package util;

import java.sql.Connection;

import java.sql.DriverManager;

public class DBHelper {

? ?

private static final String driver = "com.mysql.jdbc.Driver"; //數(shù)據(jù)庫驅(qū)動

//連接數(shù)據(jù)庫的URL地址

private static final String url="jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=UTF-8";?

private static final String username="root";//數(shù)據(jù)庫的用戶名

private static final String password="Aa123456";//數(shù)據(jù)庫的密碼

? ??

private static Connection conn=null;

//靜態(tài)代碼塊負責加載驅(qū)動

static?

{

try

{

Class.forName(driver);

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

//單例模式返回數(shù)據(jù)庫連接對象

public static Connection getConnection() throws Exception

{

if(conn==null)

{

conn = DriverManager.getConnection(url, username, password);

return conn;

}

return conn;

}

public static void main(String[] args) {

try

{

? Connection conn = DBHelper.getConnection();

? if(conn!=null)

? {

? System.out.println("數(shù)據(jù)庫連接正常！");

? }

? else

? {

? System.out.println("數(shù)據(jù)庫連接異常！");

? }

}

catch(Exception ex)

{

ex.printStackTrace();

}

}

}

為什么我沒寫密碼就報錯，視頻中都沒寫密碼