java编程简单获取图片像素的方法

package cn.net.comsys.sso;import java.awt.image.BufferedImage;import javax.imageio.ImageIO;import java.io.*;public class Test {public static void main(String args[]) {File file = new File("a.bmp");BufferedImage bi = null;try {bi = ImageIO.read(file);} catch (Exception e) {e.printStackTrace();}int width = bi.getWidth(); // 像素int height = bi.getHeight(); // 像素System.out.println("width=" + width + ",height=" + height + ".");}}