spring用druid做连接池一直出现异常

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druid做连接池出现异常Caused by: java.sql.SQLException: Access denied for user ‘Gude’@’localhost’ (using password: YES)

查了资料(感谢这里的到大神)终于明白

感觉很奇怪,我明明配置的名称的root竟然会变成Gude(我的电脑名),原来我在properties的数据库名称用了username，spring引进来就为${username},我数据库配置(db.properties) 用的 <context:property-placeholder>而system-properties-mode没有设置用了默认的”environment”，改成”fallback”即可.system-properties-mode,默认是environment,就是先找系统属性,再找location文件里面的属性.这里他优先找到系统的username(ps:我的电脑名称是Gude)这也就解释了为什么连接数据库变成了电脑名

system-properties-mode属性：

  • ENVIRONMENT -indicates placeholders should be resolved against the current Environment and against any local properties;(优先系统属性和任何本地属性)
  • NEVER -indicates placeholders should be resolved only against local properties and never against system properties;(只使用本地配置文件)
  • FALLBACK -indicates placeholders should be resolved against any local properties and then against system properties;(先本地配置文件再系统属性)
  • OVERRIDE -indicates placeholders should be resolved first against system properties and then against any local properties;(先系统属性再本地配置文件)

解决

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<context:property-placeholder location="classpath*:jdbc.properties" system-properties-mode="FALLBACK"/>

另外的方法导入配置文件

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<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location" value="classpath:jdbc.properties" />
		<property name="systemPropertiesMode" value="1"/>
</bean>

这种方法导入配置文件不会有上面的问题 从官方文档可以看出他只有3种模式 默认是FALLBACK(即值为1)

  • 3种模式对应的值