图片叠加_图片压缩

图片叠加

try {
            /* 1 读取第一张图片*/
            File fileOne = new File("1.png");
            BufferedImage imageFirst = ImageIO.read(fileOne);
            /* 2读取第二张图片 */
            File fileTwo = new File("2.png");
            BufferedImage imageSecond = ImageIO.read(fileTwo);
			//创建一个最底层画布 高和宽为第一章图片的高和宽
            BufferedImage image = new BufferedImage(imageFirst.getWidth(),imageFirst.getHeight(),BufferedImage.TYPE_INT_ARGB);
            //通过底图创建画笔
            Graphics graphics = image.getGraphics();
            //在底图上画第一张图
            graphics.drawImage(imageFirst,0,0,null);
            //在底图上画第二张图  参数: 图片, x轴坐标, y轴坐标, null 
            graphics.drawImage(imageSecond,0,0,null);
            //在图片上写文字
            graphics.drawString("i am a str", 10, 30);
			//输出图片
            File outFile = new File("out.png");
            ImageIO.write(image, "png", outFile);
        } catch (Exception e) {
            e.printStackTrace();
        }

图片叠加示例:

图片压缩

    /**
     * 图片压缩
     *
     * @param imgsrc     原图地址
     * @param imgdist    压缩后地址
     * @param widthdist  宽
     * @param heightdist 高
     */
    public static void reduceImg(String imgsrc, String imgdist, int widthdist, int heightdist) {
        try {
            File srcfile = new File(imgsrc);
            if (!srcfile.exists()) {
                return;
            }
            Image src = javax.imageio.ImageIO.read(srcfile);
            BufferedImage tag = new BufferedImage((int) widthdist, (int) heightdist, BufferedImage.TYPE_INT_RGB);
            tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_SMOOTH), 0, 0, null);
//            tag.getGraphics().drawImage(src.getScaledInstance(widthdist, heightdist, Image.SCALE_AREA_AVERAGING), 0, 0, null);
            FileOutputStream out = new FileOutputStream(imgdist);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(tag);
            out.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        reduceImg("out.png", "111.png", 300, 300);
    }

图片压缩示例
压缩前

压缩后