Spring配置jdbc.properties时数据库用户名设置名称要注意

spring版本4.3.2，配置DataSource连接Oracle时出现一个奇怪的现象，用下面的配置方法可以直接连接数据库，对数据库进行操作，说明这些属性值没有问题。

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
  <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
  <property name="url" value="jdbc:oracle:thin:@192.168.32.128:1521:XXXX" />
  <property name="username" value="scott" />
  <property name="password" value="123456" />
 </bean>

然后用加载jdbc.properties属性文件的方式，同样的属性值会报如下的错误

================================================================================================

<context:property-placeholder location="classpath:jdbc.properties"/>

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
  <property name="driverClassName" value="${driverClassName}" />
  <property name="url" value="${url}" />
  <property name="username" value="${username}" />
  <property name="password" value="${password}" />
 </bean>

=================================================================================================

jdbc.properties文件如下

driverClassName=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@192.168.32.128:1521:XXXX
username=scott
password=123456

=================================================================================================

报错信息

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create PoolableConnectionFactory (ORA-01017: invalid username/password; logon denied)

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最后发现了，因为自己想偷下懒，想少敲几个字母的缘故。

在jdbc.properties中username一定不要写成username，写成jdbc.username或者username1都行，总之要和username区分开，然后就可以愉快地连接数据库了。

password可以是password，但username不能是username。