java.sql.SQLException:对用户'root'@'localhost'拒绝访问(使用密码:YES)

Question

以下代码:

Class.forName("com.mysql.jdbc.Driver");
Connection m_connection = DriverManager.getConnection("jdbc:mysql://localhost","root","root");

抛出此异常getConnection():

java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919)
    at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1244)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2397)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2430)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2215)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at db.Database.<init>(Database.java:91)
    at db.Main.main(Main.java:10)

这是怎么造成的,我该如何解决？

编辑:

    public static void main(String[] args) throws ClassNotFoundException, ServletException, SQLException 
    {

        try
        {
            Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/?user=root&password=rootpassword"); 
            Statement   s = (Statement) conn.createStatement();
            int result = s.executeUpdate("CREATE DATABASE databasename");
        }


        catch ( Exception e)
        {
            e.printStackTrace();
        }
}

产品:

java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919)
    at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1244)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2397)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2430)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2215)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:813)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:334)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at db.Main.main(Main.java:19)

Answer 1

这可以帮助您:

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY '%password%' WITH GRANT OPTION;

使用命令行或某些GUI工具执行它.

不要忘记更换%password%真实密码.

Answer 2

在从头开始创建数据库时,您可以使用:

Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/?user=root&password=rootpassword"); 
PreparedStatement ps = connection.prepareStatement("CREATE DATABASE databasename");
int result = ps.executeUpdate();

这是一个相同的场景.

Answer 3

我遇到了类似的问题,但不同之处在于:我没有localhost从远程PC上执行我的JavaApp .所以我得到类似的东西java.sql.SQLException: Access denied for user 'root'@'a.remote.ip.adress' (using password: YES) 要解决这个问题,您只需登录phpMyAdmin,转到Users,单击add user并输入要从中执行JavaApp的主机(或选择Any Host)

Answer 4

你可以用它

   static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
   static final String DB_URL = "jdbc:mysql://localhost:3306/YOUR_DB_NAME";


   static final String USER = "root";
   static final String PASS = "YOUR_ROOT_PASSWORD"; 

  Connection conn = DriverManager.getConnection(DB_URL,USER,PASS);

你必须提供正确的root密码.

Answer 5

我遇到了同样的问题，如下所示

"java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)". Problem was "WRONG PASSWORD". 

将查询按原样复制并粘贴到 shell 中，以检查它是否提供了所需的输出。小错误会消耗更多时间。

Answer 6

这似乎主要发生在 MySQL 用户名和密码不正确时。检查您的 MySQL 用户名和密码。

Answer 7

这特定于Ubuntu 18.04 LTS和MySQL5.x。单击此链接， 从此处开始进行所有操作：

sudo mysql_secure_installation

sudo mysql

一旦登录到MySQL，然后从MySQL提示符下执行以下命令：

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
FLUSH PRIVILEGES;

现在验证表是否具有根目录的密码

SELECT user,authentication_string,plugin,host FROM mysql.user;

这解决了我的问题，现在我可以登录了。