网络文件怎么利用Java进行读取并下载

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import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class DownloadFromNetwork {     public static void downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{     URL url = new URL(urlStr);      HttpURLConnection conn = (HttpURLConnection)url.openConnection();          //设置超时间为3秒     conn.setConnectTimeout(3*1000);     //防止屏蔽程序抓取而返回403错误     conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; windows NT; DigExt)");      //得到输入流     InputStream inputStream = conn.getInputStream();      //获取自己数组     byte[] getData = readInputStream(inputStream);        //文件保存位置     File saveDir = new File(savePath);     if(!saveDir.exists()){       saveDir.mkdirs();     }     File file = new File(saveDir+File.separator+fileName);       FileOutputStream fos = new FileOutputStream(file);        fos.write(getData);      if(fos!=null){       fos.close();      }     if(inputStream!=null){       inputStream.close();     }      System.out.println("info:"+url+" download success");     }       public static byte[] readInputStream(InputStream inputStream) throws IOException {      byte[] buffer = new byte[1024];      int len = 0;      ByteArrayOutputStream bos = new ByteArrayOutputStream();      while((len = inputStream.read(buffer)) != -1) {        bos.write(buffer, 0, len);      }      bos.close();      return bos.toByteArray();    }     public static void main(String[] args) {     try{       for (int i = 201; i <=520; i++) {        downLoadFromUrl("https://file.lsjlt.com/upload/202305/30/u0w4rojq5ur.jpg",i + ".jpg","E:/Downloads/wallpaper/baiduSkin");       }    }catch (Exception e) {       // TODO: handle exception     }   } }