js判斷陣列是Array型別
阿新 • • 發佈:2021-01-11
1. 檔案上傳
關鍵程式碼:
public void save(File cenclosure,Collectfile collectfile) { try { InputStream inputStream = new FileInputStream(cenclosure); collectfile.setCenclosure(inputStream); String name = cenclosure.getName(); collectfile.setCmenclosure(name); }catch (Exception e) { // TODO: handle exception e.printStackTrace(); } if (Validation.hasErrors()) { this.printError(Validation.getErrorsAsString()); return; } collectfileService.save(collectfile); }
注意事項:
1.其中引數cenclosure 要和前端form表單中的引數名稱一致,否則無法上傳
2.將File型別轉換成流的形式,資料庫中以二進位制的形式儲存
2. 檔案下載
關鍵程式碼:
/** * 檔案下載 * @param omenclosure 檔名 * @throws IOException */ public void downloadLocal(String id){ try { //根據編號查詢得到實體類物件 Collectfile collectfile = (Collectfile) collectfileService.findById(id); HttpServletResponse response= response(); //獲取InputStrem流 InputStream in = collectfile.getCenclosure(); response.setContentType("application/x-msdownload"); response.addHeader("Content-Disposition", "attachment; filename="+new String(collectfile.getCmenclosure().getBytes("gb2312"),"iso-8859-1")); OutputStream out =response.getOutputStream(); byte[] b = new byte[1024]; int l; while((l = in.read(b)) != -1){ out.write(b, 0, l); } in.close(); out.flush(); out.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }