运行java程序连接mysql数据库是出现如下结果怎么回事？

关注:160  答案:3  mip版

解决时间 2021-01-24 13:56

提问者你若离去丶巴掌扇去

2021-01-24 05:27

程序：

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class ConnectionDemo

{

public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";

//数据库连接地址

public static final String DBURL = "jdbc:mysql://localhost:3306/mldn";

public static final String DBUSER = "MySQLserver";//数据库连接用户名

public static final String DBPASS = "manmanw68";//数据库连接密码

public static void main(String [] args){

Connection conn = null;

try

{

Class.forName(DBDRIVER);

}

catch (ClassNotFoundException e)

{

e.printStackTrace();

}

try

{

conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);

}

catch (SQLException e)

{

e.printStackTrace();

}

System.out.println(conn);

try

{

conn.close();

}

catch (SQLException e)

{

e.printStackTrace();

}

}

}

运行结果：

C:\Users\伊郁\Desktop>java ConnectionDemo

java.sql.SQLException: Access denied for user 'MySQLserver'@'localhost' (using p

assword: YES)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:934)

at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4104)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1299)

at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2338)

at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2

371)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2163)

at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:794)

at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou

rce)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java

:305)

at java.sql.DriverManager.getConnection(Unknown Source)

at java.sql.DriverManager.getConnection(Unknown Source)

at ConnectionDemo.main(ConnectionDemo.java:23)

null

Exception in thread "main" java.lang.NullPointerException

at ConnectionDemo.main(ConnectionDemo.java:32)

最佳答案

二级知识专家是你的阿离

2021-01-24 07:02

1没有导包 2没有数据库没有建好3密码错误

全部回答

1楼招人烦°惹人厌

2021-01-24 08:50

兄弟你怎么解决的 我和你一样

2楼霸气ヽ爵爷

2021-01-24 07:58

你的用户名有问题，再有你的driver 是自己封装的么，怎么不一样？

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