一、简介

　　使用form表单进行需要为form添加enctype="multipart/form-data" 属性，除此之外还需要将表单的提交方法改成post,如下 method="post"。

二、示例

　　1、表单文件上传

　　网页代码如下：

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12 选择要上传的文件 13 
          
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　　后端上传处理代码：

1     /** 2     *使用springmvc处理文件上传 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         获得文件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组件进行文件流的处理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、文件下载

1     /** 2     *使用springmvc进行文件下载处理 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")处理safari的乱码问题12         String fileName = new String(bytes, "ISO-8859-1"); 13         // 设置输出的格式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组件进行文件流的处理21         } catch (IOException e) {22             e.printStackTrace();23         }finally{24             IOUtils.closeQuietly(inStream);25         }