1 import java.net.URL;
 2 import java.net.URLConnection;
 3 import java.text.DecimalFormat;
 4 
 5 /*
 6 计算指定URL的文件大小
 7  */
 8 public class FlowTool{
 9     public static void main(String[] args)throws Exception{
10         URL url = new URL("http://www.baidu.com");
11         URLConnection uc = url.openConnection();
12         String fileSize = new DecimalFormat("0.00").format((float) uc.getContentLength() / 1024);
13         System.out.println("文件大小："+fileSize+"KB");
14     }
15 }