BLOB上传图片的问题

我想用mysql中的longblob存图片或者BT的种子,但是写完代码后发现只可以上传TXT,和XLS文件.这是怎么回事啊.  
public  void  fileToField(String  movie_name,String  title,String  type_id,String  infile)  throws  Exception  {  
                   FileInputStream  fis  =  null;    
                   Connection  conn  =  null;  
                   try  {  
                               conn  =  DBAsource.getConnection();  
                               file  =  new  File(infile);    
                               fis  =  new  FileInputStream(file);    
                               //文件后缀名  
                               String  file_type  =  infile.substring(infile.lastIndexOf(".")  +  1,  infile.length());  
                               pstmt  =  conn.prepareStatement("insert  into  bt_movie_info_t(movie_name,title,type_id,file_type,movie_dsc)  values('"+movie_name+"','"+title+"','"+type_id+"','"+file_type+"',?)");    
                               pstmt.setBinaryStream(1,fis,fis.available());  //第二个参数为文件的内容    
                               pstmt.executeUpdate();    
                   }  catch(Exception  e)  {  
                               e.getMessage();  
                   }  finally  {    
                   //关闭所打开的对像//    
                               pstmt.close();    
                               fis.close();    
                               conn.close();    
                   }    
 
       }  
请问是不是我哪里写错了