import java.io.IOException;
import java.awt.image.BufferedImage;
import java.net.URL;
import java.io.BufferedInputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.File;
import javax.imageio.ImageIO;

public class Img2 {
//讀取遠程url圖片,得到寬高
    public int[] returnImgWH(String imgurl) {
        boolean b=false;
        try {
            //實例化url
            URL url = new URL(imgurl);
            //載入圖片到輸入流
            java.io.BufferedInputStream bis = new BufferedInputStream(url.openStream());
            //實例化存儲字節數組
            byte[] bytes = new byte[100];
            //設置寫入路徑以及圖片名稱
            OutputStream bos = new FileOutputStream(new File( "C:\\thetempimg.gif"));
            int len;
            while ((len = bis.read(bytes)) > 0) {
                bos.write(bytes, 0, len);
            }
            bis.close();
            bos.flush();
            bos.close();
            //關閉輸出流
            b=true;
        } catch (Exception e) {
            //如果圖片未找到
            b=false;
        }
        int[] a = new int[2];
        if(b){    //圖片存在
            //得到文件
            java.io.File file = new java.io.File("C:\\thetempimg.gif");
            BufferedImage bi = null;
            try {
                //讀取圖片
                bi = javax.imageio.ImageIO.read(file);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            a[0] = bi.getWidth(); //獲得 寬度
            a[1] = bi.getHeight(); //獲得 高度
            //刪除文件
            file.delete();
        }else{     //圖片不存在
            a=null;
        }
       return a;

    }

    public static void main(String[] args) {
        Img2 i = new Img2();
        int[] a=i.returnImgWH("        if(a==null){
            System.out.println("圖片未找到!");
        }else{
            System.out.println("寬為" + a[0]);
            System.out.println("高為" + a[1]);
        }
    }
}