Java读取并下载网络文件的方法

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;/** * Java读取并下载网络文件 * @author Marydon * @createTime 2017年8月18日下午5:24:09 * @updateTime * @Email:marydon2017@163.com * @version:1.0.0 * @referenceLink * <a href="http://blog.csdn.net/xb12369/article/details/40543649/"> java 从网络Url中下载文件</a> */public class DownloadFromNetwork {  /**    * 从网络Url中下载文件    * @param urlStr    * @param fileName    * @param savePath    * @throws IOException    */   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");     }    /**    * 从输入流中获取字节数组    * @param inputStream    * @return    * @throws IOException    */   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://ss1.bdstatic.com/kvoZeXSm1A5BphGlnYG/skin/" + i + ".jpg",i + ".jpg","E:/Downloads/wallpaper/baiduSkin");       }    }catch (Exception e) {       // TODO: handle exception     }   } }