java 从网络Url中下载文件

来源：互联网发布：日亚海淘转运公司知乎编辑：程序博客网时间：2024/04/28 03:05

/**
   * 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.mkdir();
       }
       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{
           downLoadFromUrl("http://101.95.48.97:8005/res/upload/interface/apptutorials/manualstypeico/6f83ce8f-0da5-49b3-bac8-fd5fc67d2725.png",
                   "百度.jpg","d:/resource/images/diaodiao/country/");
       }catch (Exception e) {
           // TODO: handle exception
       }
   }

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