Java讀取圖片文件的寬度和高度

InputStream is = new FileInputStream(filename);//通過文件名稱讀取

或

InputStream is =new ByteArrayInputStream(byte[] a);//通過文件的字節數組讀取


BufferedImage buff = ImageIO.read(is);
buff.getWidth();　//得到圖片的寬度
buff.getHeight(); //得到圖片的高度
is.close(); //關閉Stream