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);  }}

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