直接配置数据库信息

• 配置德鲁伊连接池

• 引入德鲁伊连接池依赖jar包
  

<?xml version="1.0" encoding="UTF-8"?>   
<beans xmlns="http://www.springframework.org/schema/beans"   
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">   
   <!--直接配置连接池-->   
   <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">   
      <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>   
      <property name="url" value="jdbc:mysql://localhost:3306/userDb"></property>   
      <property name="username" value="root"></property>   
      <property name="password" value="root"></property>   
   </bean>   
</beans> 

引入外部属性文件配置数据库连接池

• 创建外部属性文件，properties格式文件，写数据库信息

  prop.driverClass=com.mysql.jdbc.Driver
  prop.url=jdbc:mysql://localhost:3306/userDb
  prop.userName=rootprop.password=root
  

• 把外部properties属性文件引入到spring配置文件中

  引入context名称空间

  <?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">   
  </beans>  
  

在 spring 配置文件使用标签引入外部属性文件

<?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:p="http://www.springframework.org/schema/p"   
       xmlns:util="http://www.springframework.org/schema/util"   
       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/util http://www.springframework.org/schema/util/spring-util.xsd   
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">   
   
    <!--直接配置连接池-->   
    <!--<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">   
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>   
        <property name="url" value="jdbc:mysql://localhost:3306/userDb"></property>   
        <property name="username" value="root"></property>   
        <property name="password" value="root"></property>   
    </bean>-->   
   
    <!--引入外部属性文件-->   
    <context:property-placeholder location="classpath:jdbc.properties"/>   
   
    <!--配置连接池-->   
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">   
        <property name="driverClassName" value="${prop.driverClass}"></property>   
        <property name="url" value="${prop.url}"></property>   
        <property name="username" value="${prop.userName}"></property>   
        <property name="password" value="${prop.password}"></property>   
    </bean>   
   
</beans>