使用jdbcTemplate 保存图片 至数据库 以及 从数据库读取 保存到本地

String picPath = "";  
//@author wxd
    final Map map = new HashMap<String, Integer>();  
    if( uploadRequest.getSize("file") > 0 ){  
         String name = uploadRequest.getFileName("file");  
         final String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+"_"+name;  
         InputStream is = uploadRequest.getFileAsStream("file");  
         final  byte[] img = FileCopyUtils.copyToByteArray(is);  
        String sqlforInsert = "insert into TOOL_IM_FILE values (?,?,?)";  
        final   LobHandler  lobHandler = new DefaultLobHandler();  
        jdbcTemplate.execute(sqlforInsert, new AbstractLobCreatingPreparedStatementCallback(lobHandler) {  
            @Override  
            protected void setValues(PreparedStatement ps, LobCreator lobCreator)  
                    throws SQLException, DataAccessException {  
  
                String sqlforMaxId = "select max(id) id from TOOL_IM_FILE";  
                int maxid  = 0;  
                try {  
                    maxid   = jdbcTemplate.queryForObject(sqlforMaxId, Integer.class);  
                    maxid+=1;  
                } catch (Exception e) {  
                    maxid = 1;  
                }  
                    map.put("maxid", maxid);  
                    ps.setInt(1,maxid);  
                    ps.setString(2, fileName);  
                    lobCreator.setBlobAsBytes(ps, 3, img);  
            }  
        });  
     System.out.println(resourceRequest.getContextPath());  
     //2.读出来返回存到服务器,直接用is流，获取地址  
    String path = resourceRequest.getContextPath()+"/data/layimtemp/";  
    File pathFile = new File(path);  
    if(!pathFile.exists()){//判断路径是否存在  
        pathFile.mkdirs();  
    }   
    File file = new File(path+fileName);  
    if (!file.exists())  
    {   
        file.createNewFile(); // 如果文件不存在，则创建   
    }  
      
    //从数据库读取流刷到文件中  
    String sqlforimage = "select  FILES from TOOL_IM_FILE where  id =" + map.get("maxid");  
    final OutputStream os=new FileOutputStream(file);  
    jdbcTemplate.query(sqlforimage,  new AbstractLobStreamingResultSetExtractor() {  
  
        @Override  
        protected void handleNoRowFound() throws DataAccessException {  
        System.out.println("Not Found result!");  
        }  
  
        @Override  
        protected void streamData(ResultSet rs) throws SQLException,  
                IOException, DataAccessException {  
              InputStream is = lobHandler.getBlobAsBinaryStream(rs, 1);  
              if (is != null) {  
                    FileCopyUtils.copy(is, os);  
                  }  
        }  
    } );