简单的上传文件

前端代码：

　　　　　<tr>
            <td align="right">上传头像：</td>
            <td>
                 <form method="post" enctype="multipart/form-data" action="/member/uploadHeadPhoto.do" id="uploadHeadPhotoForm"> 
                       <input type="file" name="headPhotoFile" id="headPhotoFile"/><br/>
                 </form>
             </td> 
         </tr>
　　　　　<tr><td><a href="javascript:void(0);" onclick="save();">保存</a></td></tr>

js：

 function save(){ 

　　//判断图片类型　　
　　var headPhotoFile = $("#headPhotoFile").val();
    if(headPhotoFile){
         if(!/.(gif|jpg|jpeg|png|GIF|JPG|PNG)$/.test(headPhotoFile)){
            alert("图片类型必须是gif,jpeg,jpg,png中的一种");
            return;
           }
      }

　　$("#uploadHeadPhotoForm").submit();

　　}

后端代码：   

    @RequestMapping(value = "/uploadHeadPhoto.do", method = RequestMethod.POST)
    public String uploadHeadPhoto(@RequestParam("headPhotoFile") MultipartFile headPhotoFile,
            @RequestParam(value = "userid") Long userId,
            HttpServletRequest request,HttpServletResponse response) {
        if(!headPhotoFile.isEmpty()){
            try {
                byte[] bytes = headPhotoFile.getBytes();
                String path = request.getSession().getServletContext().getRealPath("/");
                String originalFilename = headPhotoFile.getOriginalFilename();
                String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + "." + originalFilename.split("\.")[1];
                String relativePath = "/项目路径/images/pictures/" + fileName;
                
                BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(new File(path + relativePath)));
                stream.write(bytes);
                stream.close();
                
                //获取此用户原来的头像
                Member member = memberService.getMember(userId);
                
                if(member != null  && !"".equals(member.getHeadphoto()) && member.getHeadphoto() != null){
                    String oldPath = path + "/项目路径/images/pictures/" + member.getHeadphoto();
                    deleteFile(oldPath);        //删除原来的用户头像
                }
                System.out.println("上传头像成功");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                System.out.println("上传头像失败");
                e.printStackTrace();
            }
            
        }
        return "redirect:项目跳转路径";
    }


　

　　　private void deleteFile(String oldPath) {　　//删除文件
　　　　　　// TODO Auto-generated method stub
　　　　　　File oldFile = new File(oldPath);
　　　　　　if(oldFile.isFile() && oldFile.exists()){
　　　　　　　　oldFile.delete();
　　　　　　}
　　　　}