转换图片格式 尺寸

    Image srcImg = ImageIO.read(file);
    BufferedImage buffImg = null;
    buffImg = new BufferedImage(50, 50, BufferedImage.TYPE_INT_RGB);  
    buffImg.getGraphics().drawImage(srcImg.getScaledInstance(50, 50, Image.SCALE_SMOOTH), 0, 0, null);
    ImageIO.write(buffImg, "gif", new File("C:/logs/submit_50x50.gif"));