java:从RGBA格式的图像数据byte[]创建BufferedImage对象

	/**
	 * 从RGBA格式图像矩阵数据创建一个BufferedImage
	 * @param matrixRGBA RGBA格式图像矩阵数据,为null则创建一个指定尺寸的空图像
	 * @param width
	 * @param height
	 * @return
	 */
	public static BufferedImage createRGBAImage(byte[] matrixRGBA,int width,int height){
		// 定义每像素字节数
		int bytePerPixel = 4;
		
		if(null != matrixRGBA&&matrixRGBA.length == width*height*bytePerPixel){
			throw new IllegalArugmentException("invalid image description");
		}
		// 将图像数据byte[]封装为DataBuffer
	    DataBufferByte dataBuffer = null == matrixRGBA ? null : new DataBufferByte(matrixRGBA, matrixRGBA.length);
	    // 定义色彩空间 sRGB
	    ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
	    int[] bOffs = {0,1,2};
	    // 根据色彩空间创建色彩模型(ColorModel实例)，bOffs用于定义R,G,B三个分量在每个像素数据中的位置
	    ComponentColorModel colorModel = new ComponentColorModel(cs, false, false,
	                                         Transparency.OPAQUE,
	                                         DataBuffer.TYPE_BYTE);
	    // 从DataBuffer创建光栅对象Raster   
	    WritableRaster raster = null != dataBuffer
	    		? Raster.createInterleavedRaster(dataBuffer, width, height, width*bytePerPixel, bytePerPixel, bOffs, null)
	    		: Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE, width, height,width*bytePerPixel, bytePerPixel, bOffs, null);
	    BufferedImage img = new BufferedImage(colorModel,raster,colorModel.isAlphaPremultiplied(),null);
	    return  img;	    
	}