Java从数据库取出BLOB数据放入map中，从map中拿出转换成String类型数据

for (Map<String, Object> map:list){            **Blob blob=((BLOB) map.get("FILEDATA"));**//得到并强转成BLOB            String content="";            try {                **content = new String(blob.getBytes((long)1, (int)blob.length()));**//转成String            } catch (SQLException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }