength / 5 * 0.6);//文字大小，0.9为差值
            //设置字体样式，加粗，大小
            Font font = new Font("黑体", Font.BOLD, fontSize);
            //设置文字颜色
            g.setColor(Color.white);
            g.setFont(font);
            //绘制文字的横纵坐标
            /** * 控制换行 */
            ArrayList<String> line_list = new ArrayList<>();
            FontRenderContext frc = g.getFontRenderContext();
            g.getFontRenderContext();
            Rectangle2D stringBounds = font.getStringBounds(address, frc);
            double fontWidth = stringBounds.getWidth();
            if(fontWidth <= bufImg.getWidth()){
    
                line_list.add(address);
            }else {
    
                int text_width = bufImg.getWidth()-60;// 输出文本宽度, 这里就以画布宽度作为文本宽度测试
                double bs =  fontWidth/text_width ;// 文本长度是文本框长度的倍数
                int line_char_count = (int)Math.ceil(address.length() / bs) ;// 每行大概字数
                int begin_index = 0 ;
                while(begin_index <address.length()){
    
                    int end_index = begin_index + line_char_count ;
                    if(end_index>= address.length()){
    
                        end_index = address.length();
                    }
                    String line_str = address.substring(begin_index, end_index);
                    Rectangle2D tempStringBounds = font.getStringBounds(line_str, frc);
                    int tzcs = 0 ;// 调整次数
                    int tzzs = 1 ;// 调整字数, 临时文本的字符串长度大于要求的文本宽度时, 每次减少临时文本的字数, 然后重新测量文本宽度
                    while(tempStringBounds.getWidth()> text_width){
    
                        line_str = line_str.substring(0, line_str.length() - tzzs );// 每次向前 tzzs 个字符重新计算 (待优化)
                        tempStringBounds = font.getStringBounds(line_str, frc);
                        tzcs++;
                    }
                    System.out.println("调整"+(end_index - begin_index -line_str.length())+"个数字, 调整了"+tzcs+"次, 当前行宽度:"+tempStringBounds.getWidth());
                    line_list.add(line_str);
                    begin_index = begin_index + line_str.length()  ;
                }
            }
            int gao = 0;
            if(srcImgHeight > srcImgWidth){
    
                gao = 90;
            }else{
    
                gao = 100;
            }
            for(int i = 0;i<line_list.size();i++){
    
                if(i == 0){
    
                    //绘制时间水印
                    g.drawString(waterFont, 20, (i+(srcImgHeight/gao))*80);
                }
                String line_str = line_list.get(i);
                //绘制地址水印
                g.drawString(line_str, 20, (i+1+(srcImgHeight/gao))*80);//35 为每行的高度
            }
            g.dispose();
            // 输出图片
            Thumbnails.of(srcImgFile).watermark(Positions.BOTTOM_LEFT, bufImg, 1f).scale(1).toFile(finalImageWater);
        }catch (Exception e){
    
            e.printStackTrace();
        }
    }