想烦请各位先进帮小弟指点迷津

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synchronized static public DefaultTableModel create_sortable(String sql,String db){ Statement stmt = null ; ResultSet rs = null ; DefaultTableModel tableModel = new DefaultTableModel (); Properties pro_language = ConfigManager.getLanguageConfig(); ConnectionManager connection = new ConnectionManager(); Connection conn = connection.openConnect(db); try{ stmt = conn.createStatement(); rs = stmt.executeQuery(sql); int length = rs.getMetaData().getColumnCount(); String [] arry = new String[length]; for(int i = 0; i<length;i++){ String column = rs.getMetaData().getColumnName(i+1).substring(4); if(pro_language.getProperty(column)!=null){ arry[i] = pro_language.getProperty(column); }else{ arry[i] = column ; } } tableModel.setDataVector(null, arry); Object[] o = null; while(rs.next()){ o= new Object[length]; for(int i =0 ;i<length;i++){ o[i] = rs.getObject(i+1); } tableModel.addRow; } TableModel sortable_model = setSortable(tableModel); rs.close(); stmt.close(); connection.closeConnect(conn); return (DefaultTableModel)sortable_model;  }catch(Exception e){ e.printStackTrace(); }finally{ if(rs!=null){ try{ rs.close(); }catch(Exception e){ } } if(stmt!=null){ try{ stmt.close(); }catch(Exception e){ } } }
 
 return null;  }