【SSM】报错 Access denied for user ‘WYF‘@‘localhost‘ (using password: YES) 数据的用户名变成了电脑的用户名

报错信息

整合SSM的时候，加载数据库报错信息如下（仅截取了一部分）：

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
	at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)
	at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68)
	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:271)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:69)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:56)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104)
	... 41 more
Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
	at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
	at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
	... 51 more

Debug之后出现了以下报错信息：（其中WYF是电脑的用户名）

Access denied for user 'WYF'@'localhost' (using password: YES)

解决方法

第一步：先检查jdbc.propertites配置文件中的driver，url，user，password的配置无误

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/seckill?useUnicode=true&characterEncoding=utf8
username=root
password=123456

第二步：查看MySQL中的user权限（可以先不进行，直接进行第三步试试）

use mysql
select host, user from user;
update user set host ='%' where user='root';

第三步:由于报错显示了用户名，所以应该是导入配置的时候出了问题，
查看我的spring-dao.xml配置文件：

原本的配置
<context:property-placeholder location="classpath:jdbc.properties"/>

修改为：
<context:property-placeholder location="classpath:jdbc.properties" system-properties-mode="NEVER"/>

问题解决。