Java 实例 – 获取远程文件大小

import java.net.URL;
import java.net.URLConnection;
 
public class Main {
   public static void main(String[] args) throws Exception {
      int size;
      URL url = new URL("https://www.itzixishi.com/statics/images/logo.png");
      URLConnection conn = url.openConnection();
      size = conn.getContentLength();
      if (size < 0)
          System.out.println("无法获取文件大小。");
      else
        System.out.println("文件大小为：" + size + " bytes");
      conn.getInputStream().close();
   }
}