连接数据库时username冲突

在连接数据库时遇到的问题：Access denied for user ‘ccccccc‘@‘localhost‘ (using password: YES)

测试连接MyTest：

public class MyTest {
    public static void main(String[] args) throws SQLException {
        ApplicationContext context = new ClassPathXmlApplicationContext("database.xml");
        DruidDataSource dataSource = context.getBean("dataSource", DruidDataSource.class);
        System.out.println(dataSource.getConnection());
    }
}

配置的database.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!--加载外部配置文件
		在加载外部依赖文件的时候需要context命名空间
	-->
    <context:property-placeholder location="classpath:dbConfig.properties"/>

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${username}"></property>
        <property name="password" value="${password}"></property>
        <property name="url" value="${url}"></property>
        <property name="driverClassName" value="${driverClassName}"></property>
     </bean>
</beans>

产生的异常：

严重: create connection SQLException, url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useSSL=false, errorCode 1045, state 28000
java.sql.SQLException: Access denied for user ‘ccccccc‘@‘localhost‘ (using password: YES)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2199)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:778)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1644)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1710)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2753)

dbConfig.properties文件修改前：

username=root
password=123456
url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useSSL=false
driverClassName=com.mysql.jdbc.Driver

dbConfig.properties文件修改后：

jdbc.username=root
password=123456
url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useSSL=false
driverClassName=com.mysql.jdbc.Driver

xml文件也需修改：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!--加载外部配置文件
		在加载外部依赖文件的时候需要context命名空间
	-->
    <context:property-placeholder location="classpath:dbConfig.properties"/>

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${password}"></property>
        <property name="url" value="${url}"></property>
        <property name="driverClassName" value="${driverClassName}"></property>
     </bean>
</beans>

产生问题的原因：这是和主机名称username产生冲突了，修改即可

com.mysql.jdbc.JDBC4Connection@4b9e255

连接数据库时username冲突

原文：https://www.cnblogs.com/netu/p/14320978.html