java 获取图片尺寸及大小

InputStream is = new URL("http://ruanliecache.rydigital.com/rt0/rs640x538/fy/uploads/2013/04/1146.jpg").openStream();

BufferedImage sourceImg =ImageIO.read(is);

// // System.out.println(String.format("%.1f",picture.length()/1024.0));
System.out.println(sourceImg.getWidth());
System.out.println(sourceImg.getHeight());

File picture = new File("C:/Users/Administrator/Pictures/个人图片/neusoft.png");
BufferedImage sourceImg =ImageIO.read(new FileInputStream(picture));
System.out.println(String.format("%.1f",picture.length()/1024.0));
System.out.println(sourceImg.getWidth());
System.out.println(sourceImg.getHeight());