根据Mysql查询组成list

ResultSetMetaData md = rs.getMetaData();//获取键名
            int columnCount = md.getColumnCount();//获取行的数量
            Map<String, String> rowData = new HashMap<>();
            while (rs.next()) {
                rowData = new HashMap();//声明Map
                for (int i = 1; i <= columnCount; i++) {
                    rowData.put(md.getColumnName(i), rs.getString(i));//获取键名及值
                }
                list.add(rowData);
            }