How does Java convert network resource url into File file

Convert network resource url into File file

Save the url resources at the beginning of http on the Internet locally.

 private File getNetUrlHttp(String path){
       // Name the local file, path Yes http The full path of, mainly getting the name of the resource 
        String newUrl = path;
        newUrl = newUrl.split("[?]")[0];
        String[] bb = newUrl.split("/");
        // Get the last 1 The name after the separator 
        String fileName = bb[bb.length - 1]; 
        // Save to local path 
        String filePath="e:\\audio\\"+fileName; 
        File file = null;
 
        URL urlfile;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try{
            // Determine whether the parent directory of the file exists, and create if it does not exist 
            file = new File(filePath);
            if(!file.getParentFile().exists()){
                file.getParentFile().mkdirs();
            }
            try{
                // Create a file 
                file.createNewFile();
            }catch (Exception e){
                e.printStackTrace();
            }
            // Download 
            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 to MultipartFile Object

/**
 * url Turn into  MultipartFile Object 
 * @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);
        // Setting the application to read data from a network connection 
        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(" File download failed ", e);
    }
    return new CommonsMultipartFile(item);
}