在beans.xml中加入两个必须的bean

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<bean id="propertyConfigurer" 
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
 
    <property name="location" value="/WEB-INF/jdbc.properties" /> 
 
</bean> 
 
 
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
    destroy-method="close"> 
    <property name="driverClassName" value="${jdbc.driverClassName}" /> 
    <property name="url" value="${jdbc.url}" /> 
    <property name="username" value="${jdbc.username}" /> 
    <property name="password" value="${jdbc.password}" /> 
 
</bean>

在web-inf下面的jdbc.properties

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jdbc.driverClassName=com.mysql.jdbc.Driver 
jdbc.url=jdbc:mysql://210.30.12.3:3306/spring 
jdbc.username=root 
jdbc.password=sa