java读取网络上的图片并保存到本地，图片文件名不变

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class Getpic{
  public Getpic(){
  }

  public static boolean saveUrlAs(String fileUrl, String savePath)/*fileUrl网络资源地址*/
  {

  try
  {
  URL url = new URL(fileUrl);/*将网络资源地址传给,即赋值给url*/
  /*此为联系获得网络资源的固定格式用法，以便后面的in变量获得url截取网络资源的输入流*/
  HttpURLConnection connection = (HttpURLConnection)url.openConnection();
  DataInputStream in = new DataInputStream(connection.getInputStream());
  /*此处也可用BufferedInputStream与BufferedOutputStream*/
  DataOutputStream out = new DataOutputStream(new FileOutputStream(savePath));
  /*将参数savePath，即将截取的图片的存储在本地地址赋值给out输出流所指定的地址*/
  byte[] buffer = new byte[4096];
  int count = 0;
  while ((count = in.read(buffer)) > 0)/*将输入流以字节的形式读取并写入buffer中*/
  {
  out.write(buffer, 0, count);
  }
  out.close();/*后面三行为关闭输入输出流以及网络资源的固定格式*/
  in.close();
  connection.disconnect();
  return true;/*网络资源截取并存储本地成功返回true*/

  }
  catch (Exception e)
  {
  System.out.println(e + fileUrl + savePath);
  return false;
  }
  }

  public static void main(String[] args)
  {
  Getpic pic = new Getpic();/*创建实例*/
  String photoUrl =   
http://hiphotos.baidu.com/yanshennan/pic/item/03a505c8bcbaf6557f3e6f8a.jpg";
  /*photoUrl.substring(photoUrl.lastIndexOf("/")的方法将返回最后一个符号为
  * ‘/’后photoUrl变量中的所有字符，包裹此自身符号*/
  String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));
  String filePath = "E:";
  /*调用函数，并且进行传参*/
  boolean flag = pic.saveUrlAs(photoUrl, filePath + fileName);
  System.out.println("Run ok!\n Get URL file " + flag);
  System.out.println(filePath);
  System.out.println(fileName);
  }

}