Java mysql连接

public List<String> getDBTable(String tableName) {List<String> columns = new ArrayList<String>();String driver = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://127.0.0.1:3306/sshdb";try {Class.forName(driver);Connection conn = DriverManager.getConnection(url, "root", "");Statement stm = conn.createStatement();ResultSet rs = stm.executeQuery("show columns from " + tableName);while(rs.next()) {columns.add(rs.getString("Field"));}rs.close();stm.close();conn.close();} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}return columns;}