如下報錯

 com.alibaba.druid.support.logging.JakartaCommonsLoggingImpl error
嚴重: create connection SQLException, url: jdbc:mysql://192.168.211.129:3306/spring_db?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8&useSSL=false, errorCode 1045, state 28000
java.sql.SQLException: Access denied for user ''@'192.168.211.1' (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:1513)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2466)

解決方案一

檢視applicationContext.xml(Spring配置檔案)配置檔案中的 name 值是否如下:
Druid資料來源

• name=“driverClassName” 不是 “driver”
• name=“url”
• name=“username” 不是 “name"或者"user”
• name=“password”

<!--    引入外部檔案-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

<!--  將資料來源交給IOC容器管理-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

解決方案二

檢視:jdbc.properties 檔案是否書寫正確

• 連線賬戶和密碼是否正確
• 如果是用mysql8.0下面的jdbc.driver要改成 com.mysql.cj.jdbc.Driver

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://192.168.211.129:3306/spring_db?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8&useSSL=false
jdbc.username=root
jdbc.password=root