网络编程，下载视频图片

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.channels.ReadableByteChannel;

import javax.net.ssl.HttpsURLConnection;


public class NetWork {
 static NetWork   net ;
/**
 * @param args
 * @throws Exception 
 */
public static void main(String[] args) throws Exception {
         net = new NetWork();
//需要下载的URL
String photoUrl = "http://h.hiphotos.baidu.com/image/pic/item/b3b7d0a20cf431adc4b317334936acaf2edd9854.jpg";
// 截取最后/后的字符串
String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));
//图片保存路径
String filePath = "D:";
/* 调用函数，并且进行传参 */
boolean flag = net.saveUrlAs(photoUrl, filePath + fileName);
System.out.println("Run ok!\n Get URL file " + flag);
System.out.println(filePath);
System.out.println(fileName);
}
public static boolean saveUrlAs(String fileUrl, String savePath) throws IOException/* fileUrl网络资源地址 */
{
 //首先我们要获得url的链接，我们要从哪里下载图片，这个图片的地址在哪里！
 URL  url = new URL(fileUrl);
/* 此为联系获得网络资源的固定格式用法，以便后面的het变量获得url截取网络资源的输入流 */
 HttpURLConnection het =(HttpURLConnection) url.openConnection();
  //getInputStream()方法可以获得网络连接输入，同时返回一个InputStream实例
 DataInputStream in = new DataInputStream(het.getInputStream());
 BufferedOutputStream    bis = new BufferedOutputStream(new FileOutputStream(savePath));
byte[]  buff = new byte[4096];
int count;
while ((count=in.read(buff))>0) {
         bis.write(buff, 0, count);
         return true;
}
bis.close();
in.close();
het.disconnect();
return false;
}

}