Java 如何查看主机指定文件的最后修改时间

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

public class Main {
   public static void main(String[] argv) 
   throws Exception {
      URL u = new URL("http://127.0.0.1/java.bmp");
      URLConnection uc = u.openConnection();
      uc.setUseCaches(false);
      long timestamp = uc.getLastModified();
      System.out.println("java.bmp 文件最后修改时间 :"+timestamp);
   }
}

java.bmp 文件最后修改时间 24 May 2012 00:34:54