表單文件上傳與文件下載

2019-11-15 00:02:36

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供稿：網友

表單文件上傳與文件下載

一、簡介

　　使用form表單進行需要為form添加enctype="mult

二、示例

　　1、表單文件上傳

　　網頁代碼如下：

 1 <!DOCTYPE html> 2 <html> 3 <head> 4 </head> 5 <body>         6     <form action="${pageContext.request.contextPath}/file/upload.action" method="post" enctype="multipart/form-data"> 7         <div id="contentTable" style="border: 0px;"> 8             <h1 class="title" style="font-size: 15px; border-bottom: 1px solid #DFE3E6;">導入數據</h1> 9             <table width="80%">10             <tr>11                  <td width="20%"align="right">12                 選擇要上傳的文件 13                   </td> 14                 <td width="70%" id="name_h" title="" style="text-align: center;"> 15                 <input type="file"  name="xlsfile" id="xlsfile" />16                 </td>17                 </tr>18             </table>19             <div id="activityTable">20                  <input id="btnSave"  type="submit" value="導&nbsp;入" />21             </div>22         </div>23     </form>24 </body>25 </html>

　　后端上傳處理代碼：

 1     /** 2     *使用sPRingmvc處理文件上傳 3     */ 4     @RequestMapping("upload") 5     @ResponseBody 6     public boolean upload(HttpServletRequest request, HttpServletResponse response, Httpsession session) throws UnsupportedEncodingException { 7         String path = request.getSession().getServletContext().getRealPath(""); 8         Calendar calendar = Calendar.getInstance(); 9         calendar.setTime(new Date());10         request.setCharacterEncoding("UTF-8");11         path = String.format("%s//%s//%s//%s//%s//%s", path, "upload", "file", calendar.get(calendar.YEAR),12                 calendar.get(calendar.MONTH), calendar.get(calendar.DAY_OF_MONTH));13         File filepath = new File(path);14         if (!filepath.exists()) {15             filepath.mkdirs();16         }17          MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;18         獲得文件19         MultipartFile multipartFile = multipartRequest.getFile("xlsfile");20         OutputStream os = null;21         InputStream is = null;22         File uploadFile = null;23         try {24             is = multipartFile.getInputStream();25             uploadFile = new File(filepath, System.currentTimeMillis() + ".xls");26             os = new FileOutputStream(uploadFile);27             IOUtils.copy(is, os);//使用commons-io組件進行文件流的處理28             os.flush(); 29         } catch (IOException e) {30             e.printStackTrace();31             return false;32         }finally{33             IOUtils.closeQuietly(os);34             IOUtils.closeQuietly(is);35         }36     return true;37 }

　　2、文件下載

 1     /** 2     *使用springmvc進行文件下載處理 3     */ 4     @RequestMapping({ "/template" }) 5     public void downloadTemplate(HttpServletRequest request, HttpServletResponse response) 6             throws UnsupportedEncodingException { 7         String path = request.getSession().getServletContext().getRealPath(""); 8         String filename = "