將網絡資源url轉化為File文件
將互聯網上的http開頭的url資源，保存到本地。
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private File getNetUrlHttp(String path){ //對本地文件命名，path是http的完整路徑，主要得到資源的名字 String newUrl = path; newUrl = newUrl.split("[?]")[0]; String[] bb = newUrl.split("/"); //得到最后一個分隔符后的名字 String fileName = bb[bb.length - 1]; //保存到本地的路徑 String filePath="e:\\audio\\"+fileName; File file = null; URL urlfile; InputStream inputStream = null; OutputStream outputStream = null; try{ //判斷文件的父級目錄是否存在，不存在則創建 file = new File(filePath); if(!file.getParentFile().exists()){ file.getParentFile().mkdirs(); } try{ //創建文件 file.createNewFile(); }catch (Exception e){ e.printStackTrace(); } //下載 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轉變為 MultipartFile對象
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/** * url轉變為 MultipartFile對象 * @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); //設置應用程序要從網絡連接讀取數據 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("文件下載失敗", e); } return new CommonsMultipartFile(item);} |
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/x_christ1/article/details/112536203
