Java示例获取文件大小1

import java.net.URL;
import java.net.URLConnection;

public class Main {
   public static void main(String[] argv) throws Exception {
      int size;
      URL url = new URL("https://www.codingdict.com");
      URLConnection conn = url.openConnection();
      size = conn.getContentLength();

      if (size < 0)
        System.out.println("Could not determine file size.");
      else
        System.out.println("The size of file is = " + size + "bytes");
      conn.getInputStream().close();
   }
}