表單文件上傳與文件下載

時間 2019-11-17

標籤表單文件上傳下載欄目 HTML 简体版

原文原文鏈接

1、簡介html

　　使用form表單進行須要爲form添加enctype="multipart/form-data" 屬性，除此以外還須要將表單的提交方法改爲post,以下 method="post"。spring

2、示例後端

　　一、表單文件上傳session

　　網頁代碼以下：mvc

 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>

　　後端上傳處理代碼：app

 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         得到文件
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 }

　　二、文件下載post

 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 = "模板文件.xls";
 9         File file = new File(path +  "\\file\\templagte\\" + filename);
10         String userAgent = request.getHeader("User-Agent");
11         byte[] bytes = userAgent.contains("MSIE") ? filename.getBytes() : filename.getBytes("UTF-8"); // fileName.getBytes("UTF-8")處理safari的亂碼問題
12         String fileName = new String(bytes, "ISO-8859-1"); 
13         // 設置輸出的格式
14         response.setContentType("multipart/form-data");
15         response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
16         
17         InputStream inStream = null;
18         try {
19             inStream = new FileInputStream(file);
20             IOUtils.copy(inStream, response.getOutputStream());//使用commons-io組件進行文件流的處理
21         } catch (IOException e) {
22             e.printStackTrace();
23         }finally{
24             IOUtils.closeQuietly(inStream);
25         }