Java实现图片类型转换_java 转换cgm图

	//常用类型
	public static final String TYPE_BMP = "bmp";
	public static final String TYPE_JPG = "jpg";
	public static final String TYPE_PNG = "png";
	public static final String TYPE_JEPG = "jepg";
	/**
	 * 
	 * @param oldPicture 原图片文件
	 * @param newPicture 新图片文件
	 * @param type	新图片的文件类型
	 * @return
	 * @throws IOException
	 */
	public static boolean pictureTransition(File oldPicture, File newPicture, String type) throws IOException{
		if(oldPicture == null) {
			throw new IOException("原文件为NULL");
		}
		if(newPicture == null) {
			throw new IOException("新文件为NULL");
		}
		BufferedImage oldBufferedImage = ImageIO.read(oldPicture);
		BufferedImage newBufferedImage = new BufferedImage(oldBufferedImage.getWidth(), oldBufferedImage.getHeight(),BufferedImage.TYPE_INT_BGR);
		Graphics2D newGraphics2D = newBufferedImage.createGraphics();
		newGraphics2D.drawImage(oldBufferedImage, 0, 0, oldBufferedImage.getWidth(), oldBufferedImage.getHeight(), null);
		newGraphics2D.dispose();
		return ImageIO.write(newBufferedImage, type, newPicture);
	}
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