Java 如何将网络资源url转化为File文件

private File getNetUrlHttp(String path){

       //对本地文件命名，path是http的完整路径，主要得到资源的名字

        String newUrl = path;

        newUrl = newUrl.split( "[?]" )[ 0 ];

        String[] bb = newUrl.split( "/" );

        //得到最后一个分隔符后的名字

        String fileName = bb[bb.length - 1 ];

        //保存到本地的路径

        String filePath= "e:\\audio\\" +fileName;

        File file = null ;

        URL urlfile;

        InputStream inputStream = null ;

        OutputStream outputStream = null ;

        try {

            //判断文件的父级目录是否存在，不存在则创建

            file = new File(filePath);

            if (!file.getParentFile().exists()){

                file.getParentFile().mkdirs();

            }

            try {

                //创建文件

                file.createNewFile();

            } catch (Exception e){

                e.printStackTrace();

            }

            //下载

            urlfile = new URL(newUrl);

            inputStream = urlfile.openStream();

            outputStream = new FileOutputStream(file);

            int bytesRead = 0 ;

            byte [] buffer = new byte [ 8192 ];

            while ((bytesRead=inputStream.read(buffer, 0 , 8192 ))!=- 1 ) {

                outputStream.write(buffer, 0 , bytesRead);

            }

            } catch (Exception e) {

                e.printStackTrace();

            } finally {

                try {

                    if ( null != outputStream) {

                        outputStream.close();

                    }

                    if ( null != inputStream) {

                        inputStream.close();

                    }

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

          return file;

        }

/**

  * url转变为 MultipartFile对象

  * @param url

  * @param fileName

  * @return

  * @throws Exception

  */

private static MultipartFile createFileItem(String url, String fileName) throws Exception{

     FileItem item = null ;

     try {

         HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();

         conn.setReadTimeout( 30000 );

         conn.setConnectTimeout( 30000 );

         //设置应用程序要从网络连接读取数据

         conn.setDoInput( true );

         conn.setRequestMethod( "GET" );

         if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {

             InputStream is = conn.getInputStream();

             FileItemFactory factory = new DiskFileItemFactory( 16 , null );

             String textFieldName = "uploadfile" ;

             item = factory.createItem(textFieldName, ContentType.APPLICATION_OCTET_STREAM.toString(), false , fileName);

             OutputStream os = item.getOutputStream();

             int bytesRead = 0 ;

             byte [] buffer = new byte [ 8192 ];

             while ((bytesRead = is.read(buffer, 0 , 8192 )) != - 1 ) {

                 os.write(buffer, 0 , bytesRead);

             }

             os.close();

             is.close();

         }

     } catch (IOException e) {

         throw new RuntimeException( "文件下载失败" , e);

     }

     return new CommonsMultipartFile(item);

}