spring中文件上传

 

  protected ModelAndView onSubmit(HttpServletRequest request,
   HttpServletResponse response,
   Object command,
   BindException errors)
  throws Exception {
   try  
   {
    // cast the bean
    String typeId = request.getParameter("typeId");

//CommonDataImpl是一个javaBean
    CommonDataImplbean = (CommonDataImpl) command;
    MultipartFile file = bean.getFile();
   
    if (file == null){
     throw new Exception("上传失败：文件为�空!");
    }   
    if(file.getSize()>104857600){   
     throw new Exception("上传失败：文件大小不能超过100M");               
    }   
    //得到upload文件�名   
    String filename=file.getOriginalFilename();
    //取得后缀名
    String ext = filename.substring(filename.lastIndexOf("."));
    //设置服务器相对存储路径
    String localSavePath = "data/uploadFile/res/wx/";
    //设置存储路径
    String filePath=this.getServletContext().getRealPath("/")+localSavePath;
    //取得用户定义的文件名
    String name = request.getParameter("name");
    if(file.getSize()>0){
     try {
      if(StringUtils.isEmpty(name)){
       SaveFileFromInputStream(file.getInputStream(),filePath,filename);
      }else{
       filename = name + ext;
       SaveFileFromInputStream(file.getInputStream(),filePath,filename);
      }
      
     } catch (IOException e) {   
      System.out.println(e.getMessage());   
      return null;
     }   
    }else{   
     throw new Exception("上传失败：上传文件不能为�空");
    }   
   // well, let's do nothing with the bean for now and return:   
    try {
     return super.onSubmit(request, response, command, errors);
    } catch (Exception e) {   
     System.out.println(e.getMessage());   
     return null;   
    }
   }catch(Exception ex){   
    System.out.println(ex.getMessage());   
    return null;   
   }
   
 }    

     public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException   
    {         
        FileOutputStream fs=new FileOutputStream( path + "/"+ filename);   
        byte[] buffer =new byte[1024*1024];   
        int bytesum = 0;   
        int byteread = 0;    
        while ((byteread=stream.read(buffer))!=-1)   
        {   
           bytesum+=byteread;   
           fs.write(buffer,0,byteread);   
  
           fs.flush();   
        }    
        fs.close();   
        stream.close();         
    }