获取远程图片宽高

import java.awt.image.BufferedImage;  
import java.io.BufferedInputStream;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import java.net.URL;  
  
public class ReturnImgWH {  
    //读取远程url图片,得到宽高  
    public int[] returnImgWH(String imgurl) {  
        boolean b=false;  
        try {  
            //实例化url  
            URL url = new URL(imgurl);  
            //载入图片到输入流  
            java.io.BufferedInputStream bis = new BufferedInputStream(url.openStream());  
            //实例化存储字节数组  
            byte[] bytes = new byte[100];  
            //设置写入路径以及图片名称  
            OutputStream bos = new FileOutputStream(new File("E:\44.gif"));  
            int len;  
            while ((len = bis.read(bytes)) > 0) {  
                bos.write(bytes, 0, len);  
            }  
            bis.close();  
            bos.flush();  
            bos.close();  
            //关闭输出流  
            b=true;  
        } catch (Exception e) {  
            //如果图片未找到  
            b=false;  
        }  
        int[] a = new int[2];  
        if(b){//图片存在  
            //得到文件  
            java.io.File file = new java.io.File("E:\44.gif");  
            BufferedImage bi = null;  
            boolean imgwrong=false;  
            try {  
                //读取图片  
                bi = javax.imageio.ImageIO.read(file);  
                try{  
                    //判断文件图片是否能正常显示,有些图片编码不正确  
                    int i = bi.getType();  
                    imgwrong=true;  
                }catch(Exception e){  
                    imgwrong=false;  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
            if(imgwrong){  
                a[0] = bi.getWidth(); //获得 宽度  
                a[1] = bi.getHeight(); //获得 高度  
            }else{  
                a=null;  
            }  
            //删除文件  
            file.delete();  
        }else{//图片不存在  
            a=null;  
        }  
       return a;  
  
    }  
  
    public static void main(String[] args) {  
        ReturnImgWH i = new ReturnImgWH();  
          int[] a=i.returnImgWH("http://www.tupian.com/333.gif");  
          if(a==null){  
              System.out.println("图片未找到!");  
          }else{  
              System.out.println("宽为" + a[0]);  
              System.out.println("高为" + a[1]);  
          }  
    }  
}